WETTING TIME OF METHYL FORMATE-METHYL ACETATE SOLUTION AFFECTS THE TENSILE BOND STRENGTH BETWEEN DENTURE BASE RESIN AND NON MMA-BASED HARD RELINE RESINS

Abstract

This study investigated the effect of MF-MA wetting times on the tensile bond strength (TBS) between 3 non MMA-based reline materials and denture base material. Four hundred heat-cured denture base resin (Meliodent®) were prepared and randomly divided into 3 groups of hard reline resins (Kooliner®, Tokuyama® Rebase II and Ufi Gel Hard®). Each group of reline material consists of 6 - 7 subgroups (n=10), based on their surface treatment; control, adhesive, MF-MA 15, 30, 60, 180 s and MMA 180 s. The TBS test was performed using a Universal testing machine. The data were analyzed using one-way ANOVA and post hoc Tukey’s analysis at p<0.05. The mean TBS of the treated groups were significantly higher compared with those of the control group (p<0.05). In the Kooliner® group, there were no significant differences in TBS between the MF-MA and MMA treatment groups (p>0.05). In the Tokuyama® Rebase II group, application with MF-MA solutions for 180 s produced the significantly highest TBS compared with the other groups (p<0.05). In the Ufi Gel Hard®, the groups of MF-MA 180 s and MMA 180 s groups demonstrated significantly higher TBS compared with the other groups (p<0.05). Surface treatment with MF-MA solutions significantly increases the TBS between denture base resin and non MMA-based hard reline resins. This study suggests that an MF-MA wetting time of 15 s for Kooliner® and 180 s for Tokuyama® Rebase II and Ufi Gel Hard® is adequate for creating a strong bond.