Method of making cast metal tabs

 

(57) Abstract:

Use in medicine, particularly in prosthetic dentistry. The inventive cast metal tab is manufactured with channels whose diameter corresponds to the diameter of tubular pins and the diameter of the root canals.

The invention relates to medicine, in particular to prosthetic dentistry.

A known method of manufacturing cast metal tabs with non-parallel channels, including the preparation of the crown and root portion of the tooth with the expansion of channels to a maximum depth, the fitting pins, modeling wax artificial "stump" the crown of the tooth with the introduction through the wax composition of the primary and secondary pins, which are extracted prior to its solidification, casting stump is inserted into the channels graphite rods and its fixation with the introduction holes "stump" and canals of the tooth previously preparovanych additional pins with notches protruding ends are then cut off (Tsukanov F. N. The restoration of the destroyed crown of the tooth stump pin designs. Dentistry, 1986, No. 4, S. 68 69).

The disadvantage of this method is that t is TBE pin creates excess pressure in the fixing material, which leads to the violation of the location of the tabs. Irregularities on the inner surface of the channel in the tab after drilling graphite pin creates the conditions for loss of material in the form of chips, delay of air bubbles during leakage of cement in fixing pin. The mismatch between the diameter of the pin channel leads to resorption of the fixing material. Manipulation of the pin on the hot wax compositions make a lot of inaccuracies in her designs.

The essence of the invention lies in the fact that carry out the dissection of the crown and root of tooth parts, the modeling tab of wax, non-concurrent introduction in root channels tubular pins, the diameter of which corresponds exactly to the diameter of the root canals, casting metal tab-based wax composition is inserted in its hole tubular pins, her fixation with the introduction of holes in metal structures and canals of the tooth additional tubular pins of the same diameter, protruding ends are then cut off.

The use of tubular pins calibrated diameter matching the diameter of the root canal enforces aligned to the s during the installation of metal structures ensure the free flow of the fixing material and the removal of air bubbles, that also increases the reliability of the fixing tab. The use of tubular pins in a wax composition during casting metal construction ensures precision manufacturing tab. Casting a tab-based wax composition with inserted pins allows you to avoid the deformation.

The method is as follows.

The crown and root portion of the tooth dissect under cast metal tab by any known method. Root canals extend to the desired depth (2/3 length) endodontic instrument to the diameter of the pin. From the corresponding wax model tab. Heated tubular pins through the wax composition is introduced into the root canals. After solidification of the wax rotational movement alternately remove the pins from the tab, and the last of the prepared cavity. After drying a stream of cold air into the holes of the wax tab again insert the tubular pins so that they acted outside of not less than 2 mm on each side, set channel Gating, degreased, put the first layer of the refractory mass, Packed in a casting muffle and produce the casting. After cleaning composition from the refractory mass harass final machining, sterilized, before fixing cover fixing material. The pulp chamber and root canals are treated with medication, according to the standard technique, and evenly fill the fixing material. The tab is installed in the cavity, the surpluses fixing material and air bubbles free forced through the edges and tubular channels without creating excessive pressure in fill volume. New sterile tube pins inserted into holes on the surface of the tab and push through cement filled grooves in the root canals, the excess material and air bubbles freely pushed out through the inner hole of the pin. After crystallization fixing material pins, protruding above the surface of the tab cut diamond or vulcanicola disk. The hole of the pin remains filled with the fixing material.

As the material is better to use low-temperature alloys: silver, silver-tin, silver-palladium, gold. For pins conveniently used needles from disposable syringes. It should be emphasized that the alloy for the tab should have a lower melting temperature than the material of the STI is niravana fixing material during the fixing tab by removing it through the tubular hole tabs, and then pin provides a tight marginal seal tabs to the tissues of the tooth, the minimum number of fixing material between the tissue of the tooth and the material tab, its low volumetric shrinkage;

the arrangement of pins at different angles relative to the vertical inner surface of the tab provides a high degree of stability, the use of elastic tubular pins in the root canal provides natural load distribution in the structural hard tooth tissues and the tissues of the periodontium;

the prosthesis is a multi-rooted tooth and used to support the three pins located in the root canals eliminated by splitting the load torque in the area of the bifurcation of the roots. When the pressure on the crown portion of the load vector in the mouths of root canals is directed to the center of the bottom of the tooth cavity

the triangle formed by the holes mouths of the channels, while in the roots there is a voltage directed to their convergence, which allows to combine in one design free-standing roots of multirooted teeth with complete destruction of the tooth crown.

Method of making cast metal tab that includes dissection of coronal and root casscoe tabs her fixation with the introduction of holes in metal structures and root canals additional pins, characterized in that the modeling wax compositions, as well as by fixing a metal tab in the root canals enter the tubular pins calibrated diameter matching the diameter of the root canal, in addition, removal of the wax composition is carried out after its cooling, and casting the metal inlay perform is inserted in the wax composition of tubular pins calibrated diameter.

 

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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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