罕见病例报告：第二乳磨牙未萌出于第二前磨牙下方。

A rare case of unerupted second deciduous molar located inferior to the second premolar: case report.

机构信息

Cittadella Hospital, Cittadella, Italy.

出版信息

Eur J Paediatr Dent. 2012 Sep;13(3):236-8.

Abstract

AIM

Tooth eruption is defined as the movement of a tooth from its site of development within the alveolar process to its functional position in the oral cavity [Massler et al., 1941]. The process of tooth eruption can be divided into different phases: pre-eruptive bone stage, alveolar bone stage, mucosal stage, preocclusal stage, occlusal stage and maturation stage [Andreasen et al., 1997]. Any disturbance in these phases can lead to eruptive anomalies. The incidence of unerupted teeth is usually higher among permanent teeth than among deciduous ones [Walker et al., 2004; Otsuka et al., 2001; Amir et al., 1982; Broadway, 1976; Pinborg et al., 1970]. Of the primary teeth reported as unerupted, second primary molars are the teeth most frequently involved [Walker et al., 2004; Otsuka et al., 2001; Bianchi et al., 1991; Ranta et al., 1988; Tsukamoto et al., 1986; Amir et al., 1982], followed by primary central incisors [Otsuka et al., 2001].

CASE REPORT

This paper presents a case of inversion of the intraosseous position of a second unerupted deciduous molar and the succedaneous second premolar.

摘要

目的

牙齿萌出是指牙齿从牙槽骨内的发育部位移动到口腔内的功能位置[Massler 等人，1941]。牙齿萌出的过程可分为不同阶段：萌出前牙槽骨阶段、牙槽骨阶段、黏膜阶段、萌出前阶段、咬合阶段和成熟阶段[Andreasen 等人，1997]。这些阶段中的任何干扰都可能导致萌出异常。未萌出的恒牙发生率通常高于乳牙[Walker 等人，2004；Otsuka 等人，2001；Amir 等人，1982；Broadway，1976；Pinborg 等人，1970]。在报告的未萌出乳牙中，第二乳磨牙是最常涉及的牙齿[Walker 等人，2004；Otsuka 等人，2001；Bianchi 等人，1991；Ranta 等人，1988；Tsukamoto 等人，1986；Amir 等人，1982]，其次是乳中切牙[Otsuka 等人，2001]。