DENTAL PROSTHESIS AND ITS MANUFACTURING METHOD

Abstract

Disclosed herein are a dental prosthesis and its manufacturing method for restoring a lost tooth. The dental prosthesis has a male member formed on a holding part attached on an adjacent tooth for attaching an artificial tooth on the adjacent tooth and a female member formed in the artificial tooth so that the artificial tooth and the adjacent tooth can be connected with each other without grinding the adjacent tooth. The method for manufacturing the dental prosthesis includes the steps of duplicating an original model, waxing up the duplicated model, holding a sprue on the duplicated model in a state where the duplicated model is waxed up, and investing, burning out and casting the duplicating model.

Claims

1. A dental prosthesis comprising: a first holder comprising a first holding part configured to tightly engage with a first tooth and further comprising a first male member, wherein the first holding part comprises a first buccal sidewall, a first lingual sidewall, and a first intermediate sidewall that interconnects the first buccal sidewall and the first lingual sidewall, wherein the first male member is fixed to the first intermediate sidewall such that the first holder is in the form of a single piece; a second holder comprising a second holding part configured to tightly engage with a second tooth and further comprising a second male member, wherein the second holding part comprises a second intermediate sidewall and at least one of a second buccal sidewall and a second lingual sidewall, wherein the first male member is fixed to the second intermediate sidewall such that the second holder is in the form of a single piece; and an artificial tooth comprising a first female member configured to receive the first male member and further comprising a second female member configured to receive the second male member such that the artificial tooth is configured to contact the first intermediate sidewall and the second intermediate sidewall and be interposed therebetween when the first female member receives the first male member and when the second female member receives the second male member; wherein the first buccal sidewall and the first lingual sidewall generally oppose each other such that the first tooth is interposed therebetween, wherein the first holding part comprises a first gap between the buccal sidewall and the first lingual sidewall such that the first holding part does not form a closed loop encircling a circumference of the first tooth, wherein the first holding part further comprises a groove extending from the gap into either or both of the first buccal sidewall and the first lingual sidewall; wherein the first buccal sidewall has a bottom edge corresponding to the gum edge of the first tooth, wherein the bottom edge of the first buccal sidewall is contoured along the gum edge of the first existing tooth.

2. The dental prosthesis of claim 1, wherein the first holding part further comprises an upper lingual extension extending from the first lingual sidewall, wherein the first holding part further comprises a lower lingual extension extending from the first lingual sidewall, wherein the groove is interposed between the upper and lower lingual extensions.

3. The dental prosthesis of claim 1, wherein the groove extends from the first gap into the first lingual sidewall.

4. The dental prosthesis of claim 3, wherein the first lingual sidewall comprises an upper lingual side extension and a lower lingual side extension that are configured to contact a lingual surface of the first tooth, wherein the groove is defined between the upper and lower lingual side extensions.

5. The dental prosthesis of claim 1, wherein the groove extends from the first gap into the first buccal sidewall.

6. The dental prosthesis of claim 5, wherein the first buccal sidewall comprises an upper buccal side extension and a lower buccal side extension that are configured to contact a buccal surface of the first tooth, wherein the groove is defined between the upper and lower buccal side extensions.

7. The dental prosthesis of claim 1, wherein the groove extends from the first gap into the first buccal sidewall, wherein the groove is referred to as a first groove, wherein a second groove extends from the first gap into the first lingual sidewall.

8. The dental prosthesis of claim 7, wherein the first buccal sidewall comprises an upper buccal side extension and a lower buccal side extension that are configured to contact a buccal surface of the first tooth, wherein the first groove is defined between the upper and lower buccal side extensions.

9. The dental prosthesis of claim 8, wherein the first lingual sidewall comprises an upper lingual side extension and a lower lingual side extension that are configured to contact a lingual surface of the first tooth, wherein the second groove is defined between the upper and lower lingual side extensions.

10. A method of installing a dental prosthesis, the method comprising: providing a first holder that comprises a first holding part and a first male member, wherein the first holding part comprises a first buccal sidewall, a first lingual sidewall, and a first intermediate sidewall that interconnects the first buccal sidewall and the first lingual sidewall, wherein the first buccal sidewall and the first lingual sidewall generally oppose each other, wherein the first male member is fixed to the first intermediate sidewall such that the first holder is in the form of a single piece; providing a second holder that comprises a second holding part and a second male member, wherein the second holding part comprises a second intermediate sidewall and at least one of a second buccal sidewall and a second lingual sidewall, wherein the first male member is fixed to the second intermediate sidewall such that the second holder is in the form of a single piece; engaging the first holder with a first tooth of a patient such that each of the first buccal sidewall, the lingual sidewall and the first intermediate sidewall contacts a corresponding surface of the first tooth, such that the first tooth is interposed between the first buccal sidewall and the first lingual sidewall, and further such that a bottom edge of the first buccal sidewall is contoured along a gum edge of the first tooth; engaging the second holder with a second tooth of a patient such that each of the second intermediate sidewall and the at least one of the second and the second lingual sidewall contacts a corresponding surface of the second tooth, wherein the patient has an open space between the first tooth and the second tooth, wherein after engaging the first holder and the second holder, the first male member and the second male member are located in the open space, wherein the first holding part comprises a first gap between the first buccal sidewall and the first lingual sidewall such that, after engaging the first holder, the first holding part does not form a closed loop encircling a circumference of the first tooth; and placing, in the open space, an artificial tooth that comprises a first female member and a second female member such that the first male member of the first holder is received in the first female member, such that the second male member of the second holder is received in the second female member and further such that the artificial tooth is interposed between and contacts the first intermediate sidewall and the second intermediate sidewall.

11. The method of claim 10, wherein the second holding part comprises the second buccal sidewall, wherein the second holder is engaged with the second tooth such that a bottom edge of the second buccal sidewall is contoured along a gum edge of the second tooth.

12. The method of claim 10, wherein the second holding part comprises the second buccal sidewall and the second lingual sidewall, wherein the second holder is engaged with the second tooth such that a bottom edge of the second buccal sidewall is contoured along a gum edge of the second tooth.

13. The method of claim 12, wherein the second holding part comprises a second gap between the second buccal sidewall and the second lingual sidewall such that, after engaging the second holder, the second holding part does not form a closed loop encircling a circumference of the second tooth.

14. The method of claim 10, wherein the first holding part further comprises a groove extending from the gap into either of the first buccal sidewall and the first lingual sidewall.

15. The method of claim 14, wherein the first holding part further comprises an upper lingual extension extending from the first lingual sidewall, wherein the first holding part further comprises a lower lingual extension extending from the first lingual sidewall, wherein the groove is interposed between the upper and lower lingual extensions.

16. The method of claim 14, wherein the groove extends from the first gap into the first lingual sidewall, wherein no groove is formed into the first buccal sidewall.

17. The method of claim 14, wherein the first buccal sidewall comprises an upper buccal side extension and a lower buccal side extension that are configured to contact a buccal surface of the first tooth, wherein the groove is defined between the upper and lower buccal side extensions.

18. The method of claim 14, wherein the groove extends from the first gap into the first buccal sidewall, wherein the groove is referred to as a first groove, wherein the first holding part further comprises a second groove extending from the first gap into the first lingual sidewall.

19. The method of claim 18, wherein the first buccal sidewall comprises an upper buccal side extension and a lower buccal side extension that are configured to contact a buccal surface of the first tooth, wherein the first groove is defined between the upper and lower buccal side extensions.

20. The method of claim 18, wherein the first lingual sidewall comprises an upper lingual side extension and a lower lingual side extension that are configured to contact a lingual surface of the first tooth, wherein the second groove is defined between the upper and lower lingual side extensions.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG. 1 is a side view showing a grinding portion in the case where a conventional dental prosthesis is applied;

[0014] FIG. 2 is a side view showing a mounted state of the conventional dental prosthesis;

[0015] FIG. 3 is an exploded perspective view of a dental prosthesis according to the present invention;

[0016] FIG. 4 is an enlarged view of a lingual side of FIG. 3;

[0017] FIG. 5 is an enlarged view of a lingual side of male members formed at both ends of a holding part of the dental prosthesis according to the present invention;

[0018] FIG. 6 is a perspective view and a plan view showing a state where an S-shaped holding part is mounted on adjacent teeth according to the present invention;

[0019] FIG. 7 is a perspective view of an integrated type holding part of the present invention;

[0020] FIG. 8 is a perspective view of a separated type holding part of the present invention;

[0021] FIG. 9 is a perspective view showing a coupling part formed at the rear part of the holding parting FIG. 8;

[0022] FIG. 10 is a perspective view showing coverage of the pit, the non-functional cusp and a portion of the occlusal surface;

[0023] FIG. 11 is a perspective view of a modification of the holding part of FIG. 7;

[0024] FIG. 12 is a plan view of the separated type holding part and the male member of FIG. 8;

[0025] FIG. 13 is a plan view of the integrated type holding part and the male member;

[0026] FIG. 14 is a side view of the holding parts of FIGS. 7 and 8 seen from the buccal side;

[0027] FIG. 15 is a side sectional view, in a partial section, showing a mounted state of the dental prosthesis according to the present invention;

[0028] FIG. 16 is a front view, in a partial section, showing an angle of the male member of the dental prosthesis according to the present invention;

[0029] FIG. 17 is a sectional view showing a state where the male member of the holding part is coupled to an artificial tooth of the dental prosthesis according to the present invention;

[0030] FIG. 18 is a side view showing a mounted state of the prosthesis according to the present invention;

[0031] FIG. 19 is a perspective view of an embedded type holding part according to the present invention;

[0032] FIG. 20 is a perspective view of the embedded type holding part according to the present invention;

[0033] FIG. 21 is a perspective view of the embedded type holding part according to the present invention;

[0034] FIG. 22 is a perspective view of the embedded type holding part according to the present invention;

[0035] FIG. 23 is a perspective view showing a state where an embedded part is added to FIG. 19;

[0036] FIG. 24 is a perspective view showing a modification of the holding part of FIG. 19;

[0037] FIG. 25 is a front view and a perspective view showing an indented portion of a scratch type;

[0038] FIG. 26 is a front view and a perspective view showing an indented portion of a dot type;

[0039] FIG. 27 is a front view and a perspective view showing an indented portion of a hole type;

[0040] FIG. 28 is a front view and a perspective view showing an indented portion of a box type;

[0041] FIG. 29 is a front view showing a grinding portion on a lingual side of the anterior tooth;

[0042] FIG. 30 is a front view showing another grinding portion on the lingual side of the anterior tooth;

[0043] FIG. 31 is a perspective view showing the embedment at the rear of an embedded type holding part;

[0044] FIG. 32 is a perspective view showing another embedment at the rear of the embedded type holding part;

[0045] FIG. 33 is a plan view of the embedded type holding part and a male member;

[0046] FIG. 34 is a side view of the holding parts seen from the buccal side;

[0047] FIG. 35 is a side sectional view, in a partial section, showing a mounted state of the dental prosthesis according to the present invention;

[0048] FIG. 36 is a front view, in a partial section, showing an angle of the male member of the dental prosthesis according to the present invention; and

[0049] FIG. 37 is a sectional view showing a state where the male member of the holding part is coupled to an artificial tooth of the dental prosthesis according to the present invention

EMBODIMENTS

[0050] Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

[0051] FIGS. 3 to 17 are views showing a dental prosthesis according to a embodiment of the present invention.

[0052] As shown in FIGS. 3 and 4, the dental prosthesis according to the present invention includes: an artificial tooth 5 having female members 6 and slots 6a; and holding parts 3 and 4 respectively having male members 7 formed integrally with the holding parts 3 and 4 and inserted into the female members 6 and the slots 6a of the artificial tooth 5, and fixed to an adjacent tooth 8.

[0053] Combining force between the holding parts 3 and 4 and the adjacent tooth 8 is increased by maximizing an area of the holding parts 3 and 4, and combining force between the holding parts 3 and 4 and the artificial tooth 5 is increased by maximizing an area of the female member 6 and the male member 7. At this time, sizes of the female member 6 and the male member 7 are adjustable according to circumstances.

[0054] Meanwhile, the male member 7 and the holding parts 3 and 4 are formed integrally with each other as shown in FIG. 7, or divided into a lingual side and a buccal side as shown in FIG. 8.

[0055] Furthermore, in the case where the male member 7 and the holding parts 3 and 4 are divided into the lingual side and the buccal side and there is no tooth at the back of the holding parts 3 and 4, as shown in FIG. 9, a pair of projection 9a and groove 9b are formed at the ends of the lingual holding part 3 and the buccal holding part 4 and coupled with each other in order to increase combining force between the holding parts 3 and 4.

[0056] After that, in case of the adjacent tooth 8 whose holding parts 3 and 4 may be exposed to the outside, as shown in FIGS. 12 and 13(3), on the anterior tooth and a portion which requires an aesthetic sense, only the lingual holding part 3 is formed, but on the posterior tooth as shown in FIG. 4, the lingual holding part 3 and the buccal holding part 4 may be formed separately as shown in FIG. 8 or integrally as shown in FIG. 7. Alternatively, the prosthesis can be formed in an S shape (FIG. 6) in such a way that only the lingual holding part 3 is mounted on the anterior tooth and the front portion of the artificial tooth and only the buccal holding part 4 is mounted on a molar tooth and the posterior tooth of the artificial tooth. In the prosthesis having the above structure, the holding part is not exposed to the outside since only the lingual holding part 3 is mounted on the anterior tooth and the portion, which requires the aesthetic sense.

[0057] Meanwhile, as shown in FIG. 10, the holding parts 3 and 4 are manufactured in such a way that the pit, the non-functional cusp and the entire or a part of the occlusal surface, which is not in contact with the opposite tooth, are covered. Furthermore, the lingual holding part 3 mounted on the anterior tooth and the portion which requires the aesthetic sense covers the lingual side to the maximum within a range not causing any obstacle to occlusion, whereby the prosthesis can endure lateral pressure and vertical pressure.

[0058] Moreover, the male member 7 may be formed in one of T, I, L and O shapes and other various shapes in order to maximize holding force between the female member 6 and the male member 7. Shape of the female member 6 and the slot 6a is determined according to the shape of the male member 7.

[0059] Additionally, as shown in FIG. 5, in the case where there is any missing tooth at the right or left of the adjacent tooth, since the prosthesis can be manufactured in such a way that the male member 7 is formed at the right or left of the holding part, it can prosthetically treat the missing tooth in any cases with no grinding.

[0060] The male member 7 having the above structure serves to keep parallel between the missing adjacent teeth together with the holding part, so as to lead a smooth insertion of the artificial tooth 5 and reinforce compression resistance.

[0061] Therefore, the prosthesis according to the present invention can endure vertical pressure and horizontal pressure using elasticity of metal of the prosthesis used for tooth restoration, and the structure and gradient of the tooth to the maximum, and endure any external forces by surrounding the lingual pit and the buccal pit, the non-functional cusp, and the occlusal surface of the adjacent tooth, which are not in contact with the opposite tooth during occlusion.

[0062] Meanwhile, a method for manufacturing the dental prosthesis according to the present invention includes the steps of: duplicating an original model; waxing up the duplicated model; holding a sprue on the duplicated model in a state where the duplicated model is waxed up, and investing, burning out and casting the duplicated model.

[0063] In the case of the holding part and the female member manufactured by the above method, even though there is an under-cut, the lingual holding part can be formed from the lingual part at least to an area where the buccal part is started and the buccal holding part can be formed from the buccal part at least to an area where the lingual part is started. In the present invention, not only the separate type holding parts but also the integrated type holding parts can be attached to the lingual and buccal pits, the non-functional cusp and the occlusal surface, which is not in contact with the opposite tooth, of the missing adjacent tooth with no grinding of the tooth.

[0064] As shown in FIG. 11, the holding part has a groove 10 formed at the rear thereof in order to increase flexibility of the holding part, to cover the lingual and buccal pits, the non-functional cusp and the occlusal surface, which is not in contact with the opposite tooth, to the maximum, and to be easily mounted the holding part

[0065] As described above, the lingual holding part 3 and the buccal holding part 4 can be formed integrally with each other.

[0066] Hereinafter, referring to FIGS. 18 to 37, the integrated type holding part 1 will be described in detail.

[0067] The dental prosthesis according to the present invention includes the holding part 1, a projection 9 formed on the holding part 1, a male member 7 attached on the holding part 1, and a female member 6 formed on an artificial tooth 5.

[0068] The holding part 1 may have one of various forms in consideration of holding force and an aesthetic sense, for example, a form that the holding part 1 is restricted only to a ground adjacent side (FIG. 22), a form that the holding part 1 extends from the ground adjacent side to the lingual side (FIG. 20), a form that the holding part 1 extends from the ground adjacent side to the buccal side (FIG. 21), or a form that the holding part 1 extends to the lingual side and the buccal side (FIG. 19). The ground form and size of the holding part 1 can be changed according to the size and position of the adjacent side of the lost adjacent tooth 8. Grinding is carried out within a range that a patient does not feel or sense abnormality without anesthesia. At this time, the holding part 1 has a depth of 0.5 mm-2 mm. Grinding of the embedded type holding part 1 of the anterior tooth or a portion requiring the aesthetic sense is carried out at the lingual side and the adjacent side (including or not including the occlusal surface, but grinding of the holding part 1 of the premolar and the molar is restricted only to the adjacent side (including or not including the occlusal surface of the adjacent side), carried out only at the adjacent side and the lingual side (including or not including the occlusal surface of the lingual side) or the buccal side (including or not including the occlusal surface of the buccal side), or carried out at the adjacent side and the lingual and buccal sides (including or not including the occlusal surfaces of the lingual and buccal sides). The holding part 1 may have a projection 91 formed on a lingual or buccal end portion thereof. At this time, the adjacent tooth has an indented portion 26, which adopts any one of a hole type 23, a scratch type 21, a dot type 22, a rectangle type 24, a pin hole type, and other types according to the shape of the projection 91 of the holding part 1.

[0069] The ground portion has a predetermined angle in order to increase holding force of the holding part 1. The coverage of the holding part 1 is changed according to holding force of a necessary amount (FIG. 24). Alternatively, the projection 91 is formed on the lingual or buccal end portion of the holding part in a state where the adjacent side of the holding part is not ground (FIGS. 31 and 32), or formed on the adjacent tooth 8 where the adjacent side is ground and the lingual and buccal sides are ended in order to maximize holding force between the lingual and buccal holding parts and the adjacent tooth (FIGS. 31 and 32). To obtain a wide holding part including the ground surface and the adjacent ground portion which require much holding force, the original model is duplicated, the duplicated model is waxed up, and a sprue is held on the duplicated model without removing the waxed-up model from the duplicated model. After that, the duplicated model is invested, burned out and cast, and then mounted) to the original model. At this time, the coverage of the ground surface, the adjacent portion, the lingual side and the buccal side is adjustable according to the form and position of the tooth. An area where much holding force is not needed, namely, an area where there are no ground portion and undercut, is waxed up on the original model. After that, the sprue is held on the waxed-up model, and the waxed-up model is invested, burned out and cast, and then, seamed to the original model. Therefore, in the above case, the duplicated model is not needed. On an area where little holding force is required, the dental prosthesis can be manufactured in such a way that the holding part is applied only to the ground portion. On an area where an aesthetic sense is required, the holding part is positioned from the ground adjacent side only to the lingual side (FIG. 20) or only at the adjacent side (FIG. 22).

[0070] On an area where does not attach importance to the aesthetic sense, the holding part 1 extends to the lingual and buccal sides (FIG. 19). Moreover, the holding part 1 may cover the non-functional cusp and a portion of the occlusal surface where there is no obstacle in occlusion in order to obtain holding force to the maximum (FIG. 24). The male member 7 attached on the holding part 1 may take one of I, L, O and T forms and other modified forms in order to obtain the maximum coupling force between the male member 7 and the female member 6. Additionally, The male member 7 attached on the holding part 1 promotes a smooth insertion of the artificial tooth 5 by keeping parallel with the lost adjacent abutment and permits the dental prosthesis to endure occlusal force and lateral force by reinforcing compression resistance. The dental prosthesis according to the present invention does not cause degeneration of the dental pulp, exposure of the dental pulp, change of the opposite tooth, and hypersensitivity since it conserves the occlusal surface as it is with little grinding amount of the tooth when the lost tooth is restored.

[0071] The artificial tooth 5 may be made of ceramic or metal material. By the above method, the lost tooth can be restored with low cost within a short operation time period, differently from the prior art crown bridge prosthesis.