Bond strength between acrylic resin and artificial tooth treated with experimental silane with thio-urethane

This in vitro study evaluated the bond strength between thermo-activated acrylic resin and artificial tooth treated with experimental silane incorporated with thio-urethane. Artificial molar teeth were individually fixed in 50mm long cylindrical wax sticks and traditionally included in metal flasks with type III plaster coated with laboratory silicone. The tooth/wax sets were removed from the flask, the tooth separated from the wax stick, and the fitting area was cleaned with household detergent. Teeth were separated into three groups according to fitting area treatments (n=10): CON (Control, no treatment or silane application), ABR (Abrasion with diamond tip), and JAT (Blasting with 50μm aluminum oxide particles). Tooth fitting area treatment was associated with PALABOND commercial silane application (PS) or experimental silane incorporated with thio-urethane (ES). Teeth were replaced in the plaster mold, and the acrylic resin traditionally flask pressed and polymerized in a heated water bath. Tooth/resin sets were individually fixed in rigid PVC tubes with chemically activated acrylic resin, leaving a space of 1 mm between the tooth/PVC tube top, and submitted to the shear strength test in a universal test machine. Shear strength data were evaluated for normality, and subjected to one-way ANOVA and Tukey's test (5%). JAT+PS showed greater strength followed by ABR+ES. CON and JAT+ES showed lowest values and ABR+PS was intermediate. In conclusion, the artificial teeth treatments with experimental silane incorporated with thio-urethane associated with blasting or abrasion promoted different strength values when bonded to acrylic resin for denture base.