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Effect of Methyl Formate-methyl Acetate Treatment on the Tensile Bond Strength between Denture Teeth and Denture Base Resin
Acrylic denture teeth, Acrylic denture base, Tensile bond strength, Surface treatment
The aim of this study was to examine the tensile bond strength between two types of acrylic denture teeth
and a heat-polymerized acrylic denture base after being treated with acrylic denture base liquid or methyl formatemethyl
acetate (MF-MA) solutions. Conventional denture teeth and highly cross-linked denture teeth were polished
at the ridge lap surface and then randomly divided into 12 groups. Groups 1 and 7 were control groups. Groups 2
and 8 were treated with acrylic denture base liquid (MMA) and the remaining groups were treated with MF-MA
solutions at various concentrations (25:75, 40:60, 55:45, and 70:30 % v/v). Heat-polymerized acrylic resin was bonded
to the denture teeth. Small dumbbell-shaped specimens were prepared and tensile bond strength testing was
performed. The data was analyzed using two way ANOVA and one way ANOVA where significant differences in the
groups were found, individual means were compared with the Tukey test at a 95 % confidence level. The surface
treated groups demonstrated higher tensile bond strengths than the untreated groups (p<0.05), except for the 70:30
% v/v group. Within each surface treatment group, the type of denture teeth had no effect on bond strength
(p>0.05). This study suggests the application of acrylic denture base liquid or a MF-MA solution (25:75, 40:60, or
55:45 v/v) before packing the acrylic resin can increase the bond strength between denture teeth and the denture