Intra-root pivot tooth

FIELD: medical engineering.

SUBSTANCE: device has crown part, intra-root part and hollow fixing root part. The cylindrical fixing root part has open-end surface turned towards the intra-root part. Cylinder axis coincides with intra-root part axis. Ratio of internal diameter of the fixing root part to intra-root part diameter in front of fixing root part generatrix is equal to 1.5-6.5.

EFFECT: increased fixation reliability.

21 cl, 3 dwg

 

The invention relates to medicine, namely dentistry, and can be used in prosthetics lost crown of the tooth.

Known root splint the tooth (see the patent of Russia №2095031, class. And 61 13/30, 1992), containing the crown and root portion mounted coaxially to each other, and the hollow root of the catch between the crown and root portions and having an open end surface facing the root part, the root lock is a cylinder whose axis coincides with the axis of the root.

The main disadvantage of the known construction is that it does not provide a secure hold on the root of the tooth, as the ratio of the size of the installation design (inner diameter of the root lock and the diameter of the root part) may not correspond to the boarding section dimensions of the root.

The technical result is achieved from the use of the proposed design is to increase the reliability of fixing the root pin the tooth on its seat by ensuring the optimum ratio of inner diameter of the root of the clamp to the root diameter part of the pin tooth.

The technical result is achieved due to the fact that the internal is of Imatra (D) the root of the clamp to the diameter (d) of the root portion, lying opposite generatrix of the latch, is from 1.5 to 6.5.

The rationale for a causal link between the technical and the characteristics of the main claim.

When the ratio of the inner diameter (D) of the root of the clamp to the diameter (d) root part of more than 6.5, the inner diameter of the retainer may be longer than the mesial-distal axis of the cross section of the tooth root, as this will cause injury to the surrounding root tissues of the periodontium and the impossibility of installation of an artificial crown on a design. In addition, the reduction of the diameter of the root portion to the above ratio will lead to a sharp decrease of the strength characteristics of the structure, and consequently, to the loss of its stability at the root of the tooth.

When the ratio of the inner diameter (D) of the clamp to the diameter (d) of the root portion is less than 1.5, it will be difficult to formation on the root of the tooth boarding cylindrical projection below the root lock, and increasing the diameter of the root portion to the above ratio will require a considerable expansion of the root canal, and as a consequence, to a dramatic thinning of the walls of the landing ledge, which will significantly reduce the retention properties of the structure.

Thus, the optimal ratio of diameter (D) of the root of the clamp to the diameter (d) inside the root portion can be considered as the ratio lying in the interval from 1.5 to 6.5.

The exact ratio D/d selects the dentist just before your surgery preparation of the planting bed at the root of the tooth, depending on the size of the cross section of the root and treatment method.

Other topics included in the dependent claims, reinforce the above technical result.

The novelty of the proposed technical solution is that the new design of the root pin tooth with a new set of features that differ from the prototype.

All the characteristics of the item and included in the claims are significant, because only through their combination achieves the technical result that is expected from the use of the proposed design.

In addition, these distinctive signs are the new properties.

The device also has the possibility of practical feasibility.

Thus, this solution meets the criteria of the invention of “novelty”, “industrial applicability” and “inventive step”.

The invention is illustrated by drawings, where figure 1 shows root splint the tooth with the root lock; pin the tooth with the root lock; figure 2 - is a special circular cutter (trepan) to prepare what and the root of the tooth landing ledge under the root of the latch; figure 3 - root splint the tooth is mounted on the mounting protrusion of the tooth root.

Root splint the tooth contains the crown part 1, the root part 2, mounted coaxially to each other, and the hollow root of the retainer 3, located between the crown and root parts 1, 2. The latch 3 has an open end surface 4 facing to the root portion 2, and has the shape of a cylinder whose axis coincides with the axis of the root portion 2. Basic mounting dimensions pin tooth are the inner root diameter D of the retainer 3 and the diameter d of the root part 2 lying opposite generatrix 5 release 3, with D/d should be from 1.5 to 6.5.

Root portion 2 is formed by combination of a cylindrical section 6 and the conical section 7, and the cylindrical section 7 is located opposite generatrix 5 root retainer 3.

At the root of part 1 of the tooth can be performed retention paragraphs 8 for better fixation of the artificial crown. Retention points 8 usually have the form of annular grooves 9 different profile.

At the root part 2 also performed the retention points 10 in the form of annular grooves 11 with the inclined side surface 12, and the angle of these surfaces 12 with the axis of the root portion 2 at the corner of 10° to 30°. Yes the full value of the interval most approximates the shape of the root portion 2 to the natural profile of the root canal. For maximum approximation of the shape of the crown portion 1 to form the front teeth (incisors and canines) on the side surface of the crown portion 1 has a beveled section 13 with a given (specific) radius of curvature. To improve the fixation of the crown part 1 landing on the ledge 14 of the tooth root, 5 forming the retainer 3 can be performed through the channels 15 to exit the fixing material (glue, cement etc).

Depending on the methods of treatment and specific targets for restoration of the lost crown of the tooth, the dentist can use root splint the tooth with different profile and shape of the crown portion 1, for example, in the form of a truncated cone, or cylinder, or sphere (for installation of removable dentures).

Root splint the tooth may be made of titanium alloy or stainless steel and having on its surface a coating of titanium nitride or zirconium nitride.

Install root splint the tooth as follows.

Before installing the dentist evaluates the condition of the root, the dimensions of its cross section and the diameter of the root canal. Then choose the installation dimensions of the helical tooth, guided by the fact that the ratio of the inner diameter D of the root of the clamp to the diameter d of the root part should be in predlahat of 1.5 to 6.5. After selecting pin of the tooth is necessary designs, shapes and sizes produce mechanical treatment of the root canal 16 under the root part 2 pin tooth. This operation is performed by a set of special drills. The final drill bit diameter greater than the diameter d of the root portion 2 of about 0.05 mm. After that make alignment of the base 17 of the tooth root using mechanical cutters, and then are forming around the entrance to the root canal 16 of the circular groove 18, the inner diameter of which is equal to the diameter D1special circular cutters and less than the root diameter D of the retainer 3 of about 0.05 mm. This operation is carried out with special circular cutter (smfh), which has an angled cutting teeth 19 and the guide rod 20, which is inserted into the root canal and centers the cutter relative to the work surface. The height of the rails 21 of the hollow circular cutter is equal to the depth of the formed her circular groove 18. After that, the doctor may remove bone around a circular groove 18 from the periphery to the center for the future of artificial crowns. To prevent injury to the mucous tissue of the root, you can use a special thin plate that is placed between the tissue of the alveolar ridge and the deleted fragment. Before installing the pin tooth produce filling Korn is the first channel of the fixing material. It also put on a free basis landing ledge 14 and on its lateral surface. Installation of helical tooth is carried out by introducing a root portion 2 in the prepared root canal with simultaneous installation root of the retainer 3 on the landing ledge 14 and dense its pressing on the landing.

Thus, the proposed design is tightly covers the prepared bone bed at the root of the tooth, permitting discharge of the root canal of the tooth and removing the split root.

Due to the optimum ratio of inner diameter D of the root of the clamp to the root diameter d of the pin part of the tooth is achieved a significant increase in the reliability of the fixing structure at the root. In addition, compliance with all sizes of pin tumbler construction with applied tools, enables you in just a few minutes to prepare the abutment surface on the root of the tooth, eliminating the chance of error.

The proposed design of the helical tooth is recommended for wide application in dental practice to restore the lost natural tooth crown and as supports for dentures.

1. Root splint the tooth, which contains pulp chamber and root portion mounted coaxially to each other, and the hollow root of the catch between the crown and nutricare the second parts and having an open end surface, facing to the root part, the root lock is a cylinder whose axis coincides with the axis of the root portion, characterized in that the ratio of the inner diameter of the root of the clamp to the diameter of the root part lying opposite generatrix of the latch, is from 1.5 to 6.5.

2. The tooth according to claim 1, wherein the root portion is formed by a combination of cylindrical and conical sections.

3. The tooth according to claim 2, characterized in that the cylindrical section is located opposite the forming the root of the lock.

4. The tooth according to claim 1, characterized in that the crown made of retention points.

5. The tooth according to claim 1, characterized in that on the root part is made of retention points.

6. The tooth according to claim 4, characterized in that the retention points on the crown part is made in the form of annular grooves of different profile.

7. The tooth according to claim 5, characterized in that the retention points on the root part is made in the form of annular grooves.

8. The tooth according to claim 7, characterized in that the annular grooves have inclined side surfaces directed toward the free end of the root.

9. The tooth of claim 8, wherein the inclined side surfaces of the grooves are longitudinal axis of the root portion of the angle from 10 to 30°.

10. C is B. according to claim 1, characterized in that on the side surface of the crown portion is made sloping plot with a given radius of curvature.

11. The tooth according to claim 1, characterized in that the entire root portion is made in the form of a cylinder.

12. The tooth according to claim 1, characterized in that for forming the root of the latch is made through channels to the output fixing material.

13. The tooth according to claim 1, wherein the crown portion is made in the form of a truncated cone.

14. The tooth according to claim 1, wherein the crown portion is made in the form of a cylinder.

15. The tooth according to claim 1, wherein the crown portion is made in the shape of a ball for the installation of removable denture.

16. The tooth according to claim 1, characterized in that on the side surface of the crown portion is made of longitudinal grooves for output fixing material.

17. The tooth according to claim 1, characterized in that the free end surface of the crown portion is made hollow threaded channel for fixing the lock screw element denture.

18. The tooth according to claim 1, characterized in that the helical tooth is made of titanium alloy.

19. The tooth according to claim 1, characterized in that the helical tooth is made of stainless steel.

20. The tooth according to claim 1, characterized in that on the surface of the helical tooth coated with titanium nitride.

21. The tooth according to claim 1, characterized in that on the surface of the pin is UBA a coating of zirconium nitride.



 

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