Year : 2018

Volume : Volume 9

Issue : Issue 2s

Address for correspondence :
Dr. Sareen Duseja.
drsareenduseja@gmail.com

Abstract

Background:  Chronic soreness beneath dentures has been the cause of major concern for completely edentulous patients with atrophied submucosa. Soft liners are now being used to overcome this issue. So, a study was conducted to evaluate and compare four soft lining materials where they were subjected to thermal and mechanical stresses over a period of 3 months and their stress relaxation property was checked.  Materials and method: 20 specimens each (total 80 specimens) for four commercially available soft liners were prepared. Acrylic and silicone based lining materials in both Autopolymerizing and heat cured form were used for preparing specimens. Thermocycling and cyclic loading for a period of three months for these specimens was done and their stress relaxation property was evaluated at baseline, 1 month and 3 months. Statistical analysis was done by paired t-test and two way ANOVA test. Results: The autopolymerizing silicone was found to have maximum stress relaxation property at baseline. The values for heat cure silicones were found to be maximum after 3 months. However, the stress relaxation property was found to be significantly (p<0.001) reduced irrespective of the nature of material. Conclusion: Heat cure silicone liners were found to be superior in terms of stress bearing capacity as compared to autopolymerizing silicones and acrylic based soft liners.

Keywords: Stress Relaxation, Soft Liners, Thermocycling, Cyclic Loading.