Effect of new laser type on shear bond strenght of acrylic teeth to denture base

Background: The aim of this study is to examine the Shear Bond Strength (SBS) to repairing acrylic or acrylic artificial teeth which applied to four different surface treatments. Materials and Methods: Fourty molar acrylic denture teeth were ground on the ridge lap area with a water sand paper to provide a uniform surface for bonding. Acrylic teeth embedded in cold cured acrylic resin and specimens were randomly seperated into four roups (n = 10), according to the urface treatments applied; 1-Control, 2-Air abrasion, 3-Er-YAG laser and 4-Femtosecond laser. The cold cured acrylic resin (Vertex self curing) was then mixed according to the manufacturer′s instructions and injected into the Teflon tubes with an internal diameter and height of 4 and 3 mm, respectively. The SBS of the acrylic denture teeth was evaluated using a universal testing machine. Acrylic denture teeth bonding areas were observed with a stereomicroscope to identify the mode of fracture. Results: The data were evaluated statistically Kruskal Wallis one-way analysis of variance (ANOVA) and Mann Whitney U-tests with bonferronni correction. There were no statistically significant difference of mean bond strengths for shear tests among control, Er-YAG and Femtosecond laser application groups. But the highest SBS values were found for air abrasion groups. Conclusion: A quick and simple air abrasion surface treatment technique could be an effective option for denture repair.