A Study of Anatomic Characteristics of Distolingual Root of Permanent Mandibular Molars in Taiwanese Population

臺灣人下顎臼齒區遠心舌側牙根的解剖特性之研究

劉家玲(Chia-Ling Liu) ； 黃國精(Kuo-Ching Huang) ； 林玫吟(Mei-Yin Lin) ； 陳俊榮(Chun-Jung Chen) ； 陳雅惠(Melody Yea-Huey Chen)

《臺灣牙周病醫學會雜誌》 20卷3期 (2015/09) Pp. 185-193

https://doi.org/10.6121/TAP.2015.20.3.04

摘要

背景：藉電腦斷層掃描影像分析臺灣地區人種下顎臼齒區有遠心舌側牙根的盛行率，牙根分岔位置及牙根長度，希望能提供牙周病預後以及治療策略參考。方法：針對2011年到2013年間接受下顎電腦斷層檢查的病患，其中排除雙側缺牙或牙冠有贗復物者。用3-D重建軟體觀察雙側下顎大臼齒遠心舌側牙根的發生機率，並且在有遠心舌側牙根的情況下，分別測量遠心頰側、遠心舌側牙根長度及頰側、舌側、遠心牙根幹長度，並加以分析。結果：下顎第一大臼齒遠心舌側牙根的盛行率是13.96%，第二大臼齒是0.77%，第一大臼齒的盛行率明顯高於第二大臼齒（p＜0.0001），第一大臼齒雙側同時發生的比例為7.35%，遠心牙根幹的長度比頰側、舌側長（p＜0.0001），遠心頰側牙根比遠心舌側牙根長度長（p＜0.05），遠心分岔位置偏向舌側（p＜0.05）。結論：由結果可知臺灣族群的遠心牙根盛行率明顯比其他地區高，以及瞭解解剖形態變異的特性。臨床上不可忽視其重要性。（臺灣牙周醫誌，20（3）:185-193,2015）

關鍵字

形態變異 ； 遠心舌側牙根 ； 下顎大臼齒

並列摘要

＂Background＂: There are some morphological variants that may have a negative impact on the periodontal disease progression and treatment outcome. However, parts of these variants were found with racial predilection. The purpose of this study was to investigate the prevalence and anatomic characteristic of the distolingual root in the mandibular molar area in Taiwanese population through computed tomography images. ＂Material and Methods＂: Subjects were patients receiving mandibular computed tomography between 2011 and 2013 at Chi-Mei medical center. Those with missing teeth on both sides or with prosthesis with were excluded. Total 261 patients with computed tomography images of the mandibular molar teeth were included in the study. With 3-D image reconstruction software, the prevalence of the distolingual root, the roots length and the root trunks length of bilateral mandibular molar were measured and analyzed. ＂Results＂: The prevalence rate of disto-lingual root was 13.96% for the mandibular first molar and 0.77% for the mandibular second molar; the prevalence rate in the first molar was significantly higher than that in the second molar (p＜0.0001). Concurrent incidence on both sides of the first molar accounted for 7.35%. The distal root trunk was significantly longer than buccal and lingual root trunks (p＜0.0001). The disto-buccal root was significantly longer than the disto-lingual root (p＜0.05). The distal furcation was closer to the lingual side (p＜0.05). ＂Conclusion＂: The prevalence rate of disto-lingual rootof the mandibular first molar was obviously higher in the Taiwan population than in other regions and it helped with the understanding of anatomic morphological variants. The importance should not be ignored in the clinical setting.

並列關鍵字

morphological variants ； distolingual root ； mandibular molar ； radix entomolaris