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KMID : 0362320110360040280
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Journal of Korean Academy of Operative Dentistry
2011 Volume.36 No. 4 p.280 ~ p.289
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Effect of adhesive hydrophobicity on microtensile bond strength of low-shrinkage silorane resin to dentin
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Cho So-Yeun
Kang Hyun-Young
Kim Kyoung-A
Yu Mi-Kyung
Lee Kwang-Won
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Abstract
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Objectives: The purpose of this study was to evaluate (microtensile bond strength) of current dentin bonding adhesives which have different hydrophobicity with low-shrinkage silorane resin.
Materials and Methods: Thirty-six human third molars were used. Middle dentin was exposed. The teeth were randomly assigned to nine experimental groups: Silorane self-etch adhesives (SS), SS + phosphoric acid etching (SS + pa), Adper easy bond (AE), AE + Silorane system bonding (AE + SSb), Clearfil SE bond (CSE), CSE + SSb, All-Bond 2 (AB2), AB2 + SSb, All-Bond 3 (AB3). After adhesive’s were applied, the clinical crowns were restored with Filtek LS (3M ESPE). The 0.8 mm 0.8 mm sticks were submitted to a tensile load using a Micro Tensile Tester (Bisco Inc.). Water sorption was measured to estimate hydrophobicity adhesives.
Results: of silorane resin to 5 adhesives: SS, 23.2 MPa; CSE, 19.4 MPa; AB3, 30.3 MPa; AB2 and AE, no bond. Additional layering of SSb: CSE + SSb, 26.2 MPa; AB2 + SSb, 33.9 MPa; AE + SSb, no bond. High value of was related to cohesive failure. SS showed the lowest water sorption. AE showed the highest solubility.
Conclusions: The hydrophobicity of adhesive increased, and silorane resin bond-strength was also increased. Additional hydrophobic adhesive layer did not increase the bond-strength to silorane resin except AB2 + SSb. All-Bond 3 showed similar & water sorption with SS. By these facts, we could reach a conclusion that All-Bond 3 is a competitive adhesive which can replace the Silorane adhesive system.
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KEYWORD
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Adhesive hydrophobicity, Dentin bonding system, Microtensile bond strength, Silorane resin, Water sorption test
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