Effects of swelling in polymethyl methacrylate frame of prostheses on adhesive properties of swollen polymethyl methacrylate frame and SYª²1 silicone elastomer

    QU Le, ZHAO Yiª²Min, YI Yuanª²Fu, WU Bing, WANG Chao, FANG Xiaoª²Mei

    1Department of Prosthetics, College of Stomatology, Fourth Military Medical University, Xi¡¯an 710033, China, 2Department of Stomatology, General Hospital of Armed Police Force, Beijing 100039, China, 3Northwest Elastomer General Factory, Xianyang 712000, China

    ¡¾Abstract¡¿ AIM: To evaluate the effects of swelling in polymethyl methacrylate frame of prostheses on adhesive properties of swollen polymethyl methacrylate frame and SYª²1 silicone elastomer. METHODS: The tension strength and peeling strength between polymethyl methacrylate and SYª²1 silicone elastomer were tested before and after swelling in polymethyl methacrylate frame. RESULTS: After the surfaces of the polymethyl methacrylate frame were swelled by liquid denture acrylic, their adhesive strength with SYª²1 silicone elastomer decreased obviously. The tension strength before swelling (0.98¡À0.04) was stronger than that after swelling (0.53¡À0.04) (P<0.01), and the peeling strength before swelling (0.70¡À0.03) was stronger than that after swelling (0.33¡À0.03) ( P<0.01). CONCLUSION: The adhesive strength between polymethyl methacrylate and SYª²1 silicone elastomer becomes weaker after the swelling of the surface of polymethyl methacrylate. ......