Influence of storage period and effect of different brands of acrylic resin on the dimensional accuracy of the maxillary denture base

• Autor(a) principal: Miéssi, Ana Carolina
• Data de Publicação: 2008
• Outros Autores: Goiato, Marcelo Coelho [UNESP], Santos, Daniela Micheline dos [UNESP], Dekon, Stefan Fiuza de Carvalho [UNESP], Okida, Ricardo Coelho [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1590/S0103-64402008000300005; http://hdl.handle.net/11449/70710
• topic: Denture base; Dimensional change; Packing methods; Post-pressing time; acrylic acid resin; biomedical and dental materials; onda cryl; polymer; QC 20 (denture base resin); vipi cril; vipi wave; water; wax; chemistry; comparative study; dental care; denture; heat; human; materials testing; microwave radiation; surface property; temperature; time; tooth brushing; Acrylic Resins; Dental Casting Technique; Dental Materials; Dental Models; Dental Polishing; Denture Bases; Denture Design; Denture, Complete, Upper; Hot Temperature; Humans; Materials Testing; Microwaves; Polymers; Surface Properties; Temperature; Time Factors; Water; Waxes

The aim of this study was to evaluate the dimensional changes of denture bases made from different resins after different storage periods. For this purpose, 25 sets of plaster models/resin bases were prepared using 4 acrylic resins submitted to two types of polymerization: 1- QC-20 submitted to polymerization by microwave energy; 2- QC-20 submitted to polymerization by water hot bath; 3- Vipi Cril submitted to polymerization by water hot bath; 4- Vipi Wave submitted to polymerization by microwave energy; and 5- Onda Cryl submitted to polymerization by microwave energy. After polymerization, the specimens were sectioned for accuracy readings using a comparison microscope. Readings were taken at 3 points: the crests of the right (A) and left (B) ridges, and the median region of the palate, in 4 different periods. The data obtained were submitted to two-way ANOVA and Tukey's test at 5% significance level. The greatest distortions were found in the posterior palatal region of the base (M), with statistically significant difference (p<0.05) for the studied resins. All acrylic resins presented dimensional changes and the storage period influenced these alterations.