Comparison of elongation amount and bond strength between different soft lining materials and PMMA denture base material [Farkli yumusak astar malzemelerinin uzama miktarlarinin ve PMMA kaideye baglanma dayaniminin karsilastirilmasi]

Objectives: The bond strength and elongation amount of different soft lining materials were evaluated in the current study. Material and Methods: Following the flasking of wax specimens in dental stone, wax removal and processing of polymethylmetacrylate (Meliodent) denture material, 3 different soft relining materials (Molloplast-B, Mollosil Plus, Vertex Soft) were placed within the space prepared in the center of polymethylmetacrylate (PMMA) specimens (n=8). Using a crosshead speed of 5mm/min, tensile test was continued until failure was occurred. Mean tensile strength (MPa) and mean elongation (mm) was measured. Data was analyzed using one-way ANOVA and Tukey multiple comparison test (?=0.05). Results: Significant differences were found among the tensile bond strength results (p<0.05). The highest bond strength value was observed for acrylic base soft lining material (1.6 (0.2) MPa), while the lowest value was observed for autopolymerized silicon based material (0.9 (0.1) MPa). A significant difference was not found between the heat polymerized acrylic and the silicon based soft lining materials. All three materials showed similar values in terms of elongation amounts (p<0.05). The elongation amounts were 6 (2.1) mm for acrylic based soft lining material, 7.1 (1.8) mm for autopolymerized silicon soft lining material and 4.8 (2.3) mm for heat polymerized silicon material. Conclusions: No significant difference was found between the heat polymerized acrylic and the silicone based soft lining materials. Autopolymerizing silicone based soft lining material has the lowest bond strength value. No significant difference was found for elongation amounts