AUTHOR(S): Dr. Al-Shakaki Hala and Dr. Al-Essa Hussein

ABSTRACT:Failure of the bond between the acrylic resin and resilient liner material is commonly encountered in clinical practice. The purpose of this study was to investigate the effect of different surface treatments (monomer MMA, Er: YAG laser) on tensile bond strength of silicone-based soft denture liner. Polymethyl methacrylate test specimens were fabricated and each received one of three surface treatments: untreated (control), MMA monomer treatment, Er:YAG laser irradiated with three different intensity. The resilient liner specimens (n=50) were processed between two polymethyl methacrylate (PMMA) blocks. Bonding strength of the liners to PMMA were compared by tensile test with the use of a universal testing machine at a crosshead speed of 5 mm/min. T-student test was used to analyze the data (α=0.05). Altering the polymethyl methacrylate surface by Er:YAG laser (300mJ) significantly increased the bond strengths in polymethyl methacrylate/silicone specimens.

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