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首页> 外文期刊>Brazilian Journal of Oral Sciences >Fracture resistance of over-flared root canals filled with MTA and resin-based material: an in vitro study
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Fracture resistance of over-flared root canals filled with MTA and resin-based material: an in vitro study

机译：填充有MTA和树脂基材料的过度张开的根管的抗断裂性：一项体外研究

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AIM: To measure the fracture resistance of over-flared roots filled with a variety of materials (gutta-percha-nano HA, resilon-epiphany, composite and mineral trioxide aggregate - MTA) using the Instron machine test and micro-computed tomography (Micro CT) Scan. In addition, scanning electron microscopy (SEM) images were used to illustrate the type of fracture patterns of the specimens. METHODS: One hundred and twenty extracted human mandibular single-rooted premolars were selected. A total of 105 out of the selected teeth were prepared to the working length and over-flared, leaving the apical 5 mm undisturbed. Fifteen samples had no treatment and were used as a positive control group (Group +ve). The 105 test teeth were further divided into 7 groups of 15 samples each. One of the 7 groups was designated as negative control (Group -ve) where teeth were over prepared and left without obturation. Remaining groups were filled with gutta-percha-nanoHA (Group1), gutta-percha-nano HA+composite (Group 2), gutta-percha-nano HA+MTA (Group 3), resilon-epiphany (Group 4), resilon-epiphany+composite (Group 5), and resilon-epiphany+MTA (Group 6). Fracture resistance of all samples was measured using the Instron testing machine. Three samples from each group had the depth of their fracture line measured by Micro CT Scan, and 2 samples from each group had their fracture pattern illustrated using SEM. RESULTS: The highest fracture resistance was observed in Group +ve, followed by Groups 3, 6, 5, 2, 4, 1, and Group -ve, with values (in N) of: 1598 (641.0), 1190.5(424.2), 1164.7 (489.4), 821.2 (220.9), 683.4(179), 658.4 (211.3), 658.4 (99.0), 158.3(49.3), respectively. Statistical analysis for root fracture resistance showed highly significant difference between all groups with p value < 001. CONCLUSIONS: Micro CT Scan and SEM analysis indicated the ability of MTA to withstand vertical force.
机译：目的：使用Instron机器测试和微型计算机断层扫描技术（Micro-tomography，Micro-CT）测量充满各种材料（gutta-percha-nano HA，resilon-Epiphany，复合材料和三氧化二矿物骨料-MTA）的过度张开的牙根的抗断裂性CT扫描。此外，使用扫描电子显微镜（SEM）图像来说明样品的断裂模式类型。方法：选择120个提取的人类下颌单根前磨牙。总共选择了105颗选定的牙齿，使其达到了工作长度并向外扩口，使根尖5毫米不受干扰。 15个样品未经处理，用作阳性对照组（组+ ve）。将105个测试牙齿进一步分为7组，每组15个样品。 7组中的一组被指定为阴性对照（-ve组），其中牙齿准备过度，并且没有阻塞。剩余的组中充满了gutta-percha-nanoHA（组1），gutta-percha-nano HA +复合材料（组2），gutta-percha-nano HA + MTA（组3），弹力主显节（组4），resilon-主显节+复合物（第5组），以及弹性主显节+ MTA（第6组）。使用Instron测试机测量所有样品的抗断裂性。每组中的三个样品具有通过Micro CT Scan测量的断裂线深度，并且每组中的两个样品具有通过SEM示出的断裂图案。结果：在+ ve组中观察到最高的抗断裂性，其后依次是第3、6、5、2、4、1和-ve组，其值（以N计）为：1598（641.0），1190.5（424.2） ，1164.7（489.4），821.2（220.9），683.4（179），658.4（211.3），658.4（99.0），158.3（49.3）。对牙根抗骨折性的统计分析表明，各组之间的差异非常显着，p值<001。结论：Micro CT扫描和SEM分析表明MTA能够承受垂直力。

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