Yang Lin, Chen Xinyu, Tian Cheng, Han Ting, Wang Yan
Department of Endodontics, School and Hospital of Stomatology, Shandong University, Shandong Provincial Key Laboratory of Oral Biomedicine, Jinan, China.
Department of Endodontics, School and Hospital of Stomatology, Shandong University, Shandong Provincial Key Laboratory of Oral Biomedicine, Jinan, China.
J Endod. 2014 May;40(5):630-4. doi: 10.1016/j.joen.2014.01.007. Epub 2014 Mar 14.
The aim of this study was to investigate root canal morphology and locate root canal orifices of maxillary second premolars in a Chinese subpopulation using cone-beam computed tomographic imaging.
A total of 392 cone-beam computed tomographic images of maxillary second premolars were obtained from 238 patients who required a preoperative assessment for implant surgery or orthodontic treatment. The number of roots and root canals and root canal configuration were investigated and categorized using Vertucci's criteria. The distance between the root canal orifice and the anatomic apex and the distance between root canal orifices in those teeth with 2 root canals were measured and evaluated. The Fisher exact test was used to analyze the correlation between the number of roots and sex.
Among the 392 teeth, 86.5% (n = 339) had 1 root; 45.4% (n = 178) of the teeth had 1 root canal, and 54.3% (n = 213) had 2 root canals that ranged from type II-type V. The majority of teeth with 2 root canals showed a type IV canal configuration (n = 79, 20.2%) followed by type II (n = 64, 16.3%), type III (n = 45, 11.4%), and type V (n = 25, 6.4%). Only 1 tooth had 3 root canals. No significant difference was found between the number of roots and sex (P > .05). Among the 213 teeth with 2 root canals, the most frequent distribution of the distance between the root canal orifice and the anatomic apex was 5-10 mm (n = 157). The distance between the 2 orifices of 189 teeth was 1-4 mm.
The frequency of teeth with 2 root canals was high in maxillary second premolars. The internal morphology of teeth with 2 root canals was variable. This study provided useful information about the root canal morphology of maxillary second premolars in a Chinese subpopulation.
本研究旨在使用锥形束计算机断层扫描成像技术，调查中国人群中上颌第二前磨牙的根管形态并确定根管口位置。
从238名需要进行种植手术或正畸治疗术前评估的患者中获取了392张上颌第二前磨牙的锥形束计算机断层扫描图像。使用韦尔图奇标准对牙根和根管数量以及根管形态进行调查和分类。测量并评估了有2个根管的牙齿中根管口与解剖根尖之间的距离以及根管口之间的距离。采用Fisher精确检验分析牙根数量与性别之间的相关性。
在392颗牙齿中，86.5%（n = 339）有1个牙根；45.4%（n = 178）的牙齿有1个根管，54.3%（n = 213）有2个根管，根管类型从II型到V型。大多数有2个根管的牙齿呈现IV型根管形态（n = 79，20.2%），其次是II型（n = 64，16.3%）、III型（n = 45，11.4%）和V型（n = 25，6.4%）。只有1颗牙齿有3个根管。牙根数量与性别之间未发现显著差异（P > .05）。在213颗有2个根管的牙齿中，根管口与解剖根尖之间距离最常见的分布是5 - 10毫米（n = 157）。189颗牙齿的两个根管口之间的距离为1 - 4毫米。
上颌第二前磨牙中有2个根管的牙齿频率较高。有2个根管的牙齿内部形态多样。本研究为中国人群中上颌第二前磨牙的根管形态提供了有用信息。
