Resistência à flexão de resina acrílica polimerizada pela energia de microondas
Carregando...
Data
2003-06
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
Fracture strength of denture base resins of great concern in complete denture rehabilitation. Many approaches
have been used to strengthen acrylic resin dentures and new processing methods have been investigated. The
aim of this study was to evaluate the effect of two microwave curing cycles on the transverse strength of a acrylic
resin. Three groups were evaluated (A, B and C) and one type of conventional heat-cured acrylic resin was used
for all specimens (Clássico). Two groups were cured in microwave oven (Continental AW-30): Group A) 3 minu-
tes at 500W and Group B) Pre-polymerization for 13 minutes at 90W (flask on vertical position) and final
polymerization for 1.5 minute at 500W (flask on horizontal position). Group C consisted of specimens cured in
hot water bath for 9 hours at 74oC and was control group. A three point loading test was used to determine the
transverse strength of test specimens (n= 9 per group) using a mechanical testing machine (MTS-810). The
means of flexural strength (Mpa) of groups A, B and C were 101.27 (±12.31), 90.66 (±7.56) and 85.06 (±17.50)
respectively. One-way analysis of variance demonstrated significant differences between the groups, and the
Tuckey’s test showed significant differences (p<0.05) between groups A and C. It was concluded the Clássico
conventional heat-cured acrylic resin could be polymerized by microwave energy without damage to mechanical
property evaluated.
Descrição
Palavras-chave
Materiais dentários, Propriedades físicas, Polímeros, Dental materials, Polymers, Physical properties
Citação
BARBOSA, Débora Barros et al. Resistência à flexão de resina acrílica polimerizada pela energia de microondas. Ciência Odontológica Brasileira, São José dos Campos, São Paulo, v. 6, n. 2, p. 72-79, abr./jun. 2003.