Raghoebar G M, van Koldam W A, Boering G
Department of Oral and Maxillofacial Surgery, University Hospital Groningen, The Netherlands.
Am J Orthod Dentofacial Orthop. 1990 Jan;97(1):82-4. doi: 10.1016/S0889-5406(05)81713-5.
Secondary retention refers to cessation of eruption of a tooth after its emergence. It occurs mainly in the deciduous dentition, but it is also seen on rare occasions in the permanent dentition. Although ankylosis has been suggested as the main etiologic factor, the exact biologic mechanism of secondary retention is not yet known. This article presents a case of spontaneous reeruption of a secondarily retained permanent molar, which is very rare. It also describes an unusual migration of a lower third molar in the same patient.
继发性阻萌是指牙齿萌出后萌出停止。它主要发生在乳牙列，但在恒牙列中也有罕见病例。虽然有人提出牙根粘连是主要病因，但继发性阻萌的确切生物学机制尚不清楚。本文报告了一例继发性阻萌的恒牙磨牙自发再萌出的病例，这非常罕见。文中还描述了同一患者下颌第三磨牙的异常移位情况。
