MAIA, M. Z. A. A.; http://lattes.cnpq.br/7263718409120408; MAIA, Maria Zilda Albuquerque Araújo.
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.