Survey of the prevalence of dental agenesias in patients between 7 and 16 years old

Objective: To assess the prevalence of dental agenesias in patients between the ages of 7 and 16 years, in the city of Campo Grande, Mato Grosso do Sul, from the analysis of panoramic radiographs from 2005 to 2007. Methods: A single operator analyzed 1,500 panoramic radiographs of patients, 750 being men and 750 women. Results: The data of the samples were statistically analyzed by the Chi-square and Student’s-t tests, and ANOVA with a level of significance of 5%, and the presence of agenesias was found in 40.6% of the patients. It was demonstrated that gender had no influence of gender on the occurrence of dental agenesia. The tooth that had a highest frequency of this type of anomaly was the third molar, followed by the second premolar (particularly the mandibular teeth), maxillary lateral incisor and maxillary first pre-molar. Although there was no statistically significant difference in comparison with other quadrants, the most frequent localization occurred in the mandible, in the mandibular right quadrant. Conclusion: A high prevalence of agenesias was found, with no statistically significant difference with regard to gender. There were no statistically significant differences between the means of agenesias with regard to the teeth. Whereas, no differences in the presence of the anomaly were found as regards location.