Sheikhi Mahnaz, Sadeghi Mohammad Ali, Ghorbanizadeh Sajad
Torabinejad Research Center and Department of Oral and Maxillofacial Radiology, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
Dent Res J (Isfahan). 2012 Dec;9(Suppl 1):105-11.
Hypodontia or congenitally missing teeth is among dental anomalies with different prevalence in each region. The aim of this study was to evaluate the prevalence of congenitally missing permanent teeth in Iranian population.
A descriptive, retrospective and cross-sectional study was done. Panoramic radiographs of 2422 Iranian patients (1539 girls and 883 boys), 7-25 years old, were collected. The radiographs were studied for evidence of congenitally missing teeth. Data were analyzed using Paired t-test, Mann-Whitney test, Fisher exact test and Chi-square test (α = 0.05).
Prevalence of congenitally missing teeth was totally 45.7% and 34.8% for third molars. The most frequent congenitally missing teeth was mandibular second premolars (23.34%) followed by maxillary second premolars (22.02%). Upper jaw showed significantly higher number of congenitally missing teeth (P value < 0.001). According to Chi-square test, congenital missing teeth was found approximately 10.9% in both females and males and there were no statistically significant difference between sexes (P = 0.19).
The prevalence of congenitally missing teeth (CMT) in Iranian permanent dentition was 10.9%. The most common congenitally missing teeth were mandibular second premolar fallowed by maxillary second premolars.
缺牙症或先天性缺牙是一种牙列异常，在每个地区的患病率各不相同。本研究的目的是评估伊朗人群中先天性恒牙缺失的患病率。
开展了一项描述性、回顾性横断面研究。收集了2422名7至25岁伊朗患者（1539名女孩和883名男孩）的全景X线片。对这些X线片进行研究以寻找先天性缺牙的证据。使用配对t检验、曼-惠特尼检验、费舍尔精确检验和卡方检验（α = 0.05）对数据进行分析。
先天性缺牙的总体患病率为45.7%，第三磨牙的患病率为34.8%。最常先天性缺失的牙齿是下颌第二前磨牙（23.34%），其次是上颌第二前磨牙（22.02%）。上颌先天性缺失的牙齿数量明显更多（P值<0.001）。根据卡方检验，女性和男性先天性缺牙的发生率均约为10.9%，性别之间无统计学显著差异（P = 0.19）。
伊朗恒牙列中先天性缺牙（CMT）的患病率为10.9%。最常见的先天性缺失牙齿是下颌第二前磨牙，其次是上颌第二前磨牙。
