Sant'Anna-Júnior Arnaldo, Duarte Marco A H, Guerreiro-Tanomaru Juliane M, Tanomaru-Filho Mário
Restorative Dentistry, Araraquara Dental School, São Paulo State University, Araraquara, SP, Brazil.
Acta Odontol Latinoam. 2010;23(1):38-41.
This aim of this study was to evaluate the root apex of mandibular premolars regarding the presence of main and accessory foramina. The root apexes from fifty extracted mandibular single-rooted premolars were examined by scanning electron microscopy (SEM). The apical openings had their diameter measured and were identified as main or accessory foramina. Double blinded and calibrated examiners analyzed the SEM photographs and classified the premolar roots into three types, based on the presence and size of the apical openings. Type I: roots with a single main apical foramen and no accessory foramina; type II: roots with a main foramen and one or more accessory foramina; type III: roots with accessory foramina only. For the first premolar, 16 roots were classified as type I (48.48%), 4 as type II (12.12%) and 13 as type III (39.40%). For the second premolars, 10 roots were classified as type I (58.83%), 3 as type II (17.65%) and 4 as type III (23.52%). The high incidence of roots with accessory foramina only (type III), mainly in the first premolar, warns of the need for caution during working length determination and apical debridement.
本研究的目的是评估下颌前磨牙根尖主根管口和副根管口的情况。通过扫描电子显微镜（SEM）检查了50颗拔除的下颌单根前磨牙的根尖。测量根尖孔的直径，并将其确定为主根管口或副根管口。双盲且经过校准的检查人员分析SEM照片，并根据根尖孔的存在情况和大小将前磨牙根分为三种类型。I型：具有单个主根尖孔且无副根管口的根；II型：具有主根管口和一个或多个副根管口的根；III型：仅具有副根管口的根。对于第一前磨牙，16根被分类为I型（48.48%），4根为II型（12.12%），13根为III型（39.40%）。对于第二前磨牙，10根被分类为I型（58.83%），3根为II型（17.65%），4根为III型（23.52%）。仅具有副根管口的根（III型）的高发生率，主要在第一前磨牙中，警示在确定工作长度和根尖清创时需要谨慎。
