Mosharrafian Shahram, Afshar Hossein, Farbod Maryam, Baniameri Zahra
Assistant Professor, Department of Pediatric Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
Associate Professor, Department of Pediatric Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
J Dent (Tehran). 2016 Sep;13(5):349-356.
This in-vitro study aimed to compare the push-out bond strength of composite to prepared and unprepared intracanal dentin using a 5th generation bonding agent in primary anterior teeth after etching for seven and 15 seconds.
Sixty primary anterior teeth were randomly divided into four groups. In groups one and two, intracanal dentin remained intact while in groups three and four it was prepared using a #5 round bur and low-speed handpiece. Single Bond 2 was used in groups one and three after 15 seconds and in groups two and four after seven seconds of etching with phosphoric acid. After restoring with composite resin and incubation, the specimens were subjected to push-out bond strength test. Data were analyzed using two-way ANOVA and Kaplan Meier curves.
The mean bond strength was not significantly different between seven and 15 seconds etching times (P=0.198). Dentin preparation had no significant effect on the mean bond strength (P=0.838). The interaction effect of etching time and dentin preparation was not significant either (P=0.680).
Decreasing the etching time from 15 to seven seconds and preparation of intracanal dentin had no significant effect on push-out bond strength of composite to intracanal dentin of primary anterior teeth.
本体外研究旨在比较在乳牙前牙中使用第五代粘结剂，在酸蚀7秒和15秒后，复合树脂与预备和未预备的根管内牙本质之间的推出粘结强度。
60颗乳牙前牙随机分为四组。第一组和第二组中，根管内牙本质保持完整，而第三组和第四组使用5号圆钻和低速手机进行预备。第一组和第三组在磷酸酸蚀15秒后使用Single Bond 2粘结剂，第二组和第四组在酸蚀7秒后使用。用复合树脂修复并孵育后，对标本进行推出粘结强度测试。使用双向方差分析和Kaplan Meier曲线分析数据。
酸蚀时间为7秒和15秒时，平均粘结强度无显著差异（P=0.198）。牙本质预备对平均粘结强度无显著影响（P=0.838）。酸蚀时间和牙本质预备的交互作用也不显著（P=0.680）。
将酸蚀时间从15秒减少到7秒以及根管内牙本质的预备，对复合树脂与乳牙前牙根管内牙本质之间的推出粘结强度无显著影响。
