Preparação de substratos cerâmicos a partir de aluminas nacionais infiltradas com vidro para aplicação em prótese dentária.

Abstract

In dentistry, ceramics are considered an excellent alternative for restorative treatment of dental structure due to its biocompatibility, flexure strength, dental tissue-like thermal conductivity, marginal integrity, color stability and mainly for its excellent potential to simulate tooth appearance. The aim of the present work is to evaluate the microstructural and mechanical properties of infiltrated glass alumina substrates for dental prosthesis application. Firstly, both mineralogical composition and granulometry of the different alumina were characterized. Secondly, samples were prepared in accordance with a method provided by one of the raw material suppliers. Flexure strength and hardness were carried on these samples in order to evaluate their proper characteristics for dentistry use. The substrates had their morphology and fracture surface characterized by Scanning Electron Microscopy. It was observed that the microstructure was composed with approximately 75% of alumina with lanthanum glass pores infiltration.. The optical coherent tomography provided the samples evaluation by optical characterization based on the laser scattering coefficient. Internal failures of about 50um were revealed with precision in a not invasive or destructive way, hence, with no need for extra samples preparation.