A study on prevalence of Hypodontia in 15 year old students in Ahwaz 2002

The purpose of this study was to determine the prevalence of hypodontia in 15 year old students (boys & girls) in AHWAZ on 2002. Method & Materials: This study was a descriptive Cross Sectional investigation with randomized cluster sampling on 866 Students (15 years old). Data collection is done with radiography, questionnaire and clinical examination. The radiographical prevalence of hypodontia (excluded third molars) was %4 that in females (%4.8) was more than males (%3.4), that isn’t significant (p=0.3). The order of frequency of congenital missing is: 1. Maxillary lateral incisors (%35.8). 2. Mandibular second premolar (%28.4). 3. Mandibular central incisor (%8.9). The congenital missing teeth on maxilla are more common. Hypodontia is more common on girls and maxilla. The order of congenital missing is: 1. maxillary lateral incisor, 2. mandibular second premolar and 3. mandibular central incisor.