The change of adaptability change in adhesive systems to dentin substrte according to storage time / 대한치과보존학회지

ABSTRACT

This study compared the microtensile bond strength (microTBS) and microscopic change of two 2-step and two 1-step self-etching adhesives to dentin according to storage times in distilled water. Occlusal dentin was exposed in 48 human molars. They were divided to four groups by different adhesives SE Bond group (Clearfil SE Bond), AdheSE group (AdheSE), Adper group (Adper Prompt L-Pop), and Xeno group (Xeno III). Each group was stored in 37degrees C distilled water for 1, 15, and 30 days. Resin-bonded specimens were sectioned into beams and subjected to microTBS testing with a crosshead speed of 1 mm/minute. For SEM observation, one specimen was selected and sectioned in each group after each stroage time. Resin-dentin interface was observed under FE-SEM. In all storage times, mean microTBS of SE group was significantly higher than those of other groups (p < 0.05). There was no significant difference between mean microTBS of SE group and AdheSE group among all storage times, but significant difference between 1- and 30-day storage in mean microTBS of Adper group and Xeno group (p < 0.05). For 1-and 15-day storage, all groups showed the close adaptation between resindentin interfaces. For 30-day storage, resin-dentin interfaces showed wide gap in Adper group and separate pattern in Xeno III group.