JP5553679B2 - Dental technician working model - Google Patents

Description

  The present invention relates to a dental technician work model used when producing a dental prosthesis or the like.

The present inventor has developed a plastic base shown in FIG. 1 in order to efficiently produce a work model. (See Patent Document 1)
In the working model of FIG. 1, a fixing plate 92 for fixing a patient's tooth model 94 is connected to a base 91 on the upper surface. In order to connect the fixed plate 92 to a fixed position of the base 91, dowel pins 93 are fixed to the lower surface of the fixed plate 92. The base 91 is made of plastic, and is provided with a connecting hole 95 into which the dowel pin 93 can be inserted and removed. The working model of FIG. 1 can be connected to a fixed position of the base 91 by inserting the dowel pins 93 of the fixed plate 92 into the connection holes 95 of the base 91.

JP 2009-100080 A

  1, the tooth model 94 is fixed to the upper surface of the fixing plate 92, and the tooth model 94 is cut at a position indicated by a broken line at the boundary of the tooth model 94A and fixed to the tooth model 94 as shown in FIG. The plate 92 is cut together with a saw to form a divided model 80. The divided model 80 is connected to the base 91 through the dowel pins 93 in a state where it can be detached and attached independently. While removing the divided model 80 from the base 91, the crown prosthesis 81 and the denture having the optimum shape for the patient are manufactured.

  As described above, when the tooth model 94 and the fixed plate 92 are cut together with a saw to form the divided model 80, a part of the base 91 is also cut together as shown by the broken line in FIG. This is because the divided model 80 is surely separated and detached from the base 92. If the tooth model 94 and the fixed plate 92 are cut with a saw so as not to cut the base 91, the fixed plate 92 cannot be completely separated at the boundary with the base 91. In order to avoid this adverse effect, the upper surface of the base 91 and the contact surface with the fixed plate 92 are cut together with the base 91 with a saw.

  However, the plastic base 91 has a drawback that it cannot be cut smoothly with a saw together with the fixed plate 92. When the plastic base 91 is cut with a saw, the saw does not move smoothly and cannot be reciprocated smoothly, and the cut plastic is clogged and cannot be cut efficiently. There is a drawback that can not be easily cut with a saw. For this reason, the upper surface of the base 91 cannot be cut easily and easily together with the fixed plate 92, and there is a drawback that it takes time and effort to reliably separate the divided model 80.

  By manufacturing the base with plaster as in the past, the base can be cut easily and easily together with the fixed plate. However, the gypsum base cannot be directly connected to the articulator. It must be fixed by adhering it to a plastic or metal base, and this base must be connected to the articulator. There was a drawback that it took time to connect. It is necessary to connect the base to the articulator in order to adjust the meshing with the opposing teeth in the process of manufacturing the denture on the divided model. This is because a denture is manufactured by attaching and detaching the divided model to the base while adjusting the meshing with the opposing teeth with the articulator. Therefore, the conventional working model has a drawback that if the base is made of plastic, it takes time to separate the fixing plate with a saw, and if the base is made of plaster, it takes time to connect the articulator.

  The present invention has been developed for the purpose of solving the above-mentioned drawbacks. An important object of the present invention is to provide a dental technician working model capable of securely cutting a fixing plate with a saw while realizing a strength that can be easily connected to an articulator.

Means for Solving the Problems and Effects of the Invention

  The dental technician work model of the present invention includes a fixed plate 2 to which a tooth model 4 is fixed, a plurality of dowel pins 3 having one end connected to the fixed plate 2, and a detachable connection through the dowel pins 3. The plastic base 1 is provided. The fixing plate 2 fixes the dowel pins 3 at a predetermined interval along the longitudinal direction. The base 1 is provided with a connecting hole 5 through which a dowel pin 3 fixed to the fixing plate 2 can be inserted and removed. In the dental technician work model, the dowel pin 3 is inserted into the connecting hole 5 and the fixing plate 2 is connected to a fixed position of the base 1. Furthermore, in the dental technician work model, the base 1 is formed by mixing powder of 5 wt% or more and 70 wt% or less.

The above working model for dental technicians has a feature that the fixing plate can be surely separated with a saw while realizing a strength that can be easily connected to an articulator. This is because the base is formed by mixing a considerable amount of powder. Plastics are mixed wood waste is easily cut with a saw by powder, in particular, by increasing the filling amount of the powder is more smoothly cut with a saw. Chips generated by cutting the base with a saw are not clogged by the saw and are separated and smoothly discharged. A base formed by filling a plastic with a powder such as wood chips can be made into a state in which the physical properties of the plastic are easily cut by the added powder, and can be cut easily and smoothly with a saw.

Dental working model of the present invention, the powder comprises wood chips.
Foundation for a powder and wood chips without damaging the saw blade in powder is filled into plastic, simply and easily, moreover Ru feature there that can be cut smoothly. Et al is, base for powder and wood chips are also features that can prevent the escape is a dowel pin that connects to the fixed plate. This is because the frictional resistance of the base surface can be made larger than that of plastic by filling these powders. When machining the split model by connecting the working model to the articulator, if the split model is an upper tooth, there is a drawback that the dowel pin falls off the base under its own weight and falls. The work model that can prevent the dowel pin from falling out does not have this defect, and the divided model can be connected to the base so that it does not come off under its own weight, and work can be done efficiently.

In the dental technician work model of the present invention, the base 1 can be provided with a stepped convex portion 14 having the same outer shape as the fixed plate 2 on the upper surface.
Since this dental technician work model has a desorption projection with the same outer shape as the fixed plate, the fixed plate and desorption projection are cut together and fixed without cutting the entire upper surface of the base with a saw. There is a feature that the plate can be surely cut into a split model.

In the dental technician work model of the present invention, the fixing plate 2 can be made of plastic obtained by mixing gypsum or powder.
This dental technician work model is characterized in that the fixed plate is made of plastic mixed with gypsum and powder, so that the fixed plate can be easily separated into a divided model.

It is a disassembled perspective view of the working model for dental technicians which the inventor developed previously. It is a vertical longitudinal cross-sectional view of the working model for dental technicians concerning one Example of this invention. It is the III-III sectional view taken on the line of the working model for dental technicians shown in FIG. FIG. 3 is an exploded perspective view of the dental technician work model shown in FIG. 2. It is the disassembled perspective view which looked at the working model for dental technicians shown in FIG. 4 from the lower side. It is a disassembled perspective view which shows the state which removes a division | segmentation model from the working model for dental technicians shown in FIG. It is a disassembled sectional view which shows the state which removes a division | segmentation model from the working model for dental technicians shown in FIG. It is a perspective view which shows another example of a foundation. It is a perspective view which shows another example of a foundation. It is a perspective view which shows an example which manufactures a fixed plate. It is a side view which shows an example which fixes a tooth profile model to a fixing plate. It is a side view which shows another example which fixes a tooth profile model to a fixing plate. It is a side view which shows another example which fixes a tooth profile model to a fixing plate. FIG. 16 is a vertical cross-sectional view of a dental technician work model according to another embodiment of the present invention, corresponding to a cross section taken along line XIV-XIV in FIG. 15. It is a disassembled perspective view of the working model for dental technicians shown in FIG. FIG. 16 is a rear perspective view of the base shown in FIG. 15. It is a side view which shows an example which fixes a tooth profile model to a fixing plate. It is a side view which shows another example which fixes a tooth profile model to a fixing plate.

  Embodiments of the present invention will be described below with reference to the drawings. However, the Example shown below illustrates the dental technician work model for embodying the technical idea of the present invention, and the present invention does not specify the dental technician work model as follows.

  Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  2 to 7 includes a fixed plate 2 to which a tooth model 4 is fixed on an upper surface, a plurality of dowel pins 3 having one end connected to the fixed plate 2, and the dowel pins 3 And a plastic base 1 that is detachably connected to each other.

  The tooth model 4 is fixed to the surface of the fixing plate 2 by bonding. In the illustrated dental technician work model 100, the planar shape of the fixing plate 2 and the base 1 is elongated so that the elongated tooth model 4 can be fixed. As shown by the broken line in FIG. 2, the tooth model 4 having a plurality of tooth models 4 </ b> A is cut at the cutting lines 23 on both sides of the dental prosthesis 21 at the boundary of the tooth model 4 </ b> A to form the divided model 20. . The fixed plate 2 for fixing the tooth model 4 is connected to the base 1 via a plurality of dowel pins 3 so that the cut divided model 20 can be connected to the base 1 independently. Therefore, the tooth model 4 is bonded and fixed to the fixing plate 2 so that the dowel pin 3 is arranged at the center of the divided model 20. In a state where the tooth model 4 is fixed, the fixing plate 2 and the tooth model 4 are cut to form a divided model 20.

  The base 1 is formed entirely of plastic. The plastic of the base 1 is formed by mixing 30% by weight of powder. The plastic is a polyethylene resin. However, other thermoplastic resins such as polypropylene resin, polyvinyl chloride resin, nylon resin, polystyrene resin, and urethane resin can be used as the base plastic. The powder filling the plastic is 5% by weight or more and 70% by weight or less, preferably 10% by weight or more and 50% by weight or less, more preferably 20% by weight or more and 40% by weight or less. Can do. Increasing the filling amount of the powder can make the cutting with a saw smoother, but the strength decreases. On the other hand, if the powder filling amount is reduced, the strength is improved, but it is impossible to cut smoothly with a saw. Therefore, the filling amount of the powder is set to the above-described range so that the strength required for the foundation is realized and the powder can be cut smoothly with a saw.

  The powder mixed with the plastic of the base 1 preferably has an average particle size of 10 μm to 500 μm, preferably 10 μm to 100 μm. When the average particle size of the powder is reduced, the foundation can be molded with high accuracy, but the production cost of the powder is increased. On the other hand, if the average particle size of the powder is increased, the processing cost of the powder is reduced, but the molding accuracy of the base is lowered. By setting the average particle size of the powder to 10 μm to 500 μm, the powder can be manufactured at low cost while increasing the molding accuracy of the foundation.

Wood dust is the best powder. The plastic base 1 filled with wood chips can be formed with high accuracy while being cut very smoothly with a saw. However, the powder to be filled into the base, forming a powder of the stone material to wood chips, gypsum powder, inorganic powder powder such as calcium carbonate, the foundation is filled further by mixing flour powder of organic, such as coconut shells powder plastic You can also.

  As shown in the cross-sectional views of FIGS. 2 and 3, the plastic base 1 is formed into a shape in which a peripheral wall 11 is connected around an upper surface plate 10 that connects the fixed plate 2. As shown in FIG. 4, the base 1 is provided with a connecting hole 5 in the center of the base 1 in which a dowel pin 3 can be inserted and removed with a predetermined distance in the longitudinal direction. The base 1 shown in the figure is provided with a connecting hole 5 for connecting two dowel pins 3 at regular intervals to an elongated upper plate 10. The base shown in FIG. 4 is provided with ten connecting holes 5 at predetermined intervals so that two dowel pins 3 arranged in five rows can be connected.

  Furthermore, the base 1 is provided with a fitting protrusion 6 that connects the fixed plate 2 to a fixed position on the surface of the upper plate 10, that is, the surface facing the fixed plate 2. The fitting protrusions 6 are convex and are provided so as to extend in the longitudinal direction of the upper surface plate 10 along both sides of the connection hole 5. The fitting protrusion 6 is fitted into a fitting recess 7 provided in the fixed plate 2 to place the fixed plate 2 at a fixed position. The base 1 shown in FIG. 4 has one fitting protrusion 6 in a straight line and the other fitting protrusion 6 in a curved line. In this way, the base 1 having the two opposing mating protrusions 6 having different shapes is characterized in that it can be connected in the correct direction while specifying the orientation of the fixed plate 2 connected to the upper surface plate 10. However, the two fitting protrusions facing each other may have the same shape.

  Further, the base 1 shown in the figure has a positioning convex portion 8 on the surface of the central portion of one end portion of the top plate 10. This positioning convex part 8 is guided by the positioning concave part 9 provided in the fixed plate 2, and connects the fixed plate 2 while specifying the correct direction. The positioning convex part 8 has a curved surface with a central convex so that the positioning convex part 8 can be smoothly inserted into the positioning concave part 9 provided in the fixed plate 2.

  In the base 1, the dowel pin 3 is inserted into the connection hole 5, the two fitting protrusions 6 are inserted into the fitting recesses 7 of the fixing plate 2, and the positioning protrusions 8 are inserted into the positioning recesses 9. It is guided and connected so that the fixing plate 2 can be removed.

  The connecting hole 5 has a shape in which the dowel pins 3 can be inserted without any gap, and is provided at a position where each dowel pin 3 can be inserted. Since the dowel pin 3 is fixed in a posture orthogonal to the fixing plate 2, the connecting hole 5 is provided in the base 1 orthogonal to the upper surface plate 10. As shown in the exploded perspective view seen from the bottom surface of FIG. 5, the base 1 is formed by integrally forming a cylindrical body 12 so as to protrude from the inner surface of the top plate 10, and 2 inside the cylindrical body 12. The book connecting holes 5 are provided side by side. Therefore, the base 1 is provided with the cylindrical body 12 protruding from the portion where the connection hole 5 is provided. The cylindrical body 12 is connected to a reinforcing rib 13 formed integrally with the base 1 and is reinforced by the reinforcing rib 13. In the illustrated base 1, the cylindrical body 12 is connected to the inner surface of the peripheral wall 11 by the lateral reinforcing ribs 13 </ b> A, and the adjacent cylindrical bodies 12 are connected by the vertical reinforcing ribs 13 </ b> B. The base 1 is connected to the top plate 10 so as not to deform the cylindrical body 12. Therefore, the dowel pin 3 inserted into the connecting hole 5 of the cylindrical body 12 is firmly connected in place.

  Further, as shown in FIGS. 2, 3, and 7, the connecting hole 5 penetrates the cylindrical body 12 up and down and opens both ends. Since the connecting hole 5 can be discharged even if dust or the like enters the inside, it can be reliably prevented that the dust or the like that has entered the inside cannot be removed. Further, the base 1 in the figure is connected in a state in which the total length of the dowel pins 3 is longer than the total length of the connection holes 5 so that the tip of the dowel pins 3 to be inserted protrudes from the opening at the lower end. The dowel pin 3, whose tip protrudes from the lower end of the connection hole 5, also has a feature that it can be easily removed from the connection hole 5 by pushing up the protruding portion from below.

  The connecting hole 5 has an inner shape that conforms to the outer shape of the dowel pin 3. Since the dowel pin 3 in the figure has a tapered taper shape that gradually decreases toward the tip, the connecting hole 5 in the figure is formed in a tapered shape. The connecting hole 5 having this shape can be smoothly inserted and removed while the dowel pin 3 is in close contact with the inner surface of the connecting hole 5.

  Further, the base 1 of FIG. 4 is provided with a stepped convex portion 14 having the same outer shape as the fixed plate 2 at the center of the upper surface, and the fitting projected portion 6 and the positioning convex portion 8 are provided on the stepped convex portion 14. . The base 1 having this structure can more easily cut the fixing plate 2 between the tooth models 4A. This is because the step protrusion 14 protruding from the upper surface of the base 1 can be cut in the same manner as a part of the lower portion of the fixed plate 2. Therefore, the step protrusion 14 is preferably formed in an outer shape equal to the outer shape of the fixed plate 2. However, the outer shape of the stepped convex portion may be larger or smaller than the outer shape of the fixed plate, or may be a different shape.

  Further, the base 1 in FIG. 4 is provided with a pin mark 15 indicating the position of the dowel pin 3 on the outer peripheral edge of the upper surface and outside the stepped protrusion 14. The pin mark 15 shown in the figure is a recess formed by cutting out the outer peripheral edge of the upper surface. The base 1 shown in the figure is provided with pin marks 15 at opposite positions on both side edges. Further, the pin mark 15 is provided on the outer side of the stepped convex portion 14 and provided at a boundary portion with the fixed plate 2. Since the base 1 shown in the figure has a plurality of dowel pins 3 arranged in five rows, five pin marks 15 are provided on both sides of the stepped protrusion 14. In the illustrated base 1, a concave portion is formed to form a pin mark 15, but the pin mark may be a convex portion, a convex line, or a groove.

  Further, the base 1 of FIG. 4 is provided with positioning marks 17 between adjacent pin marks 15 on both opposing side surfaces. The base 1 shown in the figure is provided with a positioning mark 17 located at the center of the adjacent pin mark 15. These positioning marks 17 are provided to accurately position the tooth model 4 when the tooth model 4 is fixed on the fixing plate 2. The positioning mark 17 is a ridge extending in the direction of the dowel pin 3 and is integrally formed in the process of molding the plastic base 1. In the positioning mark 17 shown in the drawing, the cross-sectional shape of the ridge is a semi-circular shape with a central protrusion. However, the positioning mark can also make the cross-sectional shape of a protrusion into a semi-elliptical shape or a polygonal shape. The base 1 in FIG. 4 is provided with a convex line of the positioning mark 17 so as to extend in the direction of the dowel pin 3 from the boundary surface (upper part in the drawing) with the fixed plate 2. The base 1 in the figure is provided with a ridge having a length that is approximately ½ of the total height, and is used as a positioning mark 17. The ridge positioning mark 17 is provided on the side surface of the base 1 so as to have a length equal to 1/4 of the height of the entire base or equal to the height of the entire base. Further, the height and width of the ridge of the positioning mark 17 is preferably about 1 mm, but may be 0.5 mm to 3 mm. The protrusion positioning mark can be made higher to make it difficult to slip when gripping the base 1.

  Since the base 1 shown in the figure is provided with five pin marks 15 on each side, four positioning marks 17 are provided on the peripheral walls 11 on both sides at the center of the adjacent pin marks 15. ing. However, the number of pin marks and positioning marks provided on the base can be variously changed according to the total length of the base and the number of dowel pins connected to the base.

  Further, as shown in FIGS. 8 and 9, the base 1 can be provided with a plurality of positioning marks 17 between adjacent pin marks 15. The base 1 shown in FIG. 8 is provided with two rows of positioning marks 17 between adjacent pin marks 15. Two rows of positioning marks 17 provided between adjacent pin marks 15 are provided so as to be symmetrical with respect to the pin marks 15. The base 1 accurately positions the tooth model 4 fixed to the fixing plate 2 with the positioning marks 17 arranged in two rows on both sides of the pin mark 15.

  Furthermore, the base 1 shown in FIG. 9 is provided with three rows of positioning marks 17 between adjacent pin marks 15. The three rows of positioning marks 17 are composed of a main positioning mark 17A provided in the middle of the adjacent pin marks 15 and sub positioning marks 17B provided on both sides of the main positioning mark 17A. The sub positioning mark 17B shown in the figure is in a posture parallel to the main positioning mark 17A. The base 1 can distinguish between the main positioning mark 17A and the sub positioning mark 17B by changing the length, width, height, and the upper and lower positions of the positioning mark 17 that is a ridge. it can. The base 1 shown in the figure is provided with a main positioning mark 17A extending from the boundary surface with the fixed plate 2 in the direction of the dowel pin 3, and its length is about ½ of the height of the entire base. It is said. Further, the sub positioning marks 17B provided on both sides of the main positioning mark 17A are provided at the lower part of the base 1 with their upper end positions positioned below the upper end position of the main positioning mark 17A. The length is about 2/3 of the height of the entire foundation. Further, the sub positioning mark 17B shown in the figure has a quadrilateral cross-sectional shape of the ridge, and its width and height are smaller than those of the main positioning mark 17A. The base 1 positions the tooth model 4 fixed to the fixing plate 2 with the main positioning marks 17A provided on both sides of the pin mark 15, and further, the portion serving as the divided model is further sub-positioned mark 17B. Can be positioned more accurately.

  Furthermore, the base having a positioning mark composed of a main positioning mark and a sub positioning mark can position the tooth model fixed to the fixed plate with the main positioning mark. The interval, direction, and shape thereof can be variously changed. For example, the sub positioning mark can be provided at the position of the pin mark, or can be in a posture inclined with respect to the main positioning mark.

  As described above, the base 1 provided with a plurality of positioning marks 17 between the adjacent pin marks 15 can improve the anti-slip effect of the base 1 by increasing the number of positioning marks 17. In particular, the base 1 shown in FIG. 9 has different shapes for the main positioning mark 17A and the sub positioning mark 17B, so that the feeling of fitting to the fingertips is different, and the side surface of the base 1 is wider. By providing the positioning mark 17 in the region, the anti-slip effect of the base 1 can be further improved.

  The fixing plate 2 is entirely made of gypsum, and the dowel pin 3 is fixed at a specific predetermined position. However, the fixed plate can be formed entirely of plastic filled with powder in the same manner as the base. A fixed plate made of plastic filled with powder can be easily cut when producing a divided model while improving dimensional accuracy and strength. The fixed plate 2 in the figure has a flat upper surface, and a tooth model 4 is fixed to this surface. The fixed plate 2 shown in the figure has a plate shape having a predetermined thickness and has an outer shape substantially equal to the stepped convex portion 14 of the base 1.

  As shown in FIG. 5, the fixing plate 2 fixes a plurality of dowel pins 3 at a central portion thereof while being separated by a predetermined distance along the longitudinal direction. The fixed plate 2 shown in the figure has ten dowel pins 3 arranged in five rows of two, and fixed at regular intervals.

  Further, as shown in FIG. 5, the fixing plate 2 is provided with a fitting recess 7 into which the fitting protrusion 6 of the base 1 is fitted on the lower surface of the fixing plate 2 facing the base 1. The fitting recess 7 shown in the figure is a vertical groove that guides the fitting protrusion 6 that is a ridge, and is provided at a position facing the fitting protrusion 6 so that the fitting protrusion 6 can be inserted. The fitting recess 7 shown in the figure is provided so as to extend in the longitudinal direction of the fixed plate 2 along both sides of the connecting hole 5. Since the base 1 shown in the figure has one fitting protrusion 6 in a straight line and the other fitting protrusion 6 in a curved line shape, a groove-like fitting recess for guiding these fitting protrusions 6. 7, one is linear and the other is curved.

  Further, the fixed plate 2 of FIG. 5 is provided with a positioning concave portion 9 that guides the positioning convex portion 8 provided on the upper surface plate 10 at one end portion and on the surface facing the base 1. The positioning recess 9 has a shape into which the positioning protrusion 8 provided on the top plate 10 can be fitted. The positioning concave portion 9 in the figure has a central concave shape so that the central convex positioning convex portion 8 can be inserted.

  The above fixing plate 2 has the fitting protrusions 6 inserted into the fitting recesses 7 and the positioning protrusions 8 inserted into the positioning recesses 9 in a state where each dowel pin 3 is inserted into the connecting hole 5. The base 1 is connected so as to be removable. In particular, the structure in which the fitting protrusion 6 and the fitting recess 7 are provided apart from the side edge of the opposing surface allows the outer peripheral surface of the fitting protrusion 6 to be in close contact with the inner peripheral surface of the fitting recess 7 to be firmly connected. .

  The dowel pin 3 is in a posture orthogonal to the fixed plate 2 and has an upper end fixed to the fixed plate 2. Each of the dowel pins 3 is fixed to the fixed plate 2 at a predetermined interval and in a posture parallel to each other. As shown in FIG. 2 and FIG. 3, the dowel pin 3 has its upper end embedded in the fixed plate 2 and fixed in a state where the pin body protrudes from the lower surface of the fixed plate 2. As shown in FIGS. 2 and 3, the dowel pin 3 embedded in the fixed plate 2 is provided with a flange 16 at the upper end. The dowel pin 3 is fixed to the fixing plate 2 with a structure in which the flange 16 is embedded in the fixing plate 2 so as not to come off.

  The dowel pin 3 is a metal pin. However, the dowel pin may be a plastic pin formed by molding plastic into a predetermined shape. Further, the dowel pin 3 has a tapered shape with a tapered tip so that the dowel pin 3 can be smoothly inserted into the connecting hole 5. Further, the dowel pin may have a non-circular cross-sectional shape.

  The fixing plate 2 for fixing the dowel pin 3 in a predetermined position is not shown, but a mold formed by fixing the dowel pin in a predetermined position is filled with gypsum or plastic, and the dowel pin is buried in gypsum or plastic. Produced. However, the fixed plate can also be manufactured by using the base together with the molding die. In this method, for example, as shown in FIG. 10, gypsum or plastic for forming the fixing plate 2 is filled and molded along the outer peripheral edge of the stepped convex portion 14 of the base 1 in which the dowel pins 3 are inserted into the connecting holes 5. This can be realized by providing a molding peripheral wall 19 for the purpose. The molding peripheral wall 19 can be provided by adhering a cylindrical sheet material along the outer peripheral surface of the stepped convex portion 14 of the base 1, or can be provided by integrally molding a base molding plastic. You can also. The molding peripheral wall connected to the step convex portion of the base can be provided with a separation portion at the boundary with the step convex portion, and the fixed plate can be removed after molding.

  In the dental technician work model 100 having the above structure, the dowel pin 3 of the fixing plate 2 is inserted into the connecting hole 5 of the base 1, and the fitting protrusion 6 of the base 1 is inserted into the fitting recess 7 of the fixing plate 2. Further, the positioning convex portion 8 of the base 1 is guided to the positioning concave portion 9 of the fixed plate 2 to connect the fixed plate 2 to a fixed position of the base 1. That is, the dental technician work model 100 shown in the figure has a connecting structure of dowel pins 3 and connecting holes 5 arranged in a plurality of rows, and fitting protrusions 6 provided on the opposing surfaces of the base 1 and the fixing plate 2. With the synergistic effect of the fitting structure of the fitting recess 7 and the connecting structure of the positioning protrusion 8 and the positioning recess 9, the fixing plate 2 and the base 1 are smoothly guided while the fixing plate 2 is smoothly guided to the fixed position of the base 1. Can be firmly connected to the correct position. However, the dental technician work model does not necessarily need to be provided with positioning convex portions and positioning concave portions on the opposing surfaces of the base and the fixing plate.

  Further, the dental technician work model 100 fixes the tooth model 4 to the upper surface of the fixing plate 2 connected to the base 1 while positioning the tooth model 4. For example, the tooth model 4 is positioned so that the position of the cutting line 23 that cuts the divided model 20 is symmetrical with respect to the opposing positioning mark 17. Since the tooth profile model 4 shown in FIG. 11 includes a single crown prosthesis 21 (indicated by cross hatching in the figure), the divided model 20 to which the crown prosthesis 21 is connected has one row. Dowel pins 3 are arranged. Therefore, this tooth model 4 has two positioning marks 17 (arrows A in the figure) in which the cutting lines 23 on both sides of the crown prosthesis 21 are located on both sides of the dowel pin 3 arranged just below the crown prosthesis 21. It is fixed to the fixing plate 2 while being positioned so as to be symmetrical with respect to the display. In this way, in the tooth profile model 4 fixed to the fixing plate 2, one row of dowel pins 3 is arranged at the center of the divided model 20 cut along the cutting lines 23 on both sides of the crown prosthesis 21.

  Further, FIG. 12 shows an example of fixing the tooth profile model 4 including the crown prosthesis 21 (shown by cross-hatching in the figure) to the fixing plate 2 while positioning it. The crown prosthesis 21 in this figure connects three dentures 24 to form a single crown prosthesis 21, and the divided model 20 to which the crown prosthesis 21 is connected has three rows of dowel pins 3. Is arranged. Therefore, the tooth model 4 has two positioning marks 17 (FIG. 2) in which the cutting lines 23 on both sides of the crown prosthesis 21 are located on both sides of the three rows of dowel pins 3 arranged immediately below the crown prosthesis 21. And is fixed to the fixing plate 2 while being positioned so as to be symmetrical with respect to two positioning marks 17 (indicated by an arrow C in the figure) positioned in the middle. In this way, in the tooth profile model 4 fixed to the fixed plate 2, three rows of dowel pins 3 are arranged on the divided model 20 separated by the cutting line 23. At this time, the three rows of dowel pins 3 are not arranged directly under the three dentures 24 but are equally arranged on the crown prosthesis 21 of the continuous crown composed of the three dentures 24.

  However, as shown in FIG. 13, the divided model 20 to which the crown prosthesis 21 having the continuous crown composed of the three dentures 24 is connected can also be arranged with two rows of dowel pins 3. In this case, the tooth profile model 4 has two positioning marks 17 (FIG. 2) in which the cutting lines 23 on both sides of the crown prosthesis 21 are located on both sides of the two rows of dowel pins 3 arranged immediately below the crown prosthesis 21. And is fixed to the fixed plate 2 while being positioned so as to be symmetrical with respect to one positioning mark 17 (indicated by an arrow E in the figure) located in the middle. In this way, the tooth profile model 4 fixed to the fixed plate 2 has the two rows of dowel pins 3 arranged on the divided model 20 separated by the cutting line 23. At this time, the two rows of the dowel pins 3 are located at the center of the continuous crown prosthesis 21 including the three dentures 24 and are evenly arranged.

  Further, as shown in FIG. 8, the base 1 having two positioning marks 17 between the adjacent pin marks 15 can select the positioning marks 17 in accordance with the interval between the cutting lines separating the divided models. . For example, in the case of positioning a tooth model that is a small divided model and has a narrow interval between cutting lines to be cut, the cutting lines on both sides of the prosthesis are positioned on the positioning marks 17 located on both sides of the pin mark 15. Then, the positioning mark 17 is fixed while being positioned so as to be symmetrical with respect to the positioning mark 17 on the side close to the pin park 15. On the other hand, when positioning a tooth model that is a large divided model and has a wide interval between cutting lines to be cut, the cutting lines on both sides of the dental prosthesis are positioned among the positioning marks located on both sides of the pin mark. The positioning mark 17 is fixed while being positioned so as to be symmetrical with respect to the positioning mark 17 on the side away from the pin park.

  Further, as shown in FIG. 9, the base 1 having the main positioning mark 17A and the sub-position mark 17B between the adjacent pin marks 15 specifies the position of the cutting line for separating the divided model by the main positioning mark 17A. However, the sub-positioning mark 17B can be used for finer positioning. For example, in the case of positioning a tooth model having a small divided model and having a narrow interval between cutting lines to be separated, the sub positioning mark closer to the pin park 15 than the main positioning mark 17A, that is, the inner side of the main positioning mark 17A. In the case of positioning a tooth model having a large divided model and having a large interval between cutting lines to be separated, the positioning is performed with respect to the sub positioning mark 17B outside the main positioning mark 17A. can do.

  As described above, the dental technician work model of the present invention can accurately fix the tooth model 4 to the optimum position of the fixing plate 2 while positioning with the positioning mark 17 provided on the side surface of the base 1, and the cutting line. The dowel pins 3 arranged on the divided model 20 separated at 23 can be arranged at ideal positions.

  The dental technician work model of the above embodiment shows a partial dental technician work model. In particular, the dental technician work model shown in the figure is a dental technician work model of the molar portion. Therefore, the dental technician working model of these molar portions has the base 1, the fixing plate 2 and the tooth profile model 4 in a shape along the molar portion. However, the dental technician working model for the portion may be a dental technician working model for the front tooth portion. The dental technician working model for the front tooth part is manufactured as a shape along the front tooth part, although the base, the fixing plate and the tooth model are not shown.

  Furthermore, the dental technician work model of the present invention may be a full jaw dental technician work model. A working model for a dental technician for the entire jaw is manufactured by forming a base, a fixed plate, and a tooth model along the entire jaw. An example of the dental jaw work model is shown in FIG. 14 and FIG. 15, and a rear perspective view of the base of the dental technician work model is shown in FIG. The entire jaw base 1 shown in these figures has a horseshoe shape as a whole, and a horseshoe-shaped fixing plate 2 along the base 1 is detachably connected to the upper surface thereof. The jaw plate 4 is fixed to the fixed plate 2. In these drawings, the same components as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The whole jaw base 1 shown in FIG. 15 and FIG. 16 is molded of plastic into a shape formed by connecting a peripheral wall 11 around a horseshoe-shaped top plate 10 for connecting a fixed plate 2. In the illustrated base 1, the curved inner peripheral wall 11 is connected by a semi-elliptical connection plate 18. Further, the horseshoe-shaped base 1 protrudes from the top plate 10 and is provided with a stepped protrusion 14 having the same outer shape as the fixed plate 2. The base 1 connects the fixed plate 2 with the upper surface of the stepped convex portion 14 as the surface facing the fixed plate 2. The base 1 is provided with a connecting hole 5 in which a dowel pin 3 can be inserted / removed at a central portion along the longitudinal direction of the stepped convex portion 14 that is curved. The base shown in the drawing is provided with a plurality of connecting holes 5 at predetermined intervals so that two dowel pins 3 arranged in a plurality of rows can be connected. The base 1 shown in the figure gradually increases the interval between the plurality of connecting holes 5 from the front tooth portion toward the molar portion. Furthermore, the base 1 shown in the figure equalizes the opening areas of the plurality of connection holes 5 arranged along the outer side of the curved upper surface plate 10 and also has a plurality of connection holes arranged along the inner side of the upper surface plate 10. The opening area of 5 is gradually reduced from the molar portion toward the front tooth portion. Although not shown, the base 1 is firmly connected to the base 1 with a plurality of dowel pins 3 fixed to the base plate 2 at intervals and shapes facing a plurality of connection holes 5 provided in the base 1. it can. However, all of the plurality of dowel pins may have the same thickness, and all the connection holes provided in the base may have the same opening area.

  Furthermore, the base 1 shown in FIGS. 14 to 16 is provided with fitting protrusions 6 along both sides of the curved stepped protrusion 14, that is, along the inner edge and the outer edge. The fitting protrusions 6 are curved ridges, are located on both sides of the connecting hole 5 and are provided inward from the side edge of the step protrusion 14. The fitting protrusion 6 is fitted into a fitting recess 7 provided in the fixed plate 2 to place the fixed plate 2 at a fixed position.

  Further, the base 1 shown in the drawing is provided with pin marks 15 indicating the positions of the dowel pins 3 at the outer and inner peripheral edge portions of the upper surface and at the opposing positions on the outer side and the inner side of the curved stepped convex portion 14. In the base 1 shown in the figure, the pin mark 15 provided on the outer side of the step convex portion 14 is formed as a concave portion with the outer peripheral edge of the upper surface cut out, and the pin mark 15 provided on the inner side of the step convex portion 14 has a different size. It is a convex part. The base 1 shown in the figure has the same number of pin marks 15 as the connecting holes 5 at predetermined intervals. In the illustrated base 1, the interval between the connecting holes 5 is increased from the front tooth portion toward the molar portion, so that the interval between the adjacent pin marks 15 is also gradually increased from the front tooth portion toward the molar portion. In this way, the base 1 that gradually increases the interval between the pin marks 15 from the front tooth portion toward the molar portion is arranged so that the dowel pins 3 are positioned below the respective tooth models 4A of the tooth model 4 of the entire jaw. it can.

  Further, the base 1 of FIGS. 15 and 16 is provided with a positioning mark 17 between adjacent pin marks 15. The positioning mark 17 is provided at the center of the adjacent pin mark 15. These positioning marks 17 are provided to accurately position the tooth model 4 when the tooth model 4 is fixed on the fixing plate 2. The base 1 shown in the drawing is provided with a plurality of rows of positioning marks 17 on opposite side surfaces, that is, on the outer peripheral surface and the inner peripheral surface of the curved base 1. The positioning mark 17 is a ridge extending in the direction of the dowel pin 3 and is integrally formed in the process of molding the plastic base 1. The base 1 of FIGS. 15 and 16 is provided with a protruding line of the positioning mark 17 so as to extend in the direction of the dowel pin 3 from the boundary surface (upper part in the drawing) with the fixed plate 2. The base 1 in the figure is provided with a ridge having a length that is approximately ½ of the total height, and is used as a positioning mark 17. Further, the height and width of the ridge of the positioning mark 17 is preferably about 1 mm, but may be 0.5 mm to 3 mm. The positioning marks of the ridges provided on the outer peripheral surface of the base 1 can be made higher to make it difficult to slip when the base 1 is gripped.

  In the base 1 in the figure, the interval between the adjacent pin marks 15 is increased from the front tooth portion toward the molar tooth portion, and therefore the interval between the positioning marks 17 provided between the adjacent pin marks 15 is also changed from the front tooth portion to the molar tooth. Increasingly larger toward the part. In this way, the base 1 that gradually increases the distance between the positioning marks 17 from the front tooth portion toward the molar portion is obtained by replacing each tooth model 4A of the tooth model 4 of the entire jaw fixed to the upper surface of the fixing plate 2, It can be arranged at an optimum position with respect to the dowel pin 3 arranged below.

  Further, the all-jaw base 1 shown in the drawing uses a positioning mark 17 arranged on the center line of the base 1 among a plurality of positioning marks 17 provided on the outer peripheral surface as a median mark 17X. The median mark 17X is a mark indicating the center line of the base 1 of the entire jaw, and is fixed to the fixed plate 2 while positioning the center of the tooth model 4 on the median mark 17X. Thus, the tooth profile model 4 that can be correctly arranged at the center of the base 1 of the entire jaw has a feature that it can be fixed to the fixing plate 2 with a good appearance while reducing the left-right positional deviation.

  Further, although not shown, the base of the entire jaw can also be provided with a plurality of positioning marks between adjacent pin marks, similarly to the base of the above-described part. However, since the base of the entire jaw gradually increases the interval between adjacent pin marks from the front tooth portion toward the molar portion, the interval between the multiple positioning marks provided between the adjacent pin marks is also the front tooth portion. It can be enlarged at a predetermined rate from the molar part toward the molar part. Furthermore, even in the base of the entire jaw in which a plurality of positioning marks including a main positioning mark and a sub positioning mark are provided between adjacent pin marks, the interval between the main positioning marks provided between the adjacent pin marks is set. The tooth profile model can be accurately positioned by gradually increasing the size from the front tooth portion toward the molar tooth portion.

  As shown in FIG. 14, the working model 200 for a full-dental dental technician having the above structure is configured such that the dowel pins 3 of the fixing plate 2 are inserted into the connection holes 5 of the base 1, and further, on the outside and inside of the stepped protrusion 14. The provided fitting protrusion 6 is fitted into the fitting recess 7 of the fixed plate 2 to connect the fixed plate 2 to a fixed position of the base 1. This dental technician work model 200 includes a fixed plate 2 shaped along the whole jaw tooth model 4 and a fitting structure in which a plurality of dowel pins 3 and connection holes 5 are connected to each other, and the base 1 and the fixed plate 2 are opposed to each other. The joint protrusion 6 and the fitting structure 6 of the fitting recess 7 can be firmly connected to a fixed position of the base 1.

  Further, the working model 200 for the full jaw dental technician is fixed to the upper surface of the fixing plate 2 connected to the base 1 while positioning the whole jaw dental model 4. As shown in FIGS. 17 and 18, in the tooth profile model 4, the boundary positions of a plurality of adjacent teeth arranged along a horseshoe-shaped curved line face the positioning marks 17 provided on the peripheral wall 11 of the base 1 in a balanced manner. To be positioned. The tooth model 4 shown in FIG. 17 shows a state in which each tooth model 4 </ b> A is large and the tooth model 4, which is a large jaw, is arranged on the fixed plate 2. As shown in this figure, the tooth profile model 4 having a large jaw is fixed in a state of facing the positioning mark 17 provided on the base 1 in a well-balanced manner by being fixed close to the outer periphery of the fixing plate 2. it can. On the other hand, as shown in FIG. 18, the tooth profile model 4 having a small jaw is balanced against the positioning mark 17 provided on the base 1 by fixing the tooth profile model 4 close to the inner periphery of the fixing plate 2. Can be fixed in a state of facing well. Thereby, as shown in the figure, even when the denture model 4 of the entire jaw includes a plurality of crown prostheses 21, it is ideal for the divided model 20 to which each of the crown prostheses 21 is connected. While placing the dowel pins 3 in the state, the denture model 4 of the entire jaw can be placed at an accurate position of the fixed plate 2.

The dental technician work models 100 and 200 are manufactured as follows.
(1) The base 1 is molded from plastic. The base 1 is molded into a predetermined shape by filling a mold with molten plastic. The plastic for molding the base 1 is formed by mixing, for example, 30% by weight of powder. Examples of the plastic include polyethylene resin, polypropylene resin, polyvinyl chloride resin, nylon resin, polystyrene resin, and urethane resin. For the powder mixed with the plastic, wood chips having an average particle size of 10 μm to 100 μm are preferably used. However, the powder to be filled into the base, can be added to the wood chips, stone powder, gypsum powder, and inorganic powders such as calcium carbonate, also be filled into the plastic by mixing the powder organic powder, such as coconut shell powder.
(2) The fixed plate 2 is formed. The fixing plate 2 is made of gypsum or, like the base 1, made of plastic filled with powder. Although not shown, the fixing plate is manufactured by injecting gypsum mud or molten plastic forming the fixing plate into a mold in which dowel pins are arranged at predetermined positions, or as shown in FIG. It is manufactured by filling gypsum mud or molten plastic forming the fixed plate 2 inside the molding peripheral wall 19 provided along the outer periphery of the stepped convex portion 14 of the base 1 into which the dowel pin 3 is inserted.
After the gypsum mud or plastic is cured, the fixed plate 2 in which the dowel pins 3 are embedded is removed from the mold or the base 1.
(3) The tooth model 4 is bonded and fixed to the upper surface of the fixing plate 2. As shown in FIGS. 11 to 13, the partial tooth model 4 is fixed while being positioned so that the position of the cutting line 23 for cutting the divided model 20 is symmetrical with respect to the opposing positioning mark 17. Fix to plate 2. Further, as shown in FIGS. 17 and 18, the jaw model 4 of the entire jaw has a positioning mark provided on the peripheral wall 11 of the base 1 at the boundary positions of a plurality of adjacent teeth arranged along a horseshoe-shaped curved line. 17 is fixed to the fixing plate 2 while being positioned so as to face 17 in a balanced manner. However, as shown in FIG. 10, the method of manufacturing the fixed plate by injecting gypsum mud or molten plastic into the inner wall of the molding peripheral wall 19 is a step of molding the fixed plate, and the tooth profile model on the gypsum mud or molten plastic. It is also possible to fix the tooth model to the fixing plate.

The dental technician work models 100 and 200 manufactured as described above are used to manufacture various crown prostheses 21 as described below.
(1) Before taking an impression from a patient, a dentist cuts a tooth of a portion where a dental prosthesis is provided in advance to form an abutment tooth. Accordingly, the tooth model 4 of the dental technician work models 100 and 200 has an abutment tooth model 22 formed in a portion where the crown prosthesis 21 is manufactured, as shown in FIGS. 6, 7, and 14. Yes.
(2) The technician creates the dental prosthesis 21 to be mounted on the abutment tooth model 22 of the dental technician work model 100, 200 with a resin or metal. A certain tooth model 4A gets in the way. A divided model 20 is made so that the tooth models 4A on both sides do not get in the way. The divided model 4 is configured such that a part for producing the crown prosthesis 21 can be separated from an adjacent part.
(3) The divided model 20 is manufactured by cutting the tooth model 4 and the fixed plate 2 at a predetermined position, as shown in FIGS. 2, 4 to 6, 14, 17, and 18. . The tooth model 4 and the fixing plate 2 are cut by cutting lines 23 on both the left and right sides of the dowel pin 3 on both sides of a portion where the crown prosthesis 21 is manufactured. The tooth model 4 and the fixed plate 2 are separated from the divided model 20 by cutting the cutting line 23 with a saw. At this time, in order to cut off the fixing plate 2 with certainty, a part of the step protrusion 14 which is the upper part of the base 1 is also cut. The base 1 is made of plastic made by mixing a considerable amount of powder, so that the generated chips can be cut smoothly without clogging the saw, and the fixed plate 2 can be reliably separated from the base 1. it can. As shown in FIGS. 6 and 7, the divided model 4 is detachably attached to a fixed position of the base 1 via the dowel pin 3.
(4) Using the divided model 20 manufactured in this state, the crown prosthesis 21 to be attached to the abutment tooth model 22 is made of resin or metal. Since the divided model 20 that can divide the abutment tooth model 22 from the base 1 can be processed efficiently and accurately even at the boundary with the adjacent tooth model 4A, the crown prosthesis 21 can be manufactured efficiently.

DESCRIPTION OF SYMBOLS 1 ... Base 2 ... Fixed plate 3 ... Dowel pin 4 ... Tooth model 4A ... Tooth model 5 ... Connection hole 6 ... Fitting protrusion 7 ... Fitting recessed part 8 ... Positioning convex part 9 ... Positioning concave part 10 ... Planar plate 11 ... Perimeter wall 12 ... Cylinder 13 ... Reinforcement rib 13A ... Horizontal reinforcement rib
13B ... Vertical reinforcing rib 14 ... Step protrusion 15 ... Pin mark 16 ... 鍔 17 ... Position mark 17A ... Main position mark
17B ... Sub positioning mark
17X: Median mark 18 ... Connecting plate 19 ... Molded peripheral wall 20 ... Divided model 21 ... Crown prosthesis 22 ... Abutment tooth model 23 ... Cutting line 24 ... Denture 80 ... Divided model 81 ... Crown prosthesis 91 ... Base 92 ... Fixing plate 93 ... Dowel pin 94 ... Tooth model 94A ... Tooth model 95 ... Connection hole 100 ... Dental technician work model 200 ... Dental technician work model

Claims (3)

A fixed plate (2) to which the tooth model (4) is fixed, a plurality of dowel pins (3) having one end connected to the fixed plate (2), and removably connected via the dowel pins (3) A plastic base (1),
The fixing plate (2) fixes dowel pins (3) at a predetermined interval along the longitudinal direction,
The base (1) is provided with a connecting hole (5) through which a dowel pin (3) fixed to the fixing plate (2) can be inserted and removed,
The dowel pin (3) is inserted into a connection hole (5), and the fixed plate (2) is a dental technician work model configured to be connected to a fixed position of the base (1),
A working model for dental technician, wherein the foundation (1) is formed by mixing powders of 5 wt% or more and 70 wt% or less , and the powder contains wood chips . The working model for dental technician according to claim 1, wherein the base (1) is provided with a stepped convex portion (14) having the same outer shape as the fixed plate (2) on an upper surface. The working model according to claim 1 or 2, wherein the fixed plate (2) is made of plastic obtained by mixing gypsum or powder.

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