33 results about "Dental Restoration Failure" patented technology

This invention relates to methods and devices for restoring teeth using fixed restorations. In particular, the invention provides a system, kit, and devices for the management of interproximal areas for traditional cementation and / or bonding of dental crowns, onlays, inlays, veneers and bridges. In the method, a barrier is positioned in contact with the tooth being restored and an adjacent tooth to cover a section of the tooth being restored and to create separation of the tooth being restored and the adjacent tooth. Cement is applied to the first mating surface of the fixed restoration and / or to the second mating surface of the tooth, and the first mating surface of the fixed restoration and the second mating surface of the tooth are positioned adjacent each other to seat the fixed restoration on the tooth. The barrier covers a section of the tooth being restored to prevent cement from bonding to the section of the tooth. This eliminates the need to remove hardened cement from this section of the tooth.

The invention provides an anatomic root-shaped implant, a dental prosthesis with the same and a method for manufacturing the dental prosthesis. The anatomic root-shaped implant comprises an implant. An abutment accommodating hole is formed in the implant, the thickness of a wall formed by the peripheral wall of the abutment accommodating hole and the periphery of the implant is larger than or equal to the preset minimum wall thickness, a cross section of the abutment accommodating hole is in a non-circular first shape, the top surface of the implant crosses the cross section of the abutment accommodating hole, the area of the first shape is larger than the area of a first circle positioned in the first shape, the circle center of the first circle is the center of the top surface of the implant, and the radius of the first circle is equal to a difference value obtained when the preset minimum wall thickness is subtracted from the minimum distance from the center of the top surface of the implant to the periphery of the implant. According to the technical scheme, the anatomic root-shaped implant, the dental prosthesis and the method have the advantage that the problem of deterioration of strength due to the fact that an anatomic root-shaped implant in the prior art is matched with an existing abutment can be effectively solved.

The invention provides a zirconia ceramic material applied to dental restoration. The zirconia ceramic material applied to the dental restoration is prepared from the following components by mole percentage: 1.5-4% of Nb2O5, 1.5-4% of SnO2 and the balance of ZrO2. The invention further provides a preparation method of the zirconia ceramic material. The preparation method comprises the following steps of (1), carrying out ball-milling on Nb2O5 powder, SnO2 powder and ZrO2 powder, uniformly mixing and screening to obtain a mixed powder; (2), carrying out isostatic cool pressing formation to obtain powder pressed blanks; and (3) carrying out pre-sintering and sintering processes to obtain the zirconia ceramic material applied to the dental restoration. According to the zirconia ceramic material applied to the dental restoration, which is disclosed by the invention, the biocompatibility is good, the health-harmful problems such as sensitivity do not exist, the mechanical property is excellent, the actual effect resistance is good, the phase change from a tetragonal phase to a monoclinic phase does not generate in a hygrothermal environment of an oral cavity, no clinic risk of exfoliation exists, and the zirconia ceramic material can be widely suitable for manufacturing dental restoration prosthesis.

The invention relates to a method for constructing tooth surfaces of a dental prosthesis and for producing dental restorations, starting from a 3D data record of an upper mandible layout and a 3D data record of a lower mandible layout, each layout comprising a number of teeth arranged in each mandibular arch and the teeth of the upper mandible layout and the teeth of the lower mandible layout at intercuspation making contact with each other at multiple contact points. The contact surfaces are selected by approximation. Relevant surface pairs lying opposite one another are identified and are incorporated by an optimization algorithm into local minimum distances, taking into consideration surfaces that can slide past one another. This allows the desired contact points to be produced. Surfaces that have not been selected are not considered in the production of the points of contact.

Dental restorations are created by preparing a hydrocolloid mold for such dental appliances as crowns and bridges. A slurry of zirconia powder and 3-O-acryloyl-D-glucose is prepared. The slurry is gelcast in the hydrocolloid mold with polymerization of the 3-O-acryloyl-D-glucose to a green body. The green body is dried and machined to the form of the dental restoration. The polymerized 3-O-acryloyl-D-glucose is then burned from the machined green body. The remaining zirconia body in the form of the dental restoration is then sintered to form the finished device.