Cantekin K
Department of Pediatric Dentistry, Faculty of Dentistry, Erciyes University, Kayseri, Turkey.
J Clin Pediatr Dent. 2015 Winter;39(2):143-8. doi: 10.17796/jcpd.39.2.84x57tp110k46183.
The aim of the present study was to evaluate the bond strength of methacrylate-based (MB) composites, silorane-based (SB) composites, and glass-ionomer cement (GIC) in comparison to TheraCal and to compare those findings with the reference pulp capping material (MTA).
A total of 90 acrylic blocks were prepared. Each of the blocks were prepared as 15 mm high and 10 mm diameter and the blocks had a 2 mm high and a 5 mm diameter central hole. In 45 of the samples, the holes were fully filled with TheraCal and in the other 45 samples, the holes were fully filled with MTA. The TheraCal and the MTA samples were randomly divided into 3 subgroups of 15 specimens each: Group-1: Methacrylate-based (MB) composite; Group-2: Silorane-based (SB) composite; and Group-3: Glass-ionomer cement (GIC). For the shear bond strength (SBS) test, each block was secured in a universal testing machine. After the SBS test, the fractured surfaces were examined under a stereomicroscope at ×25 magnification.
The analysis of variance that compared the experimental groups revealed the presence of significant differences among the groups (P < 0.001). The highest (19.3 MPa) and the lowest (3.4 MPa) bond strength value were recorded for the MB composite-TheraCal and the GIC-TheraCal, respectively.There were significant differences in bond strength between the TheraCal and the MTA groups for the MB composite subgroup (P < 0.001) and the SB composite subgroup (P < 0.05); however, there was no significant difference in bond strength for the GIC subgroup (P ≯ 0.05). Conlusions: The results from this in vitro study suggest that the new pulp capping material, known as light-curable MTA, showed clinically acceptable and higher shear bond scores compared to MTA when used with the MB composite.
本研究的目的是评估甲基丙烯酸酯基（MB）复合材料、硅氧烷基（SB）复合材料和玻璃离子水门汀（GIC）与TheraCal相比的粘结强度，并将这些结果与参考牙髓盖髓材料（MTA）进行比较。
共制备90个丙烯酸块。每个块制备成高15mm、直径10mm，且块体有一个高2mm、直径5mm的中心孔。在45个样本中，孔中完全填充TheraCal，在另外45个样本中，孔中完全填充MTA。将TheraCal和MTA样本随机分为3个亚组，每组15个样本：第1组：甲基丙烯酸酯基（MB）复合材料；第2组：硅氧烷基（SB）复合材料；第3组：玻璃离子水门汀（GIC）。对于剪切粘结强度（SBS）测试，每个块固定在万能试验机中。SBS测试后，在体视显微镜下以25倍放大率检查断裂表面。
比较实验组的方差分析显示组间存在显著差异（P < 0.001）。MB复合材料-TheraCal和GIC-TheraCal的粘结强度值分别记录为最高（19.3MPa）和最低（3.4MPa）。MB复合材料亚组（P < 0.001）和SB复合材料亚组（P < 0.05）中，TheraCal组和MTA组之间的粘结强度存在显著差异；然而，GIC亚组的粘结强度没有显著差异（P≯0.05）。结论：这项体外研究的结果表明，与MTA相比，新型牙髓盖髓材料光固化MTA与MB复合材料一起使用时，显示出临床可接受的更高剪切粘结评分。
