Jiang Hui-Chao, Tang Ling-Ling, Han Wen-Li
Department of Cariology and Endodontology, Dalian Stomatological Hospital. Dalian 116021, Liaoning Province, China. E-mail:
Shanghai Kou Qiang Yi Xue. 2022 Feb;31(1):44-47.
To compare the shaping ability of 4 nickel-titanium rotary instruments in preparation of curved root canals.
Forty extracted human maxillary first or second molars with mesiobuccal root canal curvature ranging from 20°-40° were selected. The teeth were randomly equally divided into 4 groups(n=10). Mesial root canals were separately prepared using Protaper Universal, Protaper Next, TF, and S3 nickel-titanium instruments. A series of preoperative and postoperative images were taken by Micro-CT． Mimics 17.0 software was used to analyze the following parameters: canal transportation, centering ratio values, root canal volume, volume of removed dentin, and canal/root width ratio. Data analysis was performed by using SPSS 20.0 software package.
In terms of canal transportation after preparation at 1, 3 and 5 mm from the apex, Protaper Universal was more than the other three groups(P＜0.05). The centering ratio value of Protaper Universal was significantly smaller than that of the other three groups at 1 mm from the apex(P＜0.05). The amount of dentin removal was significantly different after instrumentation with the four test systems(P＜0.05). Protaper Universal had the highest mean volume of removed dentin. After preparation, all root canals had a diameter that was not larger than 39% of the root diameter at the coronal and middle segments.
Under the conditions of this study, Protaper Next, TF, S3 systems seem to be better choices than Protaper Universal system in preparing curved root canals.
比较4种镍钛旋转器械在弯曲根管预备中的成形能力。
选取40颗拔除的人上颌第一或第二磨牙，近中颊根根管弯曲度为20°-40°。将牙齿随机均分为4组（n = 10）。分别使用Protaper Universal、Protaper Next、TF和S3镍钛器械预备近中根管。通过Micro-CT拍摄一系列术前和术后图像。使用Mimics 17.0软件分析以下参数：根管偏移、定心比值、根管容积、去除牙本质的体积以及根管/牙根宽度比。使用SPSS 20.0软件包进行数据分析。
在距根尖1、3和5 mm处预备后，Protaper Universal的根管偏移大于其他三组（P＜0.05）。在距根尖1 mm处，Protaper Universal的定心比值明显小于其他三组（P＜0.05）。使用四种测试系统进行器械预备后，去除牙本质的量有显著差异（P＜0.05）。Protaper Universal去除牙本质的平均体积最高。预备后，所有根管在冠部和中部的直径均不大于牙根直径的39%。
在本研究条件下，在弯曲根管预备中，Protaper Next、TF、S3系统似乎比Protaper Universal系统是更好的选择。
