Hiraishi N, Yiu C K Y, King N M, Tay F R
Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, Pokfulam, Hong Kong SAR, China.
Dent Mater. 2009 Jan;25(1):58-66. doi: 10.1016/j.dental.2008.05.005. Epub 2008 Jun 24.
The objectives of this study were to examine the effect of pulpal pressure on the microtensile bond strength (mTBS) of luting resin cements to human dentin and the permeability of dentin surfaces pre-treated with an adhesive and a self-etching primer.
Cylindrical composite blocks were luted with resin cements (RelyX ARC, 3M ESPE: ARC; Panavia F, Kuraray Medical Inc.: PF; RelyX Unicem, 3M ESPE: UN) in the absence or presence of simulated pulpal pressure. The application of Adper Single Bond 2 (3M ESPE) and ED primer 2.0 (Kuraray) was performed under 0 cm H(2)O. After each resin cement was applied, the pulpal pressure group was subjected to 20 cm H(2)O of hydrostatic pressure for 10 min during the initial setting period. Testing for mTBS was performed on 0.9 mm x 0.9 mm sectioned beams after 24h water-storage. Scanning electron microscopy was performed to investigate the fractured surfaces after mTBS testing and additional dentin surfaces that were treated by an etchant, ED primer 2.0 and UN. Fluid permeability was measured on dentin surfaces that were applied with Adper Single Bond 2 and ED primer 2.0.
Application of pulpal pressure reduced mTBS significantly in groups ARC and PF. Porous bonding interfaces due to water permeability through the cured adhesive were observed on fractured surfaces. Dentin surfaces that were applied with the adhesive and the primer were more permeable than smear layer-covered dentin. The mTBS of UN was significantly lower than ARC and PF regardless of the absence/presence of pulpal pressure.
Fluid permeation during the initial setting period deteriorated the bonding quality of resin cements.
本研究的目的是检测牙髓压力对粘结树脂水门汀与人类牙本质的微拉伸粘结强度（mTBS）的影响，以及对经粘结剂和自酸蚀底漆预处理的牙本质表面渗透性的影响。
在有无模拟牙髓压力的情况下，用树脂水门汀（RelyX ARC，3M ESPE公司：ARC；Panavia F，可乐丽医疗株式会社：PF；RelyX Unicem，3M ESPE公司：UN）粘结圆柱形复合树脂块。在0 cm H₂O条件下应用Adper Single Bond 2（3M ESPE公司）和ED底漆2.0（可乐丽公司）。每种树脂水门汀应用后，在初始凝固期，牙髓压力组接受20 cm H₂O的静水压力10分钟。储水24小时后，在0.9 mm×0.9 mm的切片梁上进行mTBS测试。进行扫描电子显微镜检查，以研究mTBS测试后的断裂表面以及经酸蚀剂、ED底漆2.0和UN处理的额外牙本质表面。在应用了Adper Single Bond 2和ED底漆2.0的牙本质表面测量流体渗透性。
在ARC组和PF组中，牙髓压力的施加显著降低了mTBS。在断裂表面观察到由于固化粘结剂的水渗透性导致的多孔粘结界面。应用了粘结剂和底漆的牙本质表面比涂抹层覆盖的牙本质更具渗透性。无论有无牙髓压力，UN的mTBS均显著低于ARC和PF。
初始凝固期的流体渗透使树脂水门汀的粘结质量恶化。
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