SECONDARY RETENTION OF PERMANENT MOLARS - A HISTOLOGIC-STUDY
SECONDARY RETENTION OF PERMANENT MOLARS - A HISTOLOGIC-STUDY
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DOI：
10.1111/j.1600-0714.1989.tb01338.x
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发表时间：
1989-09-01
影响因子：
3.3
通讯作者：
VISSINK, A
中科院分区：
文献类型：
--
作者：
RAGHOEBAR, GM;BOERING, G;VISSINK, A
继发性固位的病因尚不清楚，但强直通常被认为是乳磨牙的一个重要因素。关于恒牙列中二次固位机制的数据还不够充分，尽管已经提出了强直的可能作用。为了分析二次保留恒牙强直的发生频率和部位，对26颗二次保留磨牙和6颗正常磨牙进行了组织学研究。将这些数据与临床和放射学表现进行比较。所有二次保留磨牙的根部均可观察到强直的区域。在81%的病例中，这些区域位于分叉处和神经根间表面。正常磨牙无强直征象。当这些结果与临床和放射学资料相比较时，很明显后者给出了许多假阴性结果，因为强直的面积往往太小，临床或放射学无法发现。
The etiology of secondary retention is not well understood, bu ankylosis is often considered to be an important factor in primary molars. Data concerning the mechanism of secondary retention in the permanent dentition are insufficient, although a possible role of ankylosis has been suggested. In order to analyze the frequency of occurrence and localization of ankylosis in secondarily retained permanent teeth, 26 secondarily retained molars and for comparison six normal molars were studied histologically. These data were compared with the clinical and radiographic findings. Areas of ankylosis were observed along the roots of all secondarily retained molars. In 81% of the cases these areas were located at the bifurcation and interradicular root surface. No signs of ankylosis were found in normal molars. When these results were compared with the clinical and radiographic data, it was obvious that the latter gave many false negative results, because the areas of ankylosis were often too small to be detected clinically or radiographically.