RU2071290C1 - Method to prepare soldered metal-plastic tooth prosthesis - Google Patents

Abstract

FIELD: medicine, stomatology. SUBSTANCE: retention layer is applied upon frontal surface of cross-linkage soldered carcass from powder of 80-100 mcm dispersity, for the rest surface - from powder of 40-60 mcm dispersity, metal carcass is wholly covered with plastic material. The method could be used at any contraindications for conventional prosthesis, for example in case of parodontosis I and II or other pathological changes. EFFECT: higher efficiency.

Description

 The invention relates to the field of dentistry, more specifically to orthopedic dentistry, and can be used for dental prosthetics.

 Known combined dental crown, in which the retention element of simplification is made in the form of a recess for the intermediate and facing layers. The intermediate layer is a plasma-sprayed layer of porous aluminic acid ceramics that can directly bind to the facing layer. However, the disadvantage of this method is that the facing layer is applied only to the frontal surface of the dental crown, which reduces the aesthetic appearance of the prosthesis.

 The main objective of the invention is to reduce the time and complexity of manufacturing dentures, reducing costs, and improving their appearance.

 The use of powder of different dispersion allows you to create different porosity, which is important for fixing the facing layer. Greater porosity obtained from the front surface is necessary to obtain greater strength. The use of a soldered bridge-like frame instead of a solid-cast one makes it possible to fabricate a metal-plastic prosthesis even in cases when prosthetics by other methods is practically impossible, for example, with periodontal disease and the pathological ratio of dentition. Plastic coating on all sides significantly improves the aesthetic appearance of dentures. On the remaining surface of the metal frame, the retention layer is sprayed from a powder of lower dispersion (40-60 microns). This technology allows for less preparation of the tooth, which is important for better fixation of the denture, since a cast crown with pearls is thicker than a stamped crown with a sprayed retention layer.

 The essence of the invention lies in the fact that a retention layer consisting of NiCr powder was applied to the bridge solder prosthesis by plasma spraying. To apply the retention layer on the front surface, NiCr powder with a dispersion of 80–100 μm was used, and on the rest of the surface with a dispersion of 40–60 μm. SINMA-M plastic was used as a plastic mass.

 Example: The abutment teeth were dissected under a bridge, and preparation is possible on non-depressed teeth, and the cervical part of the tooth was treated under anesthesia. The tooth tissues were evenly removed from all sides, and the incisal edge was sharpened more. Details of casts with stomalgin according to the general methodology from prepared teeth and from the teeth of antagonists. Models were cast and the dental technician modeled the support crowns. The crown, which will be veneered on all sides in the region of the cutting edge and chewing surface, was not restored, but was stamped according to the usual method, then the stomalgin was tried on and cast to model intermediate and artificial teeth. The model was cast and the artificial facet teeth were modeled, removing as much visible metal as possible (chewing surface and cutting visors) from the wax, and the presence of loops on the facets to fix the plastic is not necessary. The obtained wax model was cast from metal and soldered with supporting crowns, after which the finished bridge was subjected to sandblasting.

 An adhesive sublayer of NiCr with a thickness of 30 μm was applied to the metal frame of the bridge brazed prosthesis, moreover, on the front surface of NiCr powder with a dispersion of 80 to 100 μm, and on the rest of the surface of the powder with a dispersion of 40 to 60 μm. Crowns that were not covered with plastic were screened and no retention layer was applied to them. The retention layer was also not applied to the surface of the bridge, which is adjacent to the body of the jaw (the inner surface of the prosthesis). Then the prosthesis was degreased, a topcoat (coating) was applied, applied to this type of plastic, dried and applied plastic according to a known method.

 Further processing of the plastic (grinding and polishing) was carried out in the usual way.

 The proposed method can be used in cases where there are any contraindications to prosthetics (for example, periodontal disease of I and II art. Pathological ratios of the series), because there are no contraindications for it. With pathological deviations of the dentofacial system, if the clinical height of the crown is small, the cast prosthesis is poorly fixed. In this case, you can apply the bridge solder prosthesis according to the proposed method, which, in addition, is significantly (approximately 3 times) cheaper than cast.

 The proposed method provides a more mobile correction of defects that occur in the prosthesis during operation. The manufacture of the prosthesis according to the proposed method allows for gentle preparation of teeth for prosthetics (it is possible to make a crown on an unseparated tooth, there is no need to retract the gums, as is done in the manufacture of a cast prosthesis). In addition, preparatory work (making an impression, model of a tooth) is less labor-consuming and significantly (approximately 7 8 times) cheaper than when manufacturing an integral cast prosthesis.

Claims (1)

 A method of manufacturing a brazed metal-plastic denture, including the manufacture of a mold, applying to the surface of a metal frame by plasma spraying a retention layer followed by applying a plastic mass, characterized in that the retention layer on the front surface of the bridge-shaped brazed frame is applied from a dispersion powder of 80 to 100 microns, the rest the surface of the powder dispersion of 40-60 microns, and the plastic mass completely cover the metal frame.