Long-term bonding durability of four dentin adhesive systems

概要

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We attempted to estimate the in vitro bonding durability of four adhesive systems to dentin. The tensile bond strength (TBS) was determined for specimens immersed for 1 day, 1 month, 3 months, 6 months, 1 year and 2 years. The two etching systems used were Scotchbond MP and Single Bond, and the two self-etching primer systems were Fluorobond and Linerbond IIΣ. The bovine dentin surfaces were polished with SiC paper up to 600 grit before application. TBS was significantly reduced with the Scotchbond MP system at 1 year, and degradation of the dentin surface was seen after 6 months. TBS was stable and adhesive failures were observed with the Single Bond system during all test periods. TBS was significantly decreased with the Fluorobond system, and the hybridized smear layer was observed at 1 year. With the Linerbond IIΣ system, the TBS was stable during all test periods and there were fractured surfaces that included mixed failure of the adhesive, and cohesive failure in sound dentin. We concluded that the demineralized dentin and hybridized smear layer compromised the bond strength of the composite resin to dentin, and that the remaining demineralized dentin was less durable than the hybridized smear layer in the subsurface of the dentin surface created with the SiC 600 grit sandpaper.
大阪歯科学会の論文