Systematic approach to preparing ceramic-glass composites with high translucency for dental restorations

Autor(es)

Yoshimura, Humberto N. ^[1] ; Chimanski, Afonso ^[1] ; Cesar, Paulo F. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Fed Abc, Ctr Engn Modeling & Appl Social Sci, BR-09210580 Santo Andre, SP - Brazil

^[2] Univ Sao Paulo, Sch Dent, Dept Biomat & Oral Biol, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Dental Materials; v. 31, n. 10, p. 1188-1197, OCT 2015.
• Citações Web of Science: 3

Resumo

Objective. Ceramic composites are promising materials for dental restorations. However, it is difficult to prepare highly translucent composites due to the light scattering that occurs in multiphase ceramics. The objective of this work was to verify the effectiveness of a systematic approach in designing specific glass compositions with target properties in order to prepare glass infiltrated ceramic composites with high translucency. Methods. First it was necessary to calculate from literature data the viscosity of glass at the infiltration temperature using the SciGlass software. Then, a glass composition was designed for targeted viscosity and refractive index. The glass of the system SiO2 B2O3 Al2O3 La2O3 TiO2 prepared by melting the oxide raw materials was spontaneously infiltrated into porous alumina preforms at 1200 degrees C. The optical properties were evaluated using a refractometer and a spectrophotometer. The absorption and scattering coefficients were calculated using the Kubelka Munk model. Results. The light transmittance of prepared composite was significantly higher than a commercial ceramic glass composite, due to the matching of glass and preform refractive indexes which decreased the scattering, and also to the decrease in absorption coefficient. Significance. The proposed systematic approach was efficient for development of glass infiltrated ceramic composites with high translucency, which benefits include the better aesthetic performance of the final prosthesis. (C) 2015 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 10/01003-5 - Desenvolvimento de novo método de preparação de compósitos cerâmicos infiltrados com vidro sob pressão para próteses dentárias
• Beneficiário: Humberto Naoyuki Yoshimura
• Modalidade de apoio: Auxílio à Pesquisa - Regular