Development of new preparation method of glass infiltrated ceramic composites under pressure for dental prostheses

• Grant number: 10/01003-5
• Support Opportunities: Regular Research Grants
• Start date: November 01, 2010
• End date: October 31, 2013
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal Investigator: Humberto Naoyuki Yoshimura
• Grantee: Humberto Naoyuki Yoshimura
• Host Institution: Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas (CECS). Universidade Federal do ABC (UFABC). Ministério da Educação (Brasil). Santo André , SP, Brazil
• Associated researchers: Marcelo Mendes Pinto ; Paulo Francisco Cesar

Abstract

In the last years, many bioceramics and processing methods for all-ceramic prosthesis have been developed, because these materials can result in dental restorations with improved biocompatibility, chemical stability, and aesthetic qualities compared to metals and polymers restorations. The market of dental bioceramics is growing rapidly in Brazil and abroad. Despite the recent developments, bioceramics used as core materials still need to be improved in relation to their optical characteristics as well as to their mechanical properties. The aim of this project is to develop a new method of preparation of ceramic composites infiltrated with glass with improved optical transmission and high mechanical properties for use in dental prostheses. A new method for the production of cores of ceramic-glass composites is proposed, in which the infiltration of the glass in the partially sintered perform is conducted under pressure. This method is a hybrid technique between the systems In-Ceram Vita Zahnfabrik) and Empress (Ivoclar). Using this method, it is expected to develop translucent composites by decreasing the porosity and matching the optical characteristics of the phases present in the microstructure to minimize the light scattering. To achieve this objective, the proposed targets are: 1) develop glasses with high refraction indexes, comparable to those of the reinforcing ceramic phases; 2) develop ceramic composites infiltrated with glass under pressure; 3) study and understand the optical phenomena of light scattering of the new composites using the Kubelka-Munk model; and 4) characterize the mechanical properties of composites. This proposal is related to the goals of the project CNPq's Research Productivity Fellowship (level PQ-2) of the applicant entitled ‘Ceramics, composites and glasses with high optical and mechanical performances for dental prostheses’, which was recently approved for the triennium 2010-2013. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

YOSHIMURA, HUMBERTO N.; CHIMANSKI, AFONSO; CESAR, PAULO F.. Systematic approach to preparing ceramic-glass composites with high translucency for dental restorations. Dental Materials, v. 31, n. 10, p. 1188-1197, OCT 2015. (10/01003-5)

CHIMANSKI, AFONSO; CESAR, PAULO FRANCISCO; YOSHIMURA, HUMBERTO NAOYUKI. Effects of glass chemistry on the optical properties of highly translucent alumina-glass biocomposites for dental restorations. CERAMICS INTERNATIONAL, v. 43, n. 16, p. 13970-13977, NOV 2017. (10/01003-5)

CHIMANSKI, AFONSO; CESAR, PAULO FRANCISCO; FREDERICCI, CATIA; YOSHIMURA, HUMBERTO NAOYUKI. Evaluation of glass viscosity of dental bioceramics by the SciGlass information system. CERAMICS INTERNATIONAL, v. 41, n. 8, p. 10000-10009, SEP 2015. (10/01003-5)