Effect of different surface treatments and thermocycling on bond strength of a silicone-based denture liner to a denture base resin

Nakhaei, M. and Dashti, H. and Ahrari, F. and Vasigh, S. and Mushtaq, S. and Shetty, R. M. (2016) Effect of different surface treatments and thermocycling on bond strength of a silicone-based denture liner to a denture base resin. Journal of Contemporary Dental Practice, 17 (2). pp. 154-159.

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Aim: The aim of this study is to evaluate the effects of three different surface treatments and thermocycling on the tensile strength of a silicone lining material to denture resin. Materials and methods: A total of 96 cube-shaped specimens were fabricated using heat-cured polymethyl methacrylate (PMMA) denture base resin. Three millimeters of the material was cut from the midsection. The specimens were divided into four groups. The bonding surfaces of the specimens in each group received one of the following surface treatments: no surface treatment (control group), airborne particle abrasion with 110 μm alumina particles (air abrasion group), Er:yttrium aluminum garnet laser irradiation (laser group), and air abrasion + laser. After the lining materials were processed between the two PMMA blocks, each group was divided into two subgroups (n = 12), either stored in distilled water at 37°C for 24 hours or thermocycled between 5 and 55°C for 5,000 cycles. The specimens were tested in tensile and shear strength in a universal testing machine. Data were analyzed with two-way analysis of variance and Tamhane's post hoc tests (α = 0.05). The mode of failure was determined, and one specimen in each group was examined by scanning electron microscopy. Results: Surface-treated groups demonstrated significantly higher tensile strengths compared to the control group (p < 0.001). Nonetheless, no significant differences were found between surface-treated groups (p > 0.05). The tensile strength was significantly different between thermocycled and waterstored specimens (p = 0.021). Conclusion: Altering the surface of the acrylic denture base resin with air abrasion, laser, and air abrasion + laser increased the tensile strength. Thermocycling resulted in decrease in bond strength of silicone-based liner to surface-treated acrylic resin.

Item Type: Article
Additional Information: Cited By :2 Export Date: 16 February 2020 Correspondence Address: Nakhaei, M.; Faculty of Dentistry and Dental Research Center, Vakilabad Blvd, PO Box: 91735-984, Iran; email: Nakhaeemr@mums.ac.ir
Uncontrolled Keywords: Bond strength Er:YAG laser Resilient denture liner Thermocycling dental material poly(methyl methacrylate) silicone derivative adhesion chemistry comparative study dental bonding dental procedure denture liner human materials testing scanning electron microscopy surface property temperature tensile strength Adhesiveness Dental Materials Dental Stress Analysis Denture Liners Humans Microscopy, Electron, Scanning Polymethyl Methacrylate Silicones Surface Properties
Subjects: W General medicine- Health professions
Divisions: Mashhad University of Medical Sciences
Depositing User: mr lib4 lib4
Date Deposited: 01 Mar 2020 07:21
Last Modified: 01 Mar 2020 07:21
URI: http://eprints.mums.ac.ir/id/eprint/13123

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