Evaluating Shear Bond Strength of Various Surface Treatments of Multilithic Teeth to Denture Base Acrylic Resin

Debonding of artificial teeth from denture base resin is regarded as a considerable problem for the patients who wear dentures. Utilizing multilithic teeth has not yet managed to solve this problem. Hence, this study aimed to compare the various surface treatments of multilithic teeth to denture base resin.

In this experimental laboratory study, 44 maxillary first molar were used,whichwere divided intofour groups(n=11): control, control + MMA, sandblast, and sandblast + MMA. After resin packing and polymerization, each of specimens was tested by universal testing machine with cross head speed of 1 mm/min. The study data were analyzed by one-way ANOVA and supplementary Post HocTukey
tests (P<0.05).

The mean bond strength in control + MMA (342.09±45.32 Newton) group was reported higher than the other groups, followed by sandblast + MMA (222.09±32.15 Newton), sandblast (177.36±24.78 Newton) and control (104.45±21.07 Newton) groups, between which a significant difference was observed (P<0.05). Adhesive failure was observed as the most common fracture mode, specifically in the control and sandblast groups.
Conclusion

The study findings revealed thatchemical treating of the ridge lap surface of multilithic teeth by methyl methacrylate monomer significantly improved bond strength to denture base resin compared to the mechanical surface treatment.