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Frequency of external root resorption in mandibular second molars associated with mandibular impacted third molars in a sample of Egyptian population using CBCT: A cross-sectional study

Aim: To investigate the prevalence and risk factors of external root resorption (ERR) in mandibularsecond molars adjacent to impacted third molars in a sample of Egyptian population. Methodology: CBCTscans involving 255 mandibular impacted third molars were included. Demographic factors (age and gender) and Radiographic factors(impaction angulation and impaction depth) were assessed. The presence of ERR and distal caries in mandibular second molarand their association with the demographic and radiographic data was analyzed. Statistical analysis was performed using IBM SPSS Statistics Version 2.0 for Windows. Results: The prevalence of ERR was 18.4% in mandibular second molars with higher occurrences in horizontal and mesioangular third molars classified as class B and C (P= 0.001, P=0.017). Besides, class C impaction increased the risk of ERR severity in second molars (P < 0.05). The prevalence of caries was 14.5%, with increased caries severity with class A impaction (P< 0.001). Conclusions: ERR and distal caries occurring in mandibular second molars adjacent to impacted third molarsshould not be neglected. ERR should be suspected with horizontal and mesioangular third molars classified as class B and C impaction depth.