Chulalongkorn University Dental Journal

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Objective The interface between denture base and hard reline resin can be improved with chemical surface treatment, methyl formate-methyl acetate (MF-MA) solution, by dissolving the relined surface.This study evaluated the effect of various MF-MA wetting times on the tensile bond strength between a non-methyl methacrylate (MMA) based reline material and denture base. Materials and Methods One hundred plates of heat-cured denture base resin (Meliodent®) were prepared according to ISO 10139-2 and randomly divided into five groups: control and four experimental groups treated with CU Acrylic Bond, MF-MA at a ratio of 25:75 by volume, for 15, 30, 60, and 180 s, respectively. The groups were applied with a non MMA-based hard reline material (Kooliner®) between two plates of denture base resin. The tensile bond strength tests were performed using a universal testing machine. Denture base specimens were analyzed by scanning electron microscopy (SEM) to determine the surface morphology. The data were analyzed using one-way ANOVA and post hoc Tukeyûs analysis at p0.05). The SEM images of the denture base groups indicated that the denture base specimens treated with MF-MA demonstrated a porous appearance compared to the control group. Conclusion Surface treatment with MF-MA increased the bond strength between denture base resin and hard reline material. However, the length of time of treatment had no effect on bond strength.



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