Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-Sen University, No.56, Lingyuan West Road, Guangzhou, 510055, China.
Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, China.
BMC Oral Health. 2023 Aug 29;23(1):606. doi: 10.1186/s12903-023-03315-1.
A protostylid is a relatively rare dental developmental aberration characterized as an extra cusp located on the mesial half of the buccal surface of the molars. A protostylid is rarely to be reported due to its low rate of occurrence. This case report describes a patient referred for endodontic treatment due to the presence of a protostylid on the buccal surface of the maxillary first molar that induced apical periodontitis.
A 53-year-old female reported a 3-month history of pain of chewing with her upper left posterior teeth over 3 months. In the clinical examination, an abraded anomalous cusp-like structure was found on the buccal surface of tooth 26, Cone beam computed tomography (CBCT) revealed a supernumerary cusp with an intact root canal inside, which was fused with the mesiobuccal (MB) root canal in the middle of the root. In addition, extensive periapical radiolucency was observed around tooth 26. The tooth was diagnosed as apical periodontitis, and endodontic treatment was performed. The initial lesion in tooth 26 gradually healed over 1 year of observation.
To our knowledge, this case is the first to describe the endodontic management of a maxillary first molar with a protostylid and advances our understanding of supernumerary cusps. This case provides a reference for the treatment of protostylid.
原基牙是一种相对罕见的牙发育异常，特征为位于磨牙颊面近中半的额外牙尖。由于发生率低，原基牙很少被报道。本病例报告描述了一例因上颌第一磨牙颊面存在原基牙而导致根尖周炎的患者，该患者接受了牙髓治疗。
一名 53 岁女性因左上后牙咀嚼疼痛 3 个月就诊。临床检查发现 26 牙颊面有磨损的异常尖状结构，锥形束 CT（CBCT）显示有一个额外的牙尖，其内有完整的根管，与根中部的近中颊（MB）根管融合。此外，还观察到 26 牙周围有广泛的根尖透光区。该牙被诊断为根尖周炎，并进行了牙髓治疗。经过 1 年的观察，26 牙的初始病变逐渐愈合。
据我们所知，本例是首例描述上颌第一磨牙原基牙的牙髓治疗病例，加深了我们对额外牙尖的认识。本病例为原基牙的治疗提供了参考。
