Gupta Alpa, Duhan Jigyasa, Wadhwa Jitesh
Department of Conservative Dentistry and Endodontics, Postgraduate Institute of Dental Sciences, Rohtak, Haryana, India.
Department of Orthodontics, K. D. Dental College, Mathura, Uttar Pradesh, India.
Contemp Clin Dent. 2017 Jan-Mar;8(1):38-41. doi: 10.4103/ccd.ccd_699_16.
Mandibular first molars typically have two roots but sometimes a supernumerary root presents distolingually called as radix entomolaris (RE).
The present study evaluated the prevalence of permanent mandibular first molars featuring a distolingual root in Haryana (North India).
Five hundred patients possessing bilateral mandibular first molars were selected for this study. The intraoral periapical radiographs were taken. The radiographs of these patients were evaluated under optimal conditions. A total of 1000 mandibular first molars were screened, and the incidence of three-rooted mandibular first molars, RE and the correlation between left and right side occurrence and between either gender were recorded.
The binary logistic regression test and Pearson's Chi-square test were used for statistical analysis.
The prevalence of three-rooted permanent mandibular first molars was 13% of the patients examined and 8.3% of the teeth examined. There was no statistically significant difference between gender and side of occurrence ( ≥ 0.05). The bilateral incidence of a symmetric distribution was 27.6 (18/65) among the RE teeth examined.
RE is considered as an Asiatic trait. The occurrence of this macrostructure in the Haryana (North India) population was found to be 13%. The clinician must thoroughly examine the radiographs before the initiation of endodontic therapy.
下颌第一磨牙通常有两个牙根，但有时会出现一个位于远舌侧的额外牙根，称为远舌根（RE）。
本研究评估了哈里亚纳邦（印度北部）恒牙下颌第一磨牙远舌根的患病率。
选取500例双侧下颌第一磨牙患者进行本研究。拍摄口腔内根尖片。在最佳条件下对这些患者的X线片进行评估。共筛查了1000颗下颌第一磨牙，记录了三根下颌第一磨牙、远舌根的发生率以及左右侧出现情况之间和不同性别之间的相关性。
采用二元逻辑回归检验和Pearson卡方检验进行统计分析。
三根恒牙下颌第一磨牙的患病率在受检患者中为13%，在受检牙齿中为8.3%。性别和出现侧别之间无统计学显著差异（≥0.05）。在所检查的远舌根牙齿中，对称分布的双侧发生率为27.6（18/65）。
远舌根被认为是一种亚洲特征。在哈里亚纳邦（印度北部）人群中发现这种宏观结构的发生率为13%。临床医生在开始牙髓治疗前必须彻底检查X线片。
