Resistencia ao impacto da união dente-resina acrilica sob efeito da desinfecção simulada por energia de microondas / Effect of simulated microwave disinfection on bond strength of acry teeth and denture base resins

AUTOR(ES)

Leandro Cardoso

DATA DE PUBLICAÇÃO

2009

RESUMO

The aim of this study was to evaluate the effect of microwave disinfection in bond strength of acrylic teeth and a denture base resin. A hundred sixty rectangular wax patterns (30x15x5mm) were embedded in flasks with type III dental stone. After cristalization, the resulting moulds were filled with laboratorial silicone (Zetalabor), in which a molar acrylic tooth was included (36 Biotone IPN Vita) using a cylindrical wax (6x25mm) to join to the tooth base. The set was invested using laboratorial silicone and type III dental stone. After 1 hour, the flask was opened, the cylindrical wax removed from the tooth. Teeth were adapted in the moulds with the ridge laps submitted previously to the following treatments: 1 - no treatment; 2 -bur abrasion; 3 - bur grooving, and 4 - etched by monomer. Eighty rods of the Clássico acrylic resin atached to the tooth ridge lap were polymerized in bath cycle at 74ºC for 9 hours and deflasked after flask cooling, and 80 of Onda-Cryl acrylic resin were polymerized in 900W-domestic microwave oven following manufacturer s instructions. Specimens were deflasked after bench cooling. Fourty specimens of each acrylic resin were submitted to microwave disinfection, in a domestic oven at 650W for 3 minutes, individually immersed in 150mL of water. Other specimens were not disinfected (control). Specimens were stored in water at 37oC for 24 hours before impact test. Charpy impact strength test was performed using an impact testing machine (Otto Wolpert Werke) calibrated to 40 kpcm. Data were submitted to analysis of variance and Tukey s test at 5% of significance level. Different treatments on tooth ridge lap promoted different effects in the tooth-resin bond strength, in both conditions of simulated disinfection by microwave energy

ASSUNTO(S)

acrylic resins artificial tooth resinas acrilicas protese dentaria

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