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Updated: Jun 4, 2026
Impact of Fabrication Techniques and Polishing Procedures on Surface Roughness of Denture Base Resins
Published on: January 17, 2025
Effect of microwave disinfection on the surface roughness of three denture base resins after tooth brushing
Fernanda Emiko Izumida1, Roberta Chuqui Ribeiro, Eunice Teresinha Giampaolo
1Department of Dental Materials and Prosthodontics, Univ Estadual Paulista,Araraquara, Dental School, UNESP, Araraquara - SP, Brazil.
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 × 20 × 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 (α = 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.
