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

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Authors
Chang, Ju-Hea; Lee, In-Bog; Cho, Byeong-Hoon; Kim, Hae-Young; Son, Ho-Hyun
Issue Date
2008
Publisher
대한치과보존학회
Citation
33(1), 2008
Keywords
Adhesive layerhybrid layerhydrophilic monomermodulus of elasticitynanoindentationthermocycling
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.
ISSN
1225-0864
Language
English
URI
https://hdl.handle.net/10371/47468
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College of Dentistry/School of Dentistry (치과대학/치의학대학원)Dept. of Dentistry (치의학과)Journal Papers (저널논문_치의학과)
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