Systematic approach to preparing ceramic-glass composites with high translucency for dental restorations
| Autor: | Afonso Chimanski, Paulo Francisco Cesar, Humberto Naoyuki Yoshimura |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Ceramics
Materials science Light Scattering Composite number Light scattering Viscosity Dental Materials Mechanics of Materials Spectrophotometry visual_art Materials Testing Transmittance visual_art.visual_art_medium General Materials Science Ceramic Composite material Porosity General Dentistry Refractive index |
| Zdroj: | Dental materials : official publication of the Academy of Dental Materials. 31(10) |
| ISSN: | 1879-0097 |
| Popis: | 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 SiO 2 –B 2 O 3 –Al 2 O 3 –La 2 O 3 –TiO 2 prepared by melting the oxide raw materials was spontaneously infiltrated into porous alumina preforms at 1200 °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. |
| Databáze: | OpenAIRE |
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