Department of Orthodontics, Medical University of Warsaw, Warsaw, Poland.
Acta Odontol Scand. 2012 Mar;70(2):154-9. doi: 10.3109/00016357.2011.600710. Epub 2011 Jul 25.
Congenital absence of tooth germs and presence of supernumerary teeth (CHH) are anomalies which are classified as embryologically determined disorders. Both disorders can occur together (CHH), but relatively rarely.
The aim of the present study was to present and analyze nine cases collected during the past 24 years, where congenitally missing teeth occurred with supernumerary teeth in the same patient.
Dental records, radiographs and casts of nine patients, six boys and three girls (aged 9-29 years, mean age: 19 years) were examined. All the family members of the patients were also investigated regarding the presence of tooth disorders.
The boys showed hypo-hyperodontia twice as often as the girls (6:3). Congenital absence of tooth germs was more common than the presence of supernumerary teeth (25:11). CAP were not present in the other family members.
The full diagnosis of hypo-hyperodontia is only possible on the basis of radiographic examination, because some teeth may remain unerupted or missing. The results of this study showed that concomitant hypo-hyperodontia is rare and sex-related, with predominance of hypodontia. The genetic influence seems unclear.
先天性牙胚缺失和多生牙（CHH）是两种被归类为胚胎发育障碍的异常。这两种疾病可以同时发生（CHH），但相对较少见。
本研究旨在介绍和分析过去 24 年收集的 9 例同时存在先天性缺牙和多生牙的患者。
检查了 9 名患者（6 名男孩，3 名女孩；年龄 9-29 岁，平均年龄：19 岁）的牙科记录、X 光片和模型。还对所有患者的家庭成员进行了牙齿异常情况的调查。
男孩出现牙数不足/过多的频率是女孩的两倍（6:3）。先天性牙胚缺失比多生牙更为常见（25:11）。其他家庭成员均未出现 CAP。
只有通过放射检查才能对牙数不足/过多做出完整诊断，因为有些牙齿可能未萌出或缺失。本研究结果表明，同时存在牙数不足/过多的情况较为罕见，且与性别有关，以牙数不足为主。遗传影响似乎并不明确。
