JP7412764B2 - Implants and drills used in implant restoration methods - Google Patents

Description

The present invention relates to an implant and a drill used in an implant repair method.

As shown in FIG. 11, in conventional dental implant treatment, an implant (fixture) 53 is inserted into a drill hole 52 formed in the alveolar bone 51 in the tooth defect area, and the rear end of the implant 53 is inserted into the drill hole 52. , it is common to attach an upper prosthesis 55 via an abutment 54.

However, in conventional dental implant treatment, there is a problem in that the implant 53 is exposed due to subsequent bone loss (see broken line in FIG. 3). In this case, it is conceivable to re-insert the implant 53, but a series of re-operations for this would place a heavy burden on the patient.

The present invention has been made with the above-mentioned considerations in mind, and its purpose is to provide an implant and a drill for use in an implant repair method that can prevent subsequent bone loss while reducing the burden placed on the patient. It is about providing.

The present invention provides an implant and a drill for use in a method for repairing an implant implant having a male thread on at least a portion of its outer peripheral surface, the implant having a portion located between the threads of the male thread. The outer diameters are approximately the same, and the drill rotates the cylindrical part to fit into the implant from outside the implant and cuts a predetermined portion of the external thread. A cutting part is provided, the cutting part being formed at the lower end of the cylindrical part and having a sawtooth shape having a downward tip with a plurality of sawtooths. Item 1).

The present invention provides an implant and a drill used in an implant repair method that can cope with subsequent bone loss while reducing the burden on a patient in an implant having a male thread on at least a portion of the outer circumferential surface. .

That is, in the state shown in FIG. 7(B) where dental implant treatment has been performed, if the alveolar bone becomes thinner due to subsequent bone loss and the male threaded part of the implant is no longer covered by the alveolar bone 51 and becomes exposed, In the implant repair method of the invention according to claim 1 of the present application, the implant is inserted into the drill hole 52 formed in the alveolar bone [see FIG. 2(A)], and a drill is inserted from outside the implant. 10 [see FIG. 3(A)] is fitted over the cylindrical portion 11 [see FIG. 4(A)], and the cylindrical portion is rotated to cut a predetermined portion of the male thread ( The exposed upper male threaded portion) can be cut to restore the implant to the state shown in Figure 5(A), so the implant in the implanted state (embedded state) can be pulled out and a new implant inserted. Since surgery such as re-drilling a hole for implantation (embedding) is not necessary, the burden on the patient can be reduced.

In restoring the implant, in the implant and drill of the invention according to claim 2 of the present application, the outer diameter A (see FIG. 1(A)) of the portion located between the threads of the male thread of the implant is approximately the same. On the other hand, the drill (see FIG. 8) rotates the cylindrical portion 11 and the cylindrical portion for fitting from the outside of the implant in the implanted state (see FIG. 4(A)). The implant has a cutting portion 12 (see FIG. 8) that moves to cut a predetermined portion (the exposed male thread portion) 5a (see FIG. 3(A)) of the male thread, so that the implant can cut the guide of the drill. At the same time, the predetermined portion of the male thread (the exposed male thread portion) can be efficiently cut. That is, the male threaded portion 5a exposed from the alveolar bone can be cut by operating the drill in the order shown in FIGS. 3(A), 4(A), and 5(A).

(A) is a configuration explanatory diagram showing an implant used in an implant repair method according to an embodiment of the present invention. (B) is a configuration explanatory diagram showing an implant in a state of being implanted (embedded) in alveolar bone before bone loss. (A) is a configuration explanatory diagram showing the implanted state of an implant after bone loss. (B) is a configuration explanatory diagram showing the implant with an abutment attached to the rear part from the state shown in FIG. 1(B). (A) is a configuration explanatory diagram showing a state in which a drill is positioned directly above the implant shown in FIG. 2(A) in the above embodiment. (B) is a diagram corresponding to FIG. 2(B). (A) in the above embodiment, the cylindrical part of the drill is externally fitted to both the end of the implant shown in FIG. FIG. 3 is a configuration explanatory diagram showing a state in which the predetermined portion of the male thread is being cut by the cutting portion of the drill while moving. (B) is a diagram corresponding to FIG. 2(B) and FIG. 3(B). (A) is a configuration explanatory diagram of the implant shown in the above embodiment, showing a state after the drill is removed from the implant shown in FIG. 4(A) and the predetermined portion is cut. (B) is a diagram corresponding to FIG. 2(B), FIG. 3(B), and FIG. 4(B). (A) is a configuration explanatory diagram showing a state in which a new abutment is attached to the rear part of the implant shown in FIG. 5(A) in the above embodiment. (B) is a diagram corresponding to FIG. 2(B), FIG. 3(B), FIG. 4(B), and FIG. 5(B). (A) is a configuration explanatory diagram showing a state after repair in which the upper prosthesis is attached via the abutment shown in FIG. 6(A) in the above embodiment. (B) is a structural description showing the state before repair in which the upper prosthesis is attached via the abutments of FIGS. 2(B), 3(B), 4(B), and 5(B). It is a diagram. It is an external view showing the drill used in the above-mentioned embodiment. It is a longitudinal cross-sectional view showing a drill used in the above embodiment. It is a front view for explaining another example of a drill. FIG. 1 is an explanatory diagram schematically showing a conventional dental implant treatment method.

Embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited thereby.

As shown in FIG. 1, the implant D before restoration used in this embodiment is implanted (embedded) in a drill hole 52 (see FIG. 10) formed in alveolar bone 51 (see FIG. 10). It has a substantially cylindrical front part 3 and a rear part 4a (and 4b) for attaching an abutment (see FIGS. 3(A) and 5(A)).

As shown in FIGS. 1 and 2, a male thread 5 is formed on the outer peripheral surface of the front part 3, and the outer diameter A of the portion located between the threads of the male thread 5 is determined at any position on the front part 3. are also set substantially the same.

At the rear parts 4b and 4a of the implant D inserted into the drill hole 52, abutments 6a and 6b are installed, for example, as shown in FIGS. 6(A) and 6(B) and FIGS. 7(A) and (B). The upper prostheses 7a and 7b are respectively attached thereto.

Here, the abutments 6a and 6b are attached to the rear portions 4b and 4a using appropriate known means. For example, in this embodiment, both are connected by screw connection.

In short, appropriate measures are taken so that it is extremely difficult to pull out the abutments 6a and 6b connected to the implant D from the implant D with bare hands, and the rotation of the abutments 6a and 6b with respect to the implant D is restricted. It is done using

Furthermore, the upper prostheses 7a and 7b are attached to the abutments 6a and 6b by a known method.

As described above, the implant D is implanted with a male thread 5 on the outer peripheral surface of the approximately cylindrical front part 3, and the outer diameter A of the portion located between the threads of the male thread 5 is approximately the same. On the other hand, the drill 10 includes a cylindrical portion 11 for fitting from the outside of the implant D in an implanted state, and rotates this cylindrical portion 11 to drill a predetermined portion 5a of the external thread 5 [FIG. 3( A).

The predetermined portion of the male screw 5 is a portion from height 1 to height 2, as shown in FIG. 2 and the like.

In this embodiment, the abutment 6a in FIG. 6(A) is set longer than the abutment 6b in FIG. 6(B) by the length of the cut male threaded portion 5a. Further, the lengths are set so that the upper surface of the abutment 6a and the upper surface of the abutment 6b are at the same height. Further, the upper prosthesis 7a in FIG. 7(A) is set longer than the upper prosthesis 7b in FIG. 7(B) by the length of the cut male threaded portion 5a. Further, the lengths of the upper surfaces of the upper prostheses 7a and 7b are set so that they are at the same height.

Further, the cross-sectional shape of the inner circumferential surface 13 of the cylindrical portion 11 is circular. In this embodiment, the dimensions of the outer diameter A of the portion located between the threads of the male screw 5 and the circular inner diameter a of the cylindrical portion 11 are as follows.

A≒a

On the other hand, the cutting part 12 has a sawtooth shape formed at the lower end of the cylindrical part 11. That is, the plurality of saw teeth 12a are formed in series with the cylindrical portion 11 with sharp downward tip portions t.

Furthermore, the drill 10 has a connecting portion 14 that is connected to a drill driving means such as a motor, as shown in FIGS. 8 and 9. This connecting portion 14 is integrally formed at the upper end of the cylindrical portion 11. Note that illustration of this connecting portion 14 is omitted in FIGS. 3(A), 4(A), and 5(A).

In the dental implant shown in FIG. 7(B), due to the decrease in bone mass, the upper part of the front part 3 where the external thread 5 is formed on the outer peripheral surface, that is, the predetermined part 5a, is eventually covered with the alveolar bone 51. When it is removed and exposed (see FIG. 2(A)), the predetermined portion 5a is scraped off by the cutting section 12. During this scraping, the drill 10 is rotated in the opposite direction to the winding direction of the male thread 5 (for example, in the opposite direction if the male thread 5 is a right-handed thread) and slowly scrapes the male thread 5, for example, to remove one thread. Scrape it off in about 5 minutes. Thereafter, the abutment 6a, which is longer by the amount removed, is attached to the rear part 4b.

Subsequently, by attaching an upper prosthesis 7a of a size such that its upper surface is the same as that of the upper prosthesis 7b to the abutment 6a, the predetermined portion 5a can be returned to a state in which it is not exposed. Therefore, surgery such as pulling out the implant D and re-drilling the drill hole 52 is not necessary, so that the burden on the patient can be reduced.

FIG. 10 shows another embodiment of the drill 10. In this drill 10, an opening 14 communicating with the inside of the cylindrical part 11 is provided in the columnar part 13 at the top of the cylindrical part 11, and the cutting waste scraped by the cutting part 12 of the drill 10 is discharged from the opening 14. be done.

D Implant A Outer diameter 5 Male thread 5a Predetermined part of male thread 10 Drill 11 Cylindrical part 12 Cutting part

Claims (1)

An implant and a drill used in a method for repairing an implant implanted with a male thread on at least a portion of its outer peripheral surface, the implant having an outer diameter of a portion located between the threads of the male thread, respectively. The drill has a cylindrical part for fitting from the outside of the implant in the implanted state, and a cutting part for rotating this cylindrical part to cut a predetermined portion of the male thread. have,
The implant and the drill are characterized in that the cutting part is formed at the lower end of the cylindrical part and has a sawtooth shape with a plurality of sawtooths having a pointed downward tip.