Double Roots of Mandibular Premolar in Full-mouth Periapical Films

Ling-jia Kong; Kuo Wan; Deng-gao Liu

摘要

Objective To evaluate the incidence of two-rooted mandibular premolar morphology using full-mouth periapical film series in a Chinese population, with particular emphasis on bilateral incidence, so as to provide a clinical anatomical basis for root canal treatment in mandibular premolars. Methods A total of 2015 patients who underwent dental treatment and had full mouth periapical radiographs at the Peking University School of Stomatology from April 2011 to April 2012 were enrolled in this study. Three experienced dentists reviewed the patients' periapical films and classified the root morphology of mandibular premolars bilaterally. The incidence of unilateral and bilateral double roots were recorded and calculated, including confirmed and suspected bucco-lingual root types. Results In terms of the morphology of two-rooted mandibular first premolars, of the 2015 cases with complete root formation, two-rooted first premolars were detected in 120 cases, with a total number of 159 teeth. According to the number of teeth, the overall incidence of double roots was 4.03% (159/3972). In terms of the morphology of two-rooted mandibular second premolars, of the 2015 cases with complete root formation, two-rooted second premolars were detected in 24 cases, with a total number of 33 teeth. According to the number of teeth, the overall incidence of double roots was 0.85% (33/3880). Conclusions The roots of mandibular premolars display specific morphological patterns. Based on a large sample, we observed and calculated not only the occurrence rate of bucco-lingual and mesio-distal double roots in first and second mandibular premolars, but also the incidence of unilateral or bilateral double roots within the same mandible. These findings could provide useful information on the anatomical structure of mandibular premolars for endodontic, prosthodontic and surgical procedures, and could improve the quality of treatment and reduce complications.

机译：目的探讨全口根尖膜系列在中国人群中双根下颌前磨牙形态的发生率，特别侧重于双侧发病率，为下颌前磨牙的根管治疗提供临床解剖学依据。方法收集2011年4月至2012年4月在北京大学口腔医学院接受牙科治疗并经全口根尖周放射照相的2015年患者。三位经验丰富的牙医检查了患者的根尖周膜，并对双侧下颌前磨牙的根部形态进行了分类。记录和计算单侧和双侧双根的发生率，包括已确认和怀疑的舌舌根类型。结果在2015年牙根完全形成的病例中，根据两根下颌第一前磨牙的形态，在120例中检出了两根第一磨牙，共159颗牙齿。根据牙齿的数量，双根的总发生率为4.03％（159/3972）。就两根下颌第二前磨牙的形态而言，在2015年完全根形成的病例中，在24例中检出了两根第二前磨牙，总共33颗牙齿。根据牙齿的数量，双根的总发生率为0.85％（33/3880）。结论下颌前磨牙的根部表现出特定的形态特征。在大量样本的基础上，我们不仅观察并计算了下颌第一前磨牙和第二前磨牙颊舌和近中距双根的发生率，而且还计算了同一下颌骨中单侧或双侧双根的发生率。这些发现可以提供有关下颌前磨牙的根管解剖，牙齿修复和手术程序的有用信息，并可以提高治疗质量并减少并发症。

Double Roots of Mandibular Premolar in Full-mouth Periapical Films

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