Pivot stump inlay

FIELD: medical engineering.

SUBSTANCE: device has crown part, supporting member and intra-root part. The intra-root part is formed as combination of cylindrical and conic regions. Ratio of cylindrical and conic region lengths is equal to 1-3 and one ring-shaped notches of retention point always passes through place the regions 4 and 5 join.

EFFECT: high stability of inlay position in tooth root.

21 cl, 5 dwg

 

The invention relates to medicine, namely dentistry, and can be used when the prosthesis is completely or partially lost crown of the tooth.

Famous pin stump tab (see the patent of Russia №2031637, CL.6And 61 13/30, 1993), containing the crown part, the supporting element and the root part associated with a coronal part through the support element, while the root portion is formed by a combination of cylindrical and conical sections, the surface of which is made retention points in the form of annular grooves with inclined lateral surface directed to the free end of the tab.

The main disadvantages of known construction are:

- reduced the stability of the tabs at the root of the tooth;

- invasiveness setup tab in the root canal.

The technical result is achieved from the use of the proposed design is to improve the resilience of the tabs at the root of the tooth during its operation and reduce the morbidity of its installation in the root canal of the tooth by preventing the possibility of a split root and/or perforations in the apical part.

The technical result is achieved due to the fact that the ratio of the length of the cylindrical section to the length of the conical section root part of the pin cult contribution of the key is from 1 to 3, and one of the annular grooves retention points always passes through the junction of the cylindrical and conical sections.

In addition, side surfaces of the grooves are longitudinal axis of the root portion of the angle from 10 to 30°.

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

The characteristic of the ratio of the length of the cylindrical participation to the length of the conical section is from 1 to 3" can be justified as follows:

In that case, if the ratio of the length of the cylindrical section (LC) to the length of the conical section (Lk) becomes LC/Ltoless than 1, the shape of the root of the tab approximates the shape of the wedge that leads (with the introduction of tabs in the root canal and in the course of its operation) to the occurrence of lateral forces directed from the axis tab to the inner side surfaces of the root canal, and, as a consequence, a possible split of the root.

In that case, if the ratio of the length of the cylindrical section to the length of the conical section is LC/Ltomore than 3, the shape of the root of the tab approximates the shape of the cylinder, and therefore, it is necessary in this case to prepare a landing place in the root canal (using cylindrical Canelones is rites) just under the size of the root part of the tab. Because the root of the tooth in apical part has a sharp narrowing, and the length of the cylindrical root section of the tab in some cases, you may have a length greater than 2/3 the length of the root canal in the apical part of the root may be accidental perforation that is fraught with serious complications.

In addition, the presence of cylindrical shape provides additional and removal of unwanted tissue in the root canal in the process of its expansion, which also increases the invasiveness of the surgery.

Thus, the execution of the root portion with the ratio of the length of the cylindrical section to the length of the conical section LC/Ltoequal to from 1 to 3, provides optimal load distribution on the root of the tooth, since the cylindrical section reduces load on the walls of the root canal, and the conical section, closer to the root of the tooth at apical part, prevents perforation of the root, and the thickness of the walls of the root of the tooth relative to the axis of the tab along its entire length remains constant.

With regard to the passage of one of the annular grooves retention of the item through the junction of the cylindrical and conical sections, this characteristic provides a smoothing of the sharp boundary of transition from one area to another and, consequently, eliminates unwanted pressure within cornewall of the tab at this point on the wall of the root canal, that also affects the increase sustainability and reduce trauma.

The performance of the side surfaces of the annular grooves relative to the longitudinal axis of the root of the tab at an angle of 10 to 30°it provides in this interval the maximum approximation of the form root tabs to the natural profile of the root canal of the tooth, which allows to minimize the removal of tissue in the root canal and also has an effect on reducing the morbidity and improve the resilience of the tab.

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 pin cult tab with a new set of features, which differ from the known analogs and prototypes.

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 facility. In addition, these distinctive signs are the new properties.

The device also has the possibility of practical feasibility, which is confirmed by the production of a pin cult tabs and i.e. monitoring) reference is she on the market of dental services.

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 a pin stump tab with a longitudinal groove on the crown part and the ratio of the cylindrical section to the conical section of the root part, equal to 1.5 (the best option); figure 2 - is a longitudinal section of a coronal part of the tab with a longitudinal groove; figure 3 - tab with a concave area on the crown part and the ratio of the cylindrical section to the conical section, is equal to 1; figure 4 is a tab with the retention point on the crown part and the ratio of the cylindrical section to the conical section, is equal to 3; figure 5 - tab, installed in the root canal of the tooth.

Pin stump tab consists of the crown part 1, the support element 2 and the root portion 3, while the root portion 3 is formed by combination of a cylindrical section 4 and the conical section 5. On the surface of the root portion 3 is made of retention points in the form of annular grooves 6 with inclined side surfaces 7, directed to the free end 8 of part 3. The lateral surface 7 of the grooves 6 are longitudinal axis of the root portion 3 angle from 10° to 30°; and concerning the giving of the length (L C) a cylindrical section 4 to the length (LC) conic section is from 1 to 3. One of the annular grooves 6 retention of paragraph always passes through the point 9 of the connection sections 4 and 5. In addition, two opposite sides of the crown part 1 has a longitudinal groove 10 in which each of the longitudinal grooves is formed by combination of two intersecting planes 11 angle 120°. The line of intersection of the planes 11 coincides with the axis of the copings. This configuration gives the dentist the ability to fit the profile tab to form and recover lost part of a tooth. This goal is affected by the execution of a coronal part 1 in the form of a truncated cone (Fig 1 and 3) and in the form of a cylinder (see figure 4). For maximum approximation of the shape of the crown portion 1 to form the front teeth (incisors and canines) on the side surface portion 1 is made concave section 12 with a given radius of curvature. On different versions of the coronal part 1 influenced by the coincidence of the larger side of the truncated cone 1 with the supporting element 2 (smpeg, 2, 3), and the location of the longest side at the free end of the crown part 1 (not shown).

To improve adhesion (fixing) of the artificial crown on part 1, on its lateral surface retention points in the form of terminal grooves 13 of the first profile.

To reduce trauma to the tissue of the root canal in the process of introducing tabs free end 14 root portion 3 are twisted. To ensure the angle of the side surface 7 of the grooves 6 to the longitudinal axis 10-30° depth 15 drillings 6 root part 3 is from 0.1 to 0.02 mm. To improve the fixation tabs at the root of the tooth supporting element 2 in cross section has the shape of a circle 16, and the sides of the root portion 3 is made of longitudinal grooves (not shown) for output fixing material. To facilitate the introduction of tabs in the root canal on the free end surface of the crown part 1 can be completed with the slot 17 spanner.

Pin cult tab is made from a titanium alloy or stainless steel (in rare cases, of the polymeric material), and for decorative purposes and giving her biological homogeneity may be covered with a layer of titanium nitride or zirconium nitride (fully or partially). Pin stump tab is used as follows.

Develop a root canal 18 of the tooth under the size of the root part 3 using special cutting tools (passing drill and reamer). Then perform a landing recess 19 around the entrance to the root canal (end mill) under the size of the R of the support element 2. Next produce sterilization tab and dense introduction on seat into the root canal using a fixing materials. After the installation tab in the root produce simulation, fabrication and fitting of artificial crowns 20 on the crown part of the tab 1 according to the usual method.

Manufacturer root part 1 with a ratio of the length of the cylindrical section 4 to the length of the conical section 5, is equal to from 1 to 3, provides optimal load distribution on the root 21 of the tooth, the thickness of the walls 22 of the root 21 of the tooth relative to the axis of the tab along its entire length remains constant, which prevents the split of the root and the possibility of perforation.

Thus, the proposed design pin cult tab provides a significant increase in its stability at the root of the tooth and reduces the trauma of its installation in the root canal. The tab may be recommended for wide use in prosthodontic practice in the restoration of partially or completely destroyed coronal part of a tooth.

1. Pin stump tab that contains the root portion, the supporting element and the root part associated with a coronal part through the support element, while the root portion is formed by a combination of cylindrical and conical sections, the surface is made of retention points in the form of annular grooves with inclined side surfaces, directed to the free end of the root portion, characterized in that the ratio of the length of the cylindrical section to the length of the conical section is from 1 to 3, with one of the annular grooves retention points always passes through the junction of the cylindrical and conical sections, and side surfaces of the grooves are longitudinal axis of the root portion of the angle from 10 to 30°.

2. Tab according to claim 1, characterized in that two opposite sides of the crown are made of longitudinal grooves.

3. Tab according to claim 2, characterized in that each of the longitudinal grooves is formed by combination of two intersecting planes at an angle 120°and the line of intersection of planes coincides with the axis of the inlay.

4. Tab according to claim 1, wherein the crown portion is made in the form of a truncated cone.

5. Tab according to claim 1, wherein the crown portion is made in the form of a cylinder.

6. Tab according to claim 4, characterized in that on the side surface of the crown portion is made concave area with a specified radius of curvature.

7. Tab according to claim 4, characterized in that the large side of a truncated cone coronal part coincides with the reference element.

8. Tab according to claim 4, characterized in that the large side of a truncated cone is located at the free end the coronal part.

9. Tab according to claim 1, characterized in that the diameter of the support element is larger than the diameter of the crown part.

10. Tab according to claim 1, characterized in that the crown made of retention points in the form of annular grooves of different profile.

11. Tab according to claim 1, characterized in that the free end of the root portion is made rounded.

12. Tab according to claim 1, characterized in that the depth of the annular grooves on the root part is from 0.1 to 0.02 mm

13. Tab according to claim 1, characterized in that the supporting element in the cross section is circular.

14. Tab according to claim 1, characterized in that the lateral surface of the root portion is made of longitudinal grooves for output fixing material.

15. Tab according to claim 1, characterized in that the free end surface of the crown part is made a slot for spanner.

16. Tab according to claim 1, characterized in that it is made of titanium alloy.

17. Tab according to claim 1, characterized in that it is made of stainless steel.

18. Tab according to claim 1, characterized in that it is made of polymer material.

19. Tab according to claim 1, characterized in that it has a coating of zirconium nitride.

20. Tab according to claim 1, characterized in that it has a coating of titanium nitride.

21. Tab on PP, 20, characterized in that the coating Nan is prohibited only on the crown part.



 

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Pivot stump inlay // 2250090

FIELD: medical engineering.

SUBSTANCE: device has crown part, supporting member and intra-root part. The intra-root part is formed as combination of cylindrical and conic regions. Ratio of cylindrical and conic region lengths is equal to 1-3 and one ring-shaped notches of retention point always passes through place the regions 4 and 5 join.

EFFECT: high stability of inlay position in tooth root.

21 cl, 5 dwg

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

FIELD: medical engineering.

SUBSTANCE: method involves placing wire network reinforcement pin in composite material medium applicable for restoring crown tooth part to enable solid connection of retained tooth part and one under restoration as well as additional restored tooth reinforcement to take place. The pin has U-shaped part for reinforcing crown tooth part under restoration and a part used for fixing it that is manufactured as a bundle of free longitudinal wire ends of metal net and surface counterpart surface of the cavity formed in base of tooth root and retained crown tooth part.

EFFECT: high strength under chewing loads applied; retained anatomical natural tooth shape and appearance.

FIELD: medical engineering.

SUBSTANCE: method involves preparing dental supraradical part and canal, taking double imprint, molding gypsum model, modeling the pin and insert with wax on the model, substituting the wax pin insert with metal one, fitting and fixing the insert on the tooth. Tooth root bottom is prepared as hemisphere and the pin tip is modeled from wax of the same shape. Stump part of the insert is modeled to give it lateral surface convergence angle from 5 to 10° towards the median tooth axis.

EFFECT: facilitated modeling process.

2 cl, 4 dwg

FIELD: medical engineering.

SUBSTANCE: device has perforated plate or metal wire network plate. Pin has reinforcing part manufactured as curve plate and fixing part matching root base cavity in shape and fastening member. The reinforcement pin is fixed in root canal with a fastening member manufactured from twisted metal threads passed through fixing part of the pin. The crown tooth part is formed on the reinforcing pin part from composite material.

EFFECT: retained anatomical natural tooth shape and appearance; retained crown part.

FIELD: medicine.

SUBSTANCE: method involves using metal or gold-plated square net having side not longer than root canal. The net is shaped as a surface coupled with root base cavity surface and fixed with cement. Wires located in the net square perimeter zone are used for reinforcing the crown part. Wires are not as long as twice the crown part height. The wires are fixed on the internal surface of artificial enamel layer produced in advance in conformance with anatomical tooth shape. Their free ends are bent placed in root part cavity in artificial dentine layer. The artificial enamel layer and chewing tooth surface are produced from macrofilled composite and artificial dentine from microfilled composite.

EFFECT: high strength of restored tooth; enhanced effectiveness of restoration in the cases when pin structures are not indicated; long service life under chewing loading.

FIELD: medicine; medical engineering.

SUBSTANCE: device is manufactured from rectangular plate being metal net or perforated plate. To form reinforcing or fixing pin part, plate sides are joined along the length to give curved shape to the plate. One of plate ends is additionally bent to give form matching counterpart surface of cavity produced in root base. U-shaped prefabricated metal threads are conducted through holes in the fixing part. The threads are paired by twisting. The fixing part of the pin and the so produced fastening member are rigidly connected.

EFFECT: simplified production process; high strength of restored tooth crown part.

2 dwg

FIELD: medicine.

SUBSTANCE: method involves applying endodontic treatment of root, forming cylindrical cavity in root canal and shock-absorbing cavity on its base, forming reinforcement pin and ring-shaped crown carcass from gold-coated metal gauze. Root pin part is fixed in root canal after having restored artificial enamel layer from macrofilled composite material in correspondence with single-root premolar anatomical structure and fixing reinforcing carcass on internal surface formed by enamel layer. The tubular root part has longitudinal slit and free gauze wires at the end. The pin part above the root made as free gauze wires in the root part is fixed on the shock-absorbing root cavity surface. The root portion of the pin is formed in conformance with canal cavity shape. Root part length and length of part above the root is selected no to be less than 1/3 of root canal length and not less than less than double-length of the shock-absorbing root base cavity. Crown cavity is layer-by-layer filled with macrofilled composite material. Chewing surface tubercles is restored from macrofilled composite material corresponding to anatomical tooth shape.

EFFECT: retained tooth root as base for making prosthesis ; high strength and stability of the pin and repaired tooth; simplified pin design.

FIELD: medical engineering.

SUBSTANCE: device has conic shape. Cavity is coaxial with the pin. Through holes are arranged in chess-board order along pin body with one through hole at each of eight levels. Hole diameters are 0.6 mm large, their level pitch is equal to 1.6 mm, pin cavity volume is equal to 2.6 mm3 and wall thickness is equal to 0.3 mm.

EFFECT: high strength, sealed, stable color structure giving improved cosmetic results.

1 dwg

FIELD: medical engineering.

SUBSTANCE: device has non-aggressive tip and grooves on external surface. Conic cavity is coaxial with the pin. The conic cavity has insert stump protruding above pin head part. Cavity wall and insert are threaded. The grooves pass through pin body to 3/4 of its length in plane passing through pin center. The protruding insert portion has retention points.

EFFECT: high strength, sealed, stable cosmetic results; exactly repeated tooth root canal shaped.

1 dwg

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