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  • Original Article
    Comparison of the elastic modulus among three dentin adhesives before and after thermocycling
    Juhea Chang, In Bog Lee, Byeong Hoon Cho, Hae-Young Kim, Ho Hyun Son
    J Korean Acad Conserv Dent 2008;33(1):45-53.   Published online January 31, 2008
    DOI: https://doi.org/10.5395/JKACD.2008.33.1.045
    AbstractAbstract PDFPubReaderePub

    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.

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