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KMID : 1035320190460040243
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Korean Society for Dental Materials
2019 Volume.46 No. 4 p.243 ~ p.252
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Effect of silane and alkali treatment on the shear bond strength between two Ni-Cr alloys and acrylic resin
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Park Kwang-Sig
Kwon Tae-Yub
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Abstract
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Sufficient bonding between the framework of the cast alloy and the denture base resin is essential for the clinical successof removable partial dentures. In this study, we investigated whether the silane and alkali treatments improve the chemicalbonding between two nickel-chromium alloys and acrylic resin and thus the shear bond strength. A silane solution was preparedusing 3-methacryloxypropyltrimethoxysilane. The alloy specimens were treated with silane and alkali, preparing four experimentalgroups: untreated (UT), silane treated (ST), alkali treated (AT), and alkali/silane treated (AST) groups. In addition, the contactangles and surface roughness of the alloy surfaces of the four groups were measured. The acrylic resin was bonded to thealloy specimens, and then the resin was polymerized to form a bonded specimen. After measuring the shear bond strength,the failure modes were examined using scanning electron microscopy. Results for all groups were analyzed using two-wayANOVA followed by Tukey's multiple comparison test at a significance level of 0.05. The statistical analysis showed no significantdifferences in Ra value for all groups (p>.05). In the two alloys, the contact angle of the AT group was significantly lowerthan that of the other groups (p<.05), and that of the AST group was significantly higher than that of the ST group (p<.05).
In both alloys, the ST and AST groups showed the higher shear bond strengths (p<.05), while the UT and AT groups showedthe lower values. The UT and AT groups showed complete adhesive failure at the fractured surfaces. In this study, the silanetreatment was effective to improve the shear bond strength, but the alkali treatment did not show any significant effect.
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KEYWORD
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Alkali, Acrylic resin, Ni-Cr alloy, Shear bond strength, Silane
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