Estaki Zohreh, Afshar Hossein, Ghadimi Sara, Derakhshan Samira
Postgraduate Student, Department of Pediatric Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
Professor, Department of Pediatric Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
J Dent (Tehran). 2018 Sep;15(5):300-308.
This in-vitro study aimed to compare the push-out bond strength of composite resin posts packed into the root canal of primary anterior teeth using two different layering techniques.
Thirty-two primary anterior teeth were randomly divided into two groups. In group 1, after the preparation of post spaces, a posterior composite resin (Filtek P60) was packed in three horizontal layers by a composite condenser instrument with a cylindrical tip using the horizontal layering technique (HLT). In group 2, this was done using a condenser with a conical tip in three funnel-shaped layers according to the funnel-shaped layering technique (FSLT). Next, the specimens were subjected to push-out bond strength testing. Data were analyzed using t-test and the Kaplan-Meier curves.
The mean±standard deviation (SD) bond strengths of composite resin posts were 8.46±3.45 MPa and 7.7±2.24 MPa for the HLT and FSLT, respectively; the difference was not statistically significant (P=0.46).
The layering technique by which composite resin was packed into the root canal of primary anterior teeth (HLT versus FSLT) had no significant effect on the push-out bond strength of composite resin posts.
本体外研究旨在比较使用两种不同分层技术将复合树脂桩核充填到乳前牙根管内后的推出粘结强度。
32颗乳前牙随机分为两组。第1组，在制备桩核空间后，使用带有圆柱形尖端的复合树脂充填器，采用水平分层技术（HLT）将后牙复合树脂（Filtek P60）分三层水平充填。第2组，根据漏斗形分层技术（FSLT），使用带有圆锥形尖端的充填器分三层呈漏斗形充填。接下来，对标本进行推出粘结强度测试。数据采用t检验和Kaplan-Meier曲线进行分析。
HLT组和FSLT组复合树脂桩核的平均±标准差粘结强度分别为8.46±3.45MPa和7.7±2.24MPa；差异无统计学意义（P=0.46）。
将复合树脂充填到乳前牙根管内的分层技术（HLT与FSLT）对复合树脂桩核的推出粘结强度无显著影响。
