Rahimi Mehdi, Jainaen Angsana, Parashos Peter, Messer Harold H
School of Dental Science, The University of Melbourne, Melbourne, Victoria, Australia.
J Endod. 2009 Jan;35(1):121-4. doi: 10.1016/j.joen.2008.10.009.
This study compared the microshear bond strength of three resin-based sealers to root dentin and assessed whether sealer cements behave differently in thin and thick films. Extracted maxillary premolars were sectioned buccolingually, and 45 root halves were randomly allocated for microshear bond testing with the three resin sealers in thin and thick films. The microshear bond strength was then calculated in MPa. Failure modes were examined under light and scanning electron microscopy. Data were analyzed by using analysis of variance, with significance set at p < 0.05. Overall, the epoxy resin-based sealers had the highest microshear bond strength to root dentin compared with urethane dimethacrylate-based sealers (p < 0.001). Bond strengths for the thick sealer group were significantly higher than the thin sealer group (p < 0.001) and may reflect different patterns of behavior when the sealer is present as a thin layer.
本研究比较了三种树脂类封闭剂与牙根牙本质的微剪切粘结强度，并评估了封闭剂粘结剂在薄膜和厚膜中的行为是否不同。将拔除的上颌前磨牙颊舌向切片，45个牙根半片被随机分配用于对三种树脂封闭剂在薄膜和厚膜状态下进行微剪切粘结测试。然后以兆帕为单位计算微剪切粘结强度。在光学显微镜和扫描电子显微镜下检查失败模式。采用方差分析对数据进行分析，显著性设定为p < 0.05。总体而言，与基于聚氨酯二甲基丙烯酸酯的封闭剂相比，基于环氧树脂的封闭剂对牙根牙本质具有最高的微剪切粘结强度（p < 0.001）。厚封闭剂组的粘结强度显著高于薄封闭剂组（p < 0.001），这可能反映了封闭剂呈薄层状时不同的行为模式。
