Borghesi Andrea, Michelini Silvia, Tononcelli Elena, Maroldi Roberto
Department of Radiology, Medical School, University of Brescia, Piazzale Spedali Civili, 1, Brescia I-25123, Italy.
Department of Radiology, Fondazione Poliambulanza Istituto Ospedaliero, Brescia, Italy.
Radiol Case Rep. 2019 Jul 13;14(9):1113-1116. doi: 10.1016/j.radcr.2019.06.024. eCollection 2019 Sep.
Permanent maxillary second molars (MSMs) are the most difficult teeth to treat endodontically because of their complex root canal system. Most MSMs have 3 roots with 3 root canals; however, variations in the root canal configuration and in the number of roots are common. The presence of extra roots in MSMs has been described by several authors, and the reported incidence of 4-rooted MSMs ranges from 0.98% to 5.6%. However, extremely few cases have been reported in the literature in which a living human subject was found to have a 5-rooted MSM. The present report describes the first case of a 5-rooted MSM in a white European subject diagnosed by cone-beam computed tomography.
由于上颌第二恒磨牙（MSM）根管系统复杂，是最难进行牙髓治疗的牙齿。大多数MSM有3个牙根和3个根管；然而，根管形态和牙根数量的变异很常见。几位作者都描述过MSM存在额外牙根的情况，报道的四根管MSM发生率在0.98%至5.6%之间。然而，文献中报道的活体人类受试者中发现五根管MSM的病例极少。本报告描述了首例通过锥形束计算机断层扫描诊断出的一名白人欧洲受试者的五根管MSM病例。
