Non-syndromic hypodontia of permanent dentition associated with other dental anomalies in children and adolescents.

Anomalies of permanent dentition, by the frequency of the cases, also correspond to some unanimously recognized problems of public health. The objective of this study is to determine the prevalence of non-syndromic hypodontia and oligodontia and to identify the types of associated dental anomalies in the permanent dentition of children and adolescents in the NW of Romania. The study was conducted between 2008 and 2015 on a group of 566 children aged between 12-18 years old. Dental agenesis was diagnosed using clinical and radiological criteria. The numbers and types of teeth missing were noted. Third molars were excluded. Hypodontia had a prevalence of 2% in girls and 3.76% in boys (p=0.007), and oligodontia of 0.33% in girls and 0.38% in boys (p=0.367). Unique abnormalities were registered at 1% in girls and 1.5% in boys (p=0.026), those with two associations at 0.67% in girls and 1.5% in boys (p=0.015), and those with triple association at 0.67% in girls and 1.13% in boys (p=0.037). Hypodontia∕oligodontia has been identified in association with other dental abnormalities, such as inclusion, microdontia, and enamel hypomineralization. The most frequent was the association of hypodontia with enamel hypomineralization.