To investigate the prevalence of eight morphological and numerical anomalies in the southern Chinese permanent dentition and to compare these with studies from different populations.
Materials and Methods:
The material used in the study consisted of study models and panoramic radiographs collected from 725 randomly selected 12-year-old children (358 males and 367 females). The anomalies were assessed using diagnostic criteria that have been most often cited in the published literature.
Of the eight dental anomalies studied, the prevalence of hyperdontia (2.6%) was higher than reported for Caucasians, and double tooth (0.8%) and dens evaginatus (4.7%) were the highest amongst all of the populations. Although the prevalence of hypodontia (7.3%) is comparable to that of other populations, mandibular incisors were the most frequently missing teeth in southern Chinese (5.6%) and this finding contradicted those from studies of other ethnic groups.
Higher prevalences of double tooth, dens evaginatus and missing mandibular incisors can be considered to be characteristics of the southern Chinese permanent dentition.