Evaluation of bond Strength of soft liner on pmma after physical and chemical Surface Treatments: An In-Vitro Study

Aim: To evaluate and compare the effectiveness of physical and chemical agents on tensile bond strength of soft liner to the PMMA. Purpose: The purpose of this in vitro study was to evaluate the effect of Diode laser and Ethyl acetate treatments on the bond strengths of acrylic resin to silicon liners. Materials and methods: Heat-polymerized acrylic resin (Acralyn-H) was bonded to silicone softliner material (GC Reline II Soft) to create control specimens (n=22), Diode laser treatment (n=22), and Ethyl acetate treatment (n=22). Silicone liner was polymerized on resin specimens. The tensile bond strength test was performed at a crosshead speed of 1 mm/min with a 10-N load until failure. Data were analyzed by using the anova and posthoctukey test. Results: The laser group showed significantly higher bond strength than the Ethyl acetate group (p<0.05). The Maximum tensile bond strength values were determined in the laser-treated group (1.23 MPa) while the lowest bond strength values were determined in the control group (0.323 MPa). Conclusions: Diode laser and Ethyl acetate applications increases the tensile bond strength between soft-liner material and resin. Diode laser treatment results in higher bond strength values than treatment with Ethyl acetate for 1 minute.