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http://dx.doi.org/10.5395/JKACD.2008.33.1.045

Comparison of the elastic modulus among three dentin adhesives before and after thermocycling  

Chang, Ju-Hea (Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University)
Lee, In-Bog (Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University)
Cho, Byeong-Hoon (Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University)
Kim, Hae-Young (Craniomaxillofacial Life Science 21 and Dental Research Institute, School of Dentistry, Seoul National University)
Son, Ho-Hyun (Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University)
Publication Information
Restorative Dentistry and Endodontics / v.33, no.1, 2008 , pp. 45-53 More about this Journal
Abstract
The purpose of this study was to determine the effects on the elastic moduli of the adhesive and the hybrid layer from thermocycling. Twenty one human molars were used to create flat dentin surfaces. Each specimen was bonded with a light-cured composite using one of three commercial adhesives (OptiBond FL [OP], Clearfil SE Bond [CL], and Xeno III [XE]). These were sectioned into two halves and subsequently cut to yield 2-mm thickness specimens; one specimen for immediate bonding test without thermocycling and the other subjected to 10,000 times of thermocycling. Nanoindentation test was performed to measure the modulus of elasticity of the adhesive and the hybrid layer, respectively, using an atomic force microscope. After thermocycling, XE showed a significant decrease of the modulus in the adhesive layer (p < 0.05). Adhesives containing hydrophilic monomers are prone to hydrolytic degradation. It may result in the reduced modulus of elasticity, which leads to the mechanically weakened bonding interface.
Keywords
Adhesive layer; hybrid layer; hydrophilic monomer; modulus of elasticity; nanoindentation; thermocycling;
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