Abstract
Objectives: One of the challenges of complete prosthetics is to achieve the ideal compressive bond strength between the denture base and artificial teeth and reduce the possibility of the teeth separation. Due to the increase in the price of foreign artificial teeth, it is reasonable to utilize high-quality Iranian brands. Therefore, in this study, we compared the bond strength between denture base and two types of Iranian artificial teeth and Vita artificial teeth with a combination of mechanical and chemical surface treatments with orthophosphoric acid. Materials and Methods: In this study, 99 maxillary artificial posterior teeth from three brands, Vita, Stone and Classic, were evaluated in 9 groups. Mechanical surface treatment using diamond burs and chemical treatment with orthophosphoric acid were used at the junction of the tooth and the denture base, and they were mounted in heat-cured acrylic blocks, and then the compressive strength was evaluated by applying point pressure in each of the samples. The results were analyzed using ANOVA statistical test with SPSS software. Results: The mean compressive strength of Vita teeth was 14.09, 16.09 and 17.90 respectively in the control group, diamond bur treatment and orthophosphoric acid treatment. This value was measured as 10.72, 13.18 and 12.54 in Stone teeth and 13.27, 14.81 and 15.63 respectively in Classic teeth. Diamond burr treatments and orthophosphoric acid treatments have significantly increased compressive strength in Vita (P<0.001) and Stone (P=0.002) and Classic (P=0.008) teeth. Conclusion: The surface treatments of diamond burr and orthophosphoric acid significantly increased the compressive strength of Classic, Vita and Stone teeth. However, the physical treatment of diamond burr was more effective in Stone teeth. Orthophosphoric acid treatment significantly increased compressive strength in Vita and Classic teeth.