Prevalence and Location of Supernumerary Teeth in Different Classes of Malocclusion among an Orthodontic Patient Population

Hyperdontia or supernumerary teeth might be associated with disorders in teeth, occlusion and esthetics. This study was undertaken to investigate the prevalence and position of supernumerary teeth in different types of malocclusion among orthodontic patients. In this retrospective descriptive study, 102 patients (males and females) with hyperdontia who were referred to a private clinic for conventional dental examination, counseling or performing orthodontic treatment from 2008 to 2016, were identified. The supernumerary teeth were recorded in terms of presence, number, shape and location (maxilla or mandible) using panoramic radiographs. Malocclusion type of the patients was also classified into types I, II and III and recorded. Data were analyzed with SPSS 20, using chi-squared test (α = 0.05). The prevalence of supernumerary teeth in males was significantly higher than that in females (p value = 0.036). Maxilla had a higher incidence of supernumerary teeth than mandible (p value < 0.001). The prevalence of supernumerary teeth was not significantly different between different classes of malocclusion (I, II and III). Crowding (22.5%), impaction (21.6%) and malposition adjacent to supernumerary teeth (5.9%) were the most frequent abnormalities associated with supernumerary teeth. The results of the present study are generally consistent with those reported in the literature. However, there are a few differences that might be due to racial and environmental differences. The prevalence of supernumerary teeth in our patients was low, and it was more prevalent in males and in the mandible. In addition, it was not related to the type of occlusion of the patients