PDF(Pubmed)
Abstract：
UNASSIGNED: This study aimed to evaluate the success rate of bypassing three NiTi rotary files (RaCe®, Hero 642®, and K3®), fractured in various root canal locations of extracted mandibular molars with two different canal curvatures.
UNASSIGNED: Ninety freshly extracted human first or second mandibular molars were selected. Three millimeters of the file tip (RaCe®, Hero 642®, and K3®), was fractured intentionally in the mesiobuccal root canal of each tooth by weakening the file in the last 3 mm of files #30 with 4% taper and preparing the root canals with two different degrees of curvature (n=30). Then, bypass possibility of the fractured files was evaluated using #8, #10, and #15 K-files and compared in different groups. In addition, the rate of accidental procedural errors was compared between these groups. Data were analyzed with univariate analysis and logistic regression models at a significance level of 0.05.
UNASSIGNED: The overall success rate of bypassing was 61.1%. RaCe® files had the highest and the K3® files had the lowest bypass possibility rates (P=0.01); the greater the degree of canal curvature, the less successful the bypass procedure (P=0.01). The fracture of the files used to bypass was the most prevalent error.
UNASSIGNED: Based on this in vitro study the type of fractured file and the amount of canal curvature affected the success rate of the bypassing technique. In RaCe® files and the mild curvature group, the success rate was the highest.
UNASSIGNED: Ninety freshly extracted human first or second mandibular molars were selected. Three millimeters of the file tip (RaCe®, Hero 642®, and K3®), was fractured intentionally in the mesiobuccal root canal of each tooth by weakening the file in the last 3 mm of files #30 with 4% taper and preparing the root canals with two different degrees of curvature (n=30). Then, bypass possibility of the fractured files was evaluated using #8, #10, and #15 K-files and compared in different groups. In addition, the rate of accidental procedural errors was compared between these groups. Data were analyzed with univariate analysis and logistic regression models at a significance level of 0.05.
UNASSIGNED: The overall success rate of bypassing was 61.1%. RaCe® files had the highest and the K3® files had the lowest bypass possibility rates (P=0.01); the greater the degree of canal curvature, the less successful the bypass procedure (P=0.01). The fracture of the files used to bypass was the most prevalent error.
UNASSIGNED: Based on this in vitro study the type of fractured file and the amount of canal curvature affected the success rate of the bypassing technique. In RaCe® files and the mild curvature group, the success rate was the highest.
摘要：
未经评估：本研究旨在评估绕过三个NiTi旋转文件的成功率（RaCe®，英雄642®,和K3®），下颌磨牙的根管位置不同，有两种不同的根管曲率。
未经授权：选择了90颗新鲜提取的人类第一或第二下颌磨牙。三毫米的文件尖端(RaCe®,英雄642®,和K3®），通过以4％的锥度削弱＃30的最后3mm中的牙根管并准备具有两种不同曲率（n=30）的根管，在每颗牙齿的近颊根管中故意骨折。然后，使用#8,#10和#15K文件评估了断裂文件的旁路可能性,并在不同组中进行了比较.此外,比较了这些组的意外程序错误发生率.采用单因素分析和logistic回归模型对数据进行显著性水平为0.05的分析。
UNASSIGNED：旁路的总体成功率为61.1％。RaCe®文件最高，K3®文件最低（P=0.01）；运河弯曲程度越大，旁路手术越不成功(P=0.01)。用于绕过的文件的断裂是最普遍的错误。
UNASSIGNED：基于这项体外研究，断裂文件的类型和运河弯曲量影响了旁路技术的成功率。在RaCe®文件和轻度曲率组中，成功率最高。
未经授权：选择了90颗新鲜提取的人类第一或第二下颌磨牙。三毫米的文件尖端(RaCe®,英雄642®,和K3®），通过以4％的锥度削弱＃30的最后3mm中的牙根管并准备具有两种不同曲率（n=30）的根管，在每颗牙齿的近颊根管中故意骨折。然后，使用#8,#10和#15K文件评估了断裂文件的旁路可能性,并在不同组中进行了比较.此外,比较了这些组的意外程序错误发生率.采用单因素分析和logistic回归模型对数据进行显著性水平为0.05的分析。
UNASSIGNED：旁路的总体成功率为61.1％。RaCe®文件最高，K3®文件最低（P=0.01）；运河弯曲程度越大，旁路手术越不成功(P=0.01)。用于绕过的文件的断裂是最普遍的错误。
UNASSIGNED：基于这项体外研究，断裂文件的类型和运河弯曲量影响了旁路技术的成功率。在RaCe®文件和轻度曲率组中，成功率最高。
