Kazanci Fatih, Celikoglu Mevlut, Miloglu Ozkan, Yildirim Hanifi, Ceylan Ismail
Department of Orthodontics, Faculty of Dentistry, Yuzuncuyil University, Van, Turkey.
Eur J Dent. 2011 Jul;5(3):361-5.
The aim of this study was to investigate the frequency and characteristics of mesiodens among a group of orthodontic patients in Turkey.
A retrospective study was performed using panoramic radiographs of 3,351 patients ranging in age from 8 to 16 subjected to dental treatment in the Department of Oral and Maxillofacial Radiology and Department of Orthodontics (Erzurum, Turkey) between 1996 and 2008. All medical and demographic data (age and sex) were obtained from the files. Descriptive characteristics of mesiodentes, including number, shape, position, complication caused by mesiodens and treatment were recorded. The Chi-squared test was used.
Results show that the frequency of mesiodens was 0.3% with the ratio of boys (6 cases) to girls (4 cases) being 1.5:1 and this was not statistically significant (P>.05). Of the 10 children, 8 (80.0%) had 1 mesiodens and 2 (20.0%) had 2 mesiodentes bilaterally to midline. Of the 12 mesiodentes, 8 (66.7%) were fully impacted, 7 (58.3%) in a vertical position and 9 (75.0%) conical shape. The most common complication caused by mesiodens was delayed eruption of the permanent incisors in 4 cases (40.0%).
The frequency of mesiodens in Turkish orthodontic patients was found to be 0.3% and more frequently in males with the ratio being approximately 1.5:1. Most of the mesiodentes were in conical shape (75.0%). Sixty-seven percent of the cases were fully impacted.
本研究旨在调查土耳其一组正畸患者中额外牙的发生率及特征。
进行一项回顾性研究，使用了1996年至2008年间在土耳其埃尔祖鲁姆口腔颌面放射科和正畸科接受牙科治疗的3351例年龄在8至16岁患者的全景X线片。所有医学和人口统计学数据（年龄和性别）均从档案中获取。记录额外牙的描述性特征，包括数量、形状、位置、额外牙引起的并发症及治疗情况。采用卡方检验。
结果显示，额外牙的发生率为0.3%，男孩（6例）与女孩（4例）的比例为1.5:1，差异无统计学意义（P>0.05）。在这10名儿童中，8名（80.0%）有1颗额外牙，2名（20.0%）在中线两侧各有2颗额外牙。在12颗额外牙中，8颗（66.7%）完全阻生，7颗（58.3%）呈垂直位，9颗（75.0%）呈锥形。额外牙最常见的并发症是4例（40.0%）恒牙切牙萌出延迟。
在土耳其正畸患者中，额外牙的发生率为0.3%，男性更为常见，比例约为1.5:1。大多数额外牙呈锥形（75.0%）。67%的病例为完全阻生。
