Radiographic Study of the Prevalence and Pattern of Impacted Mandibular Third Molars in a Northern Nigerian Population.

Background: The incidence of impacted mandibular and maxillary third molars has become a global public health concern. This study reports a radiographic prevalence and pattern of impacted mandibular third molars among a Nigerian population. Objectives: The aim of this study was to determine the prevalence and pattern of impacted mandibular third molars in a Northern Nigeria population. Materials and Methods: This retrospective cross-sectional study was conducted at the Oral Diagnostic Sciences Department of the Aminu Kano Teaching Hospital Kano, Kano State, Nigeria. Digital diagnostic images of patients of record on Planmeca Promax® within the sampling frame and acquired during the two years under review, were included in the study. The images were analyzed on Planmeca Romexis 4.3.0 R software to identify relevant study variables. Descriptive statistics was done using SPSS for windows software version 23.0 (IBM, Chicago IL., USA). Also, Pearson’s Chi‑square (χ2) statistical test was applied while confidence interval and P-value were set at 95% and ≤0.05, respectively. Results: A total of 4,932 pantomographs were reviewed and 576 were selected for the study. There were 824 impacted mandibular third molars within the age range of 18-65 years (mean age±SD = 32.67±9.69). 297 (51.6%) were males, and 279 (48.4%) were females. The prevalence of impacted mandibular third molar was 16.71%. Impacted mandibular third molar occurred more frequently in the 26-35 years age range. The most frequent angle of impaction was horizontal, followed by mesioangular, and the least frequent angulation was distoangular. Conclusion: The prevalence and pattern of impacted third molars among Northern Nigeria population are almost similar to other racial populations with minor variations, and the prevalence decreases with increasing age. A proper radiographic evaluation of the patterns of third molars impaction is, therefore, essential to assist dental surgeons in making decisions with regard to surgical planning and treatment. Key Words: Impacted teeth, panoramic radiograph, third molar.