Vardhan Talla Harsha, Shanmugam Subramanyam
Department of Oral Medicine and Radiology, Sibar Institute of Dental Sciences, Guntur, Andhra Pradesh, India.
Quintessence Int. 2010 Feb;41(2):105-7.
Dens evaginatus is a developmental malformation characterized by the presence of an extra cusp that takes the form of a tubercle arising from the occlusal or the lingual surface of the tooth. It is also referred to as talon cusp in the anterior teeth and Leong premolar in the premolars. Dens invaginatus is a deep surface invagination of the crown or the root lined by enamel, dentin, and pulp. Though many case reports of dens evaginatus and dens invaginatus have been found in the literature, an association of both is a rare anomaly. Only two cases of concomitance of dens invaginatus and dens evaginatus have been reported. This article is a case report of dens evaginatus and dens invaginatus involving all four maxillary incisors in a 25-year-old patient.
牙外突是一种发育畸形，其特征为存在一个额外的牙尖，该牙尖呈从牙齿咬合面或舌面长出的结节状。在前牙中它也被称为鹰爪尖，在磨牙中被称为梁氏磨牙。牙内陷是牙冠或牙根的一种深的表面凹陷，内衬釉质、牙本质和牙髓。尽管文献中已发现许多牙外突和牙内陷的病例报告，但两者并存是一种罕见的异常情况。仅报告过两例牙内陷和牙外突并存的病例。本文是一例25岁患者上颌四颗切牙均出现牙外突和牙内陷的病例报告。
