Peel strength of denture liner to PMMA and polyamide: laser versus air-abrasion

Abstract

PURPOSEThis study investigated the effect of laser parameters and air-abrasion on the peel strength of silicon-based soft denture liner to different denture resins.MATERIALS AND METHODSSpecimens (N=180) were prepared out of three different denture base resins (Rodex, cross-linked denture base acrylic resin; Paladent, heat-cured acrylic resin; Deflex, Polyamide resin) (75 mm × 25 mm × 3 mm). A silicon-based soft denture liner (Molloplast B) was applied to the denture resins after the following conditioning methods: a) Air-abrasion (50 µm), b) Er,Cr:YSGG laser (Waterlase MD Turbo, Biolase Technology) at 2 W-20 Hz, c) Er,Cr:YSGG laser at 2 W-30 Hz, d) Er,Cr:YSGG laser at 3 W-20 Hz, e) Er,Cr:YSGG laser at 3 W-30 Hz. Non-conditioned group acted as the control group. Peel test was performed in a universal testing machine. Failure modes were evaluated visually. Data were analyzed using two-way ANOVA and Tukey's test (α=.05).RESULTSDenture liner tested showed increased peel strength after laser treatment with different parameters (3.9±0.4 - 5.58±0.6 MPa) compared to the control (3.64±0.5 - 4.58±0.5 MPa) and air-abraded groups (3.1±0.6 - 4.46±0.3 MPa), but the results were not statistically significant except for Paladent, with the pretreatment of Er,Cr:YSGG laser at 3 W-20 Hz. Polyamide resin after air-abrasion showed significantly lower peel strength than those of other groups (3.1±0.6 MPa).CONCLUSIONHeat-cured acrylic resin, PMMA, may benefit from Er,Cr:YSGG laser treatment at 3 W-20 Hz irradiation. Air-abrasion of polyamide resins should be avoided not to impair their peel bond strengths to silicon-based soft denture liners.

Effect of Different Surface Treatments and Thermocycling on Bond Strength of a Silicone-based Denture Liner to a Denture Base Resin

“…Nevertheless, limited and inconsistent findings are available regarding the effectiveness of laser treatment in improving bond strength between soft lining materials and denture resin. 11,14,17,21 In the oral cavity, liner denture base resin interface is frequently subjected to thermal stresses. It has been found that the bonding between resilient liner materials and denture resin is affected by aging in water and thermocycling.…”

Bond Strength of Resilient Lining Materials to Denture Base Resin: A Systematic Review and Meta‐Analysis

“…Akin et al reported that sandblasting and laser increased bond strength of silicone‐based resilient lining material. Korkmaz et al applied peel test and Usumez et al applied tensile test, and reported that laser was more effective than sandblasting and control. The number of studies applying sandblasting was also high; however, it was ineffective in increasing the bond strength.…”

“…To provide a good bond strength between the denture base resin and the resilient lining material, several investigators have used sandblasting with alumina, laser application, chemical cauterization or primers, acrylic drills or mesh textured glass fibers . This study aims to analyze published information on the bond strength of resilient lining materials applied with different surface treatments to denture base resins and using various laboratory tests.…”

Bond Strength of Soft Lining Material to Polyamide Denture Material

“…There are not enough investigation about the bond strength of polyamide denture and soft lining materials. Korkmaz et al 40 have found that, air abrasion of polyamide resins should be avoided not to impair their peel bond strengths to silicon-based soft denture liners.…”