RESUMO
Stains and glaze are effective procedures for achieving an aesthetic smoothness on indirect restorations. Thus, the effect of surface-etching treatments previous to the stain layer and the glaze application on the occlusal and antagonist wear of a hybrid ceramic were evaluated against different antagonists. Disc-shaped samples were prepared from polymer-infiltrated ceramic network (PICN) blocks. The specimens were divided into eight groups, according to the surface-etching treatment and glaze application: P (polished specimens); PG (polishing plus glaze); E (hydrofluoric acid etching plus stain); EG (acid etching plus stain plus glaze); A (aluminum oxide sandblasting plus stain); AG (sandblasting plus stain plus glaze); S (self-etching primer plus stain); SG (self-etching primer plus stain plus glaze). Half of the samples were subjected to a wear simulation with a steatite antagonist, and the other half was tested using a PICN antagonist. The test parameters were: 15 N, 1.7 Hz, 6 mm of horizontal sliding, 5000 cycles. The discs and the antagonists' masses were measured before and after the wear tests. The average roughness and spacing defects were evaluated. The etching treatment affected the surface and antagonist mass loss when tested against steatite. AG showed the highest mass loss. This influence was not detected when using the PICN antagonist. The glaze application after staining ensures a smoother surface and avoids antagonist wear.
RESUMO
O objetivo deste relato de caso foi descrever o tratamento restaurador de elementos posteriores com limitação de espaço interoclusal, através de uma cerâmica híbrida CAD/CAM. Paciente do sexo masculino, com 54 anos de idade, foi reabilitado com restaurações monolíticas posteriores no hemiarco superior e inferior direito através de duas inlays, uma onlay, uma overlay, uma coroa total e uma coroa endodôntica adesiva, utilizando-se bloco de estrutura híbrida. Após diagnóstico, planejamento, procedimentos operatórios especiais, preparos dentários e afastamento gengival, a aquisição de imagens, o processamento de modelos e o desenho de restaurações foram executados em um sistema CAD/CAM chairside. As restaurações foram fabricadas em uma fresadora de quatro eixos, sendo submetidas a procedimentos de acabamento, polimento e cimentação adesiva. A cerâmica híbrida para CAD/CAM constituiu-se em um material adequado para a fabricação de restaurações posteriores, com ou sem limitação de espaço interoclusal. Durante o período de acompanhamento de 36 meses, não foram observadas patologias pulpares ou perirradiculares, além de função, ajuste marginal, forma anatômica e ausência de descolorações ou pigmentações nas restaurações. Confi rmados sucesso e estabilidade do procedimento restaurador, são necessários acompanhamentos clínicos de longa duração para corroboração de resultados, assim como investigação dos efeitos sobre a dentição antagônica.
The objective of this case report was to describe the restorative treatment of posterior elements with interocclusal space limitation through a CAD/CAM hybrid ceramic. A 54-year-old male patient was rehabilitated with posterior monolithic restorations in the upper and lower right arch through two inlays, one onlay, one overlay, one total crown and one adhesive endodontic crown using a hybrid framework block. After diagnosis, planning, adhesive procedures, dental preparations and gingival displacement, the image acquisition, model processing and restorations' design were performed in a "chairside" CAD/CAM system. The restorations were fabricated in a four-axis milling machine, finished, polished and adhesively cemented. Hybrid CAD/CAM ceramics was a suitable material for the manufacturing of posterior restorations with or without interocclusal space limitation. During the 36-month followup examination, no pulp or periradicular pathologies were observed, besides function, marginal adjustment, anatomical shape and absence of discoloration or pigmentation in restorations. Confirmed the success and restorative procedure stability, longterm clinical follow-ups are necessary to corroborate the results, as well as to investigate the effects on the opposite dentition.