Root and Root Canal Morphology in Maxillary Second Molar with Fused Root from a Native Chinese Population
Root and Root Canal Morphology in Maxillary Second Molar with Fused Root from a Native Chinese Population
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中国本土人群上颌第二磨牙融合牙根的根管形态
DOI：
10.1016/j.joen.2013.10.035
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发表时间：
2014-06-01
影响因子：
4.2
通讯作者：
Gutmann, James L.
中科院分区：
文献类型：
--
作者：
Zhang, Qiyuan;Chen, Hao;Gutmann, James L.
简介：牙根融合是上颌第二磨牙的一种解剖变异，然而，这种根管形态与牙根解剖结构的关系尚未完全阐明。本研究的目的是探讨融合根的特点和根管解剖的MSM使用微型计算机断层成像之间的关系。研究方法：用mu CT 50（瑞士巴塞尔斯多夫的Soho Medical）扫描187个提取的MSM，并使用Yang和Vertucci提出的分类对它们的根管和根管形态进行分类和分析。记录不同类型根管融合后根管的数目和位置，并进行比较。结果：108例（57.75%）有3个独立的牙根，79例（42.25%）有融合的牙根。在79个融合根中，22个根管部分融合，6个根管完全融合。三根融合的根管合并率高于二根融合的根管合并率（P <0.05）。在28个合并的根管中，16个发生在近中颊根和远中颊根之间，9个发生在近中颊根、远中颊根和腭根之间。结论：融合根的MSM可能由于根管合并而形成复杂的根管系统。
Introduction: Root fusion is an anatomic variation in maxillary second molars (MSMs); however, the nature of this canal morphology as it relates to its root anatomy has not been fully clarified. The purpose of this study was to investigate the relationship between features of fused roots and root canal anatomy in MSMs using micro computed tomographic imaging. Methods: One hundred eighty-seven extracted MSMs were scanned with the mu CT50 (Scanco Medical, Bassersdorf, Switzerland), and their root and canal morphology was classified and analyzed using the classifications proposed by Yang and Vertucci. The number and position of canals that merged were recorded and compared among different root fusion types. Results: One hundred eight (57.75%) MSMs had 3 separate roots, and 79 (42.25%) had fused roots. Of the 79 fused roots, 22 showed partial canal merging, and 6 had complete canal merging. Canal merging was found with teeth with 3-root fusion more often than in those with 2-root fusion (P < .05). Of 28 merged canals, 16 occurred between mesiobuccal and distobuccal canals and 9 among mesiobuccal, distobuccal, and palatal canals. Conclusions: MSMs with fused roots may present a complicated root canal system as a result of canal merging.