Jain Atul, Bahuguna Rachana
Professor, Department of Conservative Dentistry and Endodontics, K. M. Shah Dental College & Hospital, Gujarat, India.
Dent Res J (Isfahan). 2011 Summer;8(3):118-22.
Knowledge about root canal morphology and its frequent variations can exert considerable influence on the success of endodontic treatment. The aim of this study was to survey the root canal morphology of mandibular first premolar teeth in a Gujarati population by decalcification and clearing technique.
One hundred thirty eight extracted mandibular first premolar teeth were collected from a Gujarati population. After decalcifying and clearing, the teeth were examined for tooth length, number of cusps and roots, number and shape of canal orifices and canal types.
The average length of mandibular first premolar teeth was 21.2 mm. All the teeth had 2 cusps. One hundred thirty four teeth (97.1%) had one root, and just 4 teeth (2.89%) had two roots. Mesial invagination of root was found in 21 teeth (15.21%). One canal orifice was found in 122 teeth (88.4%) and two canal orifices in 16 teeth (11.59%). Shape of orifices was found to be round in 46 teeth (33.33%), oval in 72 teeth (52.17%) and flattened ribbion in 20 teeth (14.49%). According to Vertucci's classification, Type I canal system was found in 93 teeth (67.39%), Types II,III,IV,V,and VI in 11 teeth (7.97%), 5 teeth (3.62%), 4 teeth (2.89%), 24 teeth (17.39%), and 1 tooth (0.72%) respectively.
Mandibular first premolar teeth were mostly found to have one root and Type I canal system.
关于根管形态及其常见变异的知识会对牙髓治疗的成功产生重大影响。本研究的目的是通过脱钙和透明技术调查古吉拉特人群下颌第一前磨牙的根管形态。
从古吉拉特人群中收集了138颗拔除的下颌第一前磨牙。脱钙和透明处理后，检查牙齿的长度、尖和根的数量、根管口的数量和形状以及根管类型。
下颌第一前磨牙的平均长度为21.2毫米。所有牙齿均有2个尖。134颗牙齿（97.1%）有1个根，只有4颗牙齿（2.89%）有2个根。21颗牙齿（15.21%）发现有牙根内陷。122颗牙齿（88.4%）有1个根管口，16颗牙齿（11.59%）有2个根管口。发现46颗牙齿（33.33%）的根管口形状为圆形，72颗牙齿（52.17%）为椭圆形，20颗牙齿（14.49%）为扁平带状。根据Vertucci分类，I型根管系统在93颗牙齿（67.39%）中发现，II、III、IV、V和VI型分别在11颗牙齿（7.97%）、5颗牙齿（3.62%）、4颗牙齿（2.89%）、24颗牙齿（17.39%）和1颗牙齿（0.72%）中发现。
下颌第一前磨牙大多有1个根和I型根管系统。
