Comparative evaluation of tensile bond strength of auto polymerising and heat cure soft liner with different denture base resins after surface treatment: An in vitro study

Aim: To compare the bond strength of the auto polymerising and heat cure soft liner bonded to the Different heat cure acrylic denture base resins

Materials and methods: One silicone based autopolymerising soft liner (Mollosil) and one silicon based heat polymerized soft liners (Molloplast-B ) were used in this study one twenty specimens (30mm x 10mm x10mm) were fabricated in stainless steel molds for testing Tensile strength. 240 blocks randomly divided into 12 groups, each group contained 20 blocks to fabricated 10 specimens per group. The specimen preparation and test for Tensile strength were carried out in accordance with the ISO Specification No. 10139 for soft denture liners.

Result: The Mean Tensile bond strength was found to be highest (3.20 Mpa) for Group12 - PMMA (Trevelon) after Surface treatment with MMA and alumina particles packed with Molloplast – B Mollosil - Mean Tensile bond strength of Group 1,2,3(control group) was found to be less than Group 7,8,9( after surface treatment). Mollopast B - Mean Tear bond strength of Group 4,5,6 (control group) was found to be less than Group 10,11,12 (after surface treatment) The lowest Tensile bond strength was found to be of Group 2 - non treated PMMA Ashwin ( 1.22 Mpa)

Conclusion: Bond strength of Molloplast-B was greater than bond strength of Mollosil.

Bond strength of Molloplast-B packed against denture base trevalon after surface treatment was even greater than the bond strength of Molloplast-B bonded with trevalon without surface treatment. The lowest tensile bond strength was seen with Mollosil cured against denture base Ashwin.