Effective factors including periodontal ligament on vertical root fractures
Effective factors including periodontal ligament on vertical root fractures
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DOI：
10.4012/dmj.24.66
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发表时间：
2005-03-01
影响因子：
2.5
通讯作者：
Suda, H
中科院分区：
文献类型：
--
作者：
Okitsu, M;Takahashi, H;Suda, H
本研究的目的是分析包括牙周韧带在内的影响牙根垂直骨折的因素。根据主尖锉（MAF）大小、加载点和模拟牙周韧带（PDL）的存在，将80颗上颌中切牙分为8组。使用万能试验机用Co-Cr棒垂直按压根管中的杜仲胶。采用有序逻辑分析确定显著因素。88.8%的标本出现vrf，但未发现水平骨折。vrf有三种类型：不累及尖端的部分骨折（PF, 41.3%）、累及尖端的部分骨折（AF, 40.0%）和完全骨折（CF, 7.5%）。MAF大小显著影响vrf (p
The purpose of the present study was to analyze effective factors including periodontal ligament on vertical root fractures (VRFs). Eighty maxillary central incisors were assigned to eight groups, depending on master apical file (MAF) size, loading point and existence of a simulated periodontal ligament (PDL). The gutta-percha in the root canal was vertically pressed with a Co-Cr rod using a universal testing machine. An ordinal logistic analysis was employed to determine significant factors. VRFs were observed in 88.8% of the specimens but no horizontal fractures were found. There were three types of VRFs: partial fracture not involving the apex (PF, 41.3%), partial fracture involving the apex (AF, 40.0%), and complete fracture (CF, 7.5%). MAF size significantly affected VRFs (p