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http://dx.doi.org/10.5395/JKACD.2011.36.4.280

Effect of adhesive hydrophobicity on microtensile bond strength of low-shrinkage silorane resin to dentin  

Cho, So-Yeun (Department of Conservative Dentistry, Jeonbuk National University School of Dentistry)
Kang, Hyun-Young (Department of Conservative Dentistry, Jeonbuk National University School of Dentistry)
Kim, Kyoung-A (Department of Conservative Dentistry, Jeonbuk National University School of Dentistry)
Yu, Mi-Kyung (Department of Conservative Dentistry, Jeonbuk National University School of Dentistry)
Lee, Kwang-Won (Department of Conservative Dentistry, Jeonbuk National University School of Dentistry)
Publication Information
Restorative Dentistry and Endodontics / v.36, no.4, 2011 , pp. 280-289 More about this Journal
Abstract
Objectives: The purpose of this study was to evaluate ${\mu}TBS$ (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 ${\times}$ 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: ${\mu}TBS$ 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 ${\mu}TBS$ 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 ${\mu}TBS$ & 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.
Keywords
Adhesive hydrophobicity; Dentin bonding system; Microtensile bond strength; Silorane resin; Water sorption test;
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