Maxillary lateral incisors (35.6%) and maxillary second premolars (13.0%) were the most commonly missing teeth, followed by mandibular lateral incisors (9.6%) and mandibular second premolars (8.2%). Hypodontia was more common in patients with Class III malocclusion (45.2%), and was more prevalent in the maxilla (71%) than in the mandible (29%). A total of 197 congenitally missing teeth were observed in 160 patients (9.1% 74 boys and 86 girls) there were no statistically significant differences between sexes (Chi-square = 0.832, P = 0.36). The Chi-square test was used to analyze differences in the distribution of hypodontia, after stratification by sex and malocclusion type. A retrospective study was conducted using periapical and panoramic radiographs and study models of 1,751 subjects attending university orthodontic clinics (870 females, 881 males, age 9-27 years). To investigate the prevalence, characteristics (ie, malocclusion, location, type), and sex distribution of hypodontia in an Iranian orthodontic population.
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