Effect of microwave disinfection on the surface roughness of three denture base resins after tooth brushing

Autor(es)

Izumida, Fernanda Emiko ^[1] ; Ribeiro, Roberta Chuqui ^[1] ; Giampaolo, Eunice Teresinha ^[1] ; Machado, Ana Lucia ^[1] ; Pavarina, Ana Claudia ^[1] ; Vergani, Carlos Eduardo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista, Dept Dent Mat & Prosthodont, Sch Dent, BR-14801903 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: GERODONTOLOGY; v. 28, n. 4, p. 277-282, DEC 2011.
• Citações Web of Science: 8

Resumo

Objective: This study investigated the effect of microwave disinfection on the roughness of three heat-polymerised acrylic resins after tooth brushing. Background: Microwave disinfection has been recommended to reduce cross-contamination. However, this procedure may also influence the physical and mechanical properties of acrylic resins. Materials and methods: Specimens (40 x 20 x 2 mm) of resins: Lucitone 550 (L), QC 20(QC) and Acron MC (A) were prepared and divided into four groups (n = 10): Control groups 1 (C1) and 2 (C2) stored in water for 48 h or 7 days; Test groups 1 (MW2) and 2 (MW7) stored in water for 48 h and disinfected (650 W for 6 min) daily for 2 or 7 days, respectively. After treatments, the specimens were placed in a tooth brushing machine at a rate of 60 reciprocal strokes per minute. The specimens were brushed with 20 000 strokes, which represent approximately 2 years of denture cleansing. The surface roughness (Ra) was evaluated before and after the tooth brushing. Data were analysed by two-way anova and Tukey Honestly Significant Difference (HSD) post hoc tests (alpha = 0.05). Results: The data revealed significant changes between test groups for A and L resins. Comparison among resins revealed that for MW7, the roughness of A was significantly lower than that of L. After the seven microwave cycles, it could be seen that the roughness values of QC were significantly lower than those of L. Conclusions: The roughness of QC after brushing was not significantly affected by microwave disinfection. For A and L, seven microwave cycles resulted in increased roughness. (AU)

• Processo FAPESP: 04/03821-6 - Efeito de desinfecções sucessivas em microondas na resistência à abrasão por escovação de três resinas termopolimerizáveis para bases de próteses
• Beneficiário: Fernanda Emiko Izumida
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica