RESUMO
Innovative materials and application techniques are constantly being developed in the ongoing search for improved restorations. This article describes a new material and the fabrication process of aesthetic machinable ceramic anterior implant abutments. The ceramic material utilized is a mixture of alumina (aluminum oxide) and ceria (cerium oxide) with partially stabilized zirconia (zirconium oxide). The initial core material is a cylinder with a 9-mm diameter and a 15-mm height, obtained by ceramic injection and presintering processes. The resultant alumina-zirconia core is porous and readily machinable. It is secured to the analog, and its design is customized by machining the abutment to suit the particular clinical circumstances. The machining is followed by glass infiltration, and the crown is finalized. The learning objective of this article is to gain a basic knowledge of the fabrication and clinical application of the custom machinable abutments.
Assuntos
Óxido de Alumínio , Coroas , Dente Suporte , Implantes Dentários para Um Único Dente , Materiais Dentários , Zircônio , Cério , Feminino , Humanos , Pessoa de Meia-Idade , Tecnologia Odontológica/métodosRESUMO
The relationship of gingival inflammation to the pain associated with periodontal probing was assessed at baseline (B), and 1 month (1M) and 3 months (3M) later in 46 subjects. At each of the 3 sessions, clinical measures of gingival inflammation included an observational gingival index and bleeding score. In addition, periodontal probings of all existing teeth was performed with a constant force probe (25 g). Following completion of the probing at each session, subjects rated the global painfulness of the probing using a visual analog scale for pain. Results of this study showed that judged painfulness of probing was related to clinical inflammation (bleeding score) at baseline and 1 month and suggest that the degree of periodontal inflammation is related to the pain and discomfort associated with periodontal probing.
Assuntos
Bolsa Gengival/patologia , Gengivite/fisiopatologia , Dor/fisiopatologia , Periodontia/instrumentação , Adulto , Feminino , Hemorragia Gengival/fisiopatologia , Gengivite/diagnóstico , Humanos , Masculino , Medição da Dor , Índice PeriodontalRESUMO
Two major concerns characterize the difficulties encountered with prostheses on implants. 1--The difference in orientation between the implant, imposed by anatomical requirements, and the restoration anatomy. It should be kept in mind that a sufficient occlusal space is required to house the restoration. The regularization of the occlusal curve of the opposite arch, in the example given, was obtained by bonding ceramic overlays. 2--The visibility of the abutment at the gingival level. In this clinical case, after removing the old prosthesis, it is observed that the position of the screws is unsuitable, as one of them emerges into the embrasure. A solution to these problems may be found in building an intermediate screwed core. The technical protocol requires the use of long screwed transfers, a specific impression method and plastic preforms. The intermediate core is formed by the combination of two hollow dowel cores into which a conventional metal ceramic bridge is incorporated. Aesthetically speaking, the prosthetic construction is characterized by the absence of metal visibility. The use of the pterygoid bone radically transforms prosthetic indications. It is advisable that the extremity of the implant remains accessible. Linking to the restoration can be carried out with a screwed telescopic substructure. It is not necessary, at the level of the pterygoid bone situated outside the limits of the arch, to carry out any dental morphology. A smooth, polished construction situated below the plane of occlusion is sufficient.
Assuntos
Implantação Dentária Endóssea , Planejamento de Dentadura , Revestimento de Dentadura , Dente Suporte , Ligas Dentárias , Oclusão Dentária , Porcelana Dentária , Retenção de Dentadura , Prótese Total , Prótese Parcial , Estética Dentária , HumanosRESUMO
Ceramic onlays have come into much wider use and experience has led to gradual modification of preparation contours. The aim was to improve two complementary aspects, aesthetics and mechanical strength. The use of ceramics to rebuild cusps enhances the structures' mimetic effect and mechanical qualities. If an isthmus exists connecting the occlusal and proximal cavities, it must be enlarged; if not, none must be created. The use of bonded ceramic overlays offers an original therapeutic result. They are indicated in order to even out occlusal patterns.
