Evaluation the relationship between hypodontia and asymmetry of permanent tooth formation using panoramic radiographs

Hypodontia is a dental anomaly which indicates the maternal missing of less than 6 teeth in the dentition. This anomaly is affected by the genetics and environmental factors. The purpose of this study was to evaluate the asymmetric developing of left and right sides permanent teeth in children with hypodontia. This can be useful for comprehensive treatment in these patients.

In this cross-sectional study, the samples were taken from the patients of the dentistry department of Ardabil in years 97-98. The 3 intrusion criteria were: 1- The patients aged 5-14 years who needed OPG for continuing their treatments. 2- No history of medical disease, craniofacial syndromes and clefts in orofacial area. 3- No history of orthodontic treatment. The 12 description levels of Haavikko were used to determine the amounts of permanent teeth development. The bilateral asymmetry of each tooth in children with hypodontia and normal children were compared in the same age. The fischer test and the logistic regression were used to analyze the data with the level of significant p<0/05.

From the 1604 number of OPG radiographs, 162 had hypodontia. According to this, the prevalence of hypodontia in the population is 10.16%. The most prevalent missed teeth are the mandibular second premolars, and maxillary lateral incisors. The results showed that the ratio of asymmetry in patients with hypodontia is 11.54.

The possibility of asymmetric developing of teeth in children with hypodontia is more than the normal children.