Asghari Mollabashi Shabnam, Nourmohamadi Shima, Nakhostin Afrooz
Students Research Committee, Arak University of Medical Sciences, Arak, Iran.
Department of Pediatric Dentistry, School of Dentistry, Arak University of Medical Sciences, Arak, Iran.
J Dent Res Dent Clin Dent Prospects. 2024 Spring;18(2):95-101. doi: 10.34172/joddd.39232. Epub 2024 Jun 24.
Severe caries in early childhood is a concern for both children receiving dental treatment and their parents. This dental disease progresses rapidly and quickly damages the coronal part of the tooth. When there is insufficient coronal structure to support a coronal restoration, using intracanal components following root canal treatment increases tooth resistance and helps provide retention for the coronal restoration. This study compared the shear bond strength of three types of intracanal posts (composite resin post, reverse metal post, and fiber post) in severely damaged primary anterior teeth.
This in vitro study was conducted on 30 extracted anterior primary teeth with at least two-thirds of healthy roots and no prior pulp treatment. The teeth were randomly divided into three groups of 10: group 1: composite resin post with 8th generation universal bonding, group 2: reverse metal post with GC restorative glass cement, and group 3: fiber post with GC restorative glass cement. After placing the post, the samples were restored with a height of 3 mm from cementoenamel junction (CEJ) using an Anterior GC Gradia Packable composite resin. All the samples underwent 500 cycles of thermocycling in a hot water bath at 55±2 °C and a cold water bath at 5±2 °C. The shear strength of the samples was then evaluated using an electromechanical universal testing machine at a rate of 1 mm/min and at a location 2 mm coronal to the CEJ in terms of megapascals.
The average shear bond strength of composite resin posts with 8th generation bonding application was 8.02220 MPa, reverse metal posts with glass ionomer application was 13.8600 MPa, and fiber posts with glass ionomer application was 9.7400 MPa.
Based on these findings, it can be concluded that the highest shear bond strength in this study was related to the reverse metal post, and the lowest shear bond strength was related to the composite resin post. According to the results, reverse metal posts demonstrated better shear bond strength than composite resin posts and fiber posts (<0.05).
幼儿严重龋齿是接受牙科治疗的儿童及其家长所关注的问题。这种牙科疾病进展迅速，会迅速破坏牙齿的冠部。当冠部结构不足以支持冠修复时，根管治疗后使用根管内组件可增加牙齿抗力，并有助于为冠修复提供固位。本研究比较了三种类型的根管内桩（复合树脂桩、倒金属桩和纤维桩）在严重受损的乳前牙中的剪切粘结强度。
本体外研究对30颗拔除的前乳牙进行，牙根至少三分之二健康且未进行过牙髓治疗。牙齿随机分为三组，每组10颗：第1组：使用第8代通用粘结剂的复合树脂桩；第2组：使用GC修复性玻璃粘固粉的倒金属桩；第3组：使用GC修复性玻璃粘固粉的纤维桩。放置桩后，使用前牙GC Gradia可压实复合树脂从牙骨质釉质界（CEJ）起修复3mm高度。所有样本在55±2°C的热水浴和5±2°C的冷水浴中进行500次热循环。然后使用机电万能试验机以1mm/min的速率在CEJ冠方2mm处评估样本的剪切强度，单位为兆帕。
使用第8代粘结剂的复合树脂桩的平均剪切粘结强度为8.02220MPa，使用玻璃离子水门汀的倒金属桩为13.8600MPa，使用玻璃离子水门汀的纤维桩为9.7400MPa。
基于这些发现，可以得出结论，本研究中最高的剪切粘结强度与倒金属桩相关，最低的剪切粘结强度与复合树脂桩相关 根据结果，倒金属桩的剪切粘结强度优于复合树脂桩和纤维桩（<0.05）。
