Comparative Evaluation of Compressive Bond Strength Between Denture Base and Two Types of Iranian Artificial and Vita Artificial Teeth

Background: One of the challenges of complete prosthetics is to achieve the ideal compressive bond strength (BS) between the denture base and artificial teeth and reduce the possibility of teeth separation. Due to the increase in the price of foreign artificial teeth, it is reasonable to utilize high-quality Iranian brands. Therefore, this study aimed to compare the BS between the denture base and two types of Iranian artificial teeth and Vita artificial teeth with a combination of chemical and mechanical surface treatments with orthophosphoric acid. Methods: In this study, 99 maxillary artificial posterior teeth from Vita, Stone, and Classic brands 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. They were mounted in heat-cured acrylic blocks, and then the compressive strength was evaluated by applying point pressure to each of the samples. The results were analyzed using an ANOVA statistical test with SPSS software. Results: The mean compressive strength of Vita teeth was 14.09, 16.09, and 17.90 in the control group, diamond bur treatment, and orthophosphoric acid treatment, respectively. This value was measured as 10.72, 13.18, and 12.54 in Stone teeth, as well as 13.27, 14.81, and 15.63, respectively, in Classic teeth. Diamond burr and orthophosphoric acid treatments significantly increased compressive strength in Vita (P<0.001), Stone (P=0.002), and Classic (P=0.008) teeth. Conclusion: Based on the findings, the surface treatments of diamond burr and orthophosphoric acid could noticeably increase 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.