Evaluation of hardness of Silicone and Acrylic Resin Based Resilient Denture Liners Over A Period of Storage in Water

Dr. Monica Kotwal; Dr. Aditi Sharma; Dr. Randhir singh

Volume : VII, Issue : II, February - 2018

Evaluation of hardness of Silicone and Acrylic Resin Based Resilient Denture Liners Over A Period of Storage in Water

Dr. Monica Kotwal, Dr. Aditi Sharma, Dr. Randhir Singh

Abstract :

Background: Two potential problems commonly identified with a denture base incorporating a resilient liner are a failure of the bond between the acrylic resin and resilient liner material and a loss of resiliency of the resilient liner material over time. Methods: The current study was performed to assess the hardness of acrylic resilient liner in both auto–polymerized and heat–polymerized forms and silicone resilient liner in auto–polymerized form to a processed denture base resin over a period of water storage for 1 day, 1 week and 1 month. The denture liners investigated were acrylic resin–based heat–polymerized (Super–soft), acrylic resin–based autopolymerized (Coe–Soft) and silicone based autopolymerized (GC–reline) resilient liner. The resilient liners were processed according to manufacturer�s instructions. Tensile bond strength was measured in ASI Instron universal testing machine at a crosshead speed of 20 mm/min, and hardness was measured using a Shore–A durometer. Results: Two–way ANOVA and Tukey HSD tests were used to analyze the data (α=0.05). The results indicated that there were significant differences both in the hardness and bond strength values of resilient liner materials. Conclusion: Autopolymerized silicone resilient liner has increased hardness values than autopolymerized acrylic liner but the hardness values of autopolymerized silicone liner was less than heat cure acrylic resilient liner.