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ORIGINAL RESEARCH Table of Contents   
Year : 2015  |  Volume : 26  |  Issue : 5  |  Page : 514-519
Comparative evaluation of tensile bond strength of silicone-based denture liners after thermocycling and surface treatment


1 Department of Prosthodontics, Maulana Azad Institute of Dental Sciences, New Delhi, India
2 Punjab Government Dental College and Hospital, Amritsar, Punjab, India

Correspondence Address:
Harsimran Kaur
Department of Prosthodontics, Maulana Azad Institute of Dental Sciences, New Delhi
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0970-9290.172076

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Purpose: To examine, evaluate, and compare the tensile bond strength of two silicone-based liners; one autopolymerizing and one heat cured, when treated with different chemical etchants to improve their adhesion with denture base resin. Materials and Methods: Hundred and sixty test specimens of heat-cured polymethyl methacrylate (PMMA) were fabricated; out of which 80 specimens were tested for tensile bond strength after bonding it to autopolymerizing resilient liner (Ufigel P) and rest 80 to heat-cured resilient liner (Molloplast B). Each main group was further divided into four subgroups of 20 specimens each, one to act as a control and three were subjected to surface treatment with different chemical etchants namely dichloromethane, MMA monomer, and chloroform. The two silicone-based denture liners were processed between 2 PMMA specimens (10 mm × 10 mm × 40 mm) in the space provided by a spacer of 3 mm, thermocycled (5-55°C) for 500 cycles, and then their tensile strength measurements were done in the universal testing machine. Results: One-way ANOVA technique showed a highly significant difference in the mean tensile bond strength values for all the groups. The Student's t-test computed values of statistics for the compared groups were greater than the critical values both at 5% and at 1% levels. Conclusion: Surface treatment of denture base resin with chemical etchants prior to the application of silicone-based liner (Ufigel P and Molloplast-B) increased the tensile bond strength. The increase was the highest with specimens subjected to 180 s of MMA surface treatment and the lowest with control group specimens.


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