Güven Yeliz
Department of Pedodontics, İstanbul University, Faculty of Dentistry, İstanbul, Turkey.
Eur Oral Res. 2018 Jan;52(1):1-5. doi: 10.26650/eor.2018.45227. Epub 2018 Jan 1.
The aim of this study was to investigate the prevalence and characteristics of ectopically erupting first permanent molars (FPMs) in children attending the clinics of the Pediatric Dentistry Department at İstanbul University.
This retrospective study was performed using panoramic radiographs of 7,649 patients (3,506 females and 4,143 males) aged from 5 to 11 years. The age and gender of the subjects, the number and location of the ectopic molars, bilateral versus unilateral occurrence, the degree of resorption of the roots of the primary molars, and other associated dental anomalies were assessed. Ectopic eruption was categorized according to a grading system based on the resorption rates of the primary molars.
Of the 7,649 reviewed subjects, 203 (118 males and 85 females) were diagnosed with ectopic eruption of the FPMs, resulting in a frequency of 2.65%. The mean age of the subjects with ectopic FPMs was 6.82±1.25 (range: 5-11) years. Of the 273 ectopic FPMs, 157 (57.5%) were detected in the maxilla and 116 (42.5%) in the mandible. Severe and very severe degrees of ectopic eruption were found to be more common in the maxilla than in the mandible, whereas a moderate degree of ectopic eruption was more prevalent in the mandible (p=0.251).
To our knowledge, this is the first study in a Turkish population reporting the prevalence of ectopic eruption of FPMs. Although the difference between the right and the left sides was not significant, the severity of ectopic eruption was different between the maxilla and the mandible.
本研究旨在调查就诊于伊斯坦布尔大学儿童牙科诊所的儿童中，第一恒磨牙异位萌出的患病率及特征。
本回顾性研究使用了7649例年龄在5至11岁患者（3506名女性和4143名男性）的全景X线片。评估了受试者的年龄和性别、异位磨牙的数量和位置、双侧与单侧发生情况、乳磨牙牙根的吸收程度以及其他相关牙齿异常情况。根据基于乳磨牙吸收速率的分级系统对异位萌出进行分类。
在7649例被审查的受试者中，203例（118名男性和85名女性）被诊断为第一恒磨牙异位萌出，患病率为2.65%。异位萌出的第一恒磨牙受试者的平均年龄为6.82±1.25岁（范围：5至11岁）。在273颗异位萌出的第一恒磨牙中，157颗（57.5%）在上颌被检测到，116颗（42.5%）在下颌被检测到。发现上颌中重度和极重度异位萌出比下颌更常见，而下颌中度异位萌出更为普遍（p = 0.251）。
据我们所知，这是第一项报道土耳其人群中第一恒磨牙异位萌出患病率的研究。虽然左右侧之间的差异不显著，但上颌和下颌异位萌出的严重程度不同。
