Objective: The purpose of this study was to compare the quality of coronary restorations and root canal fillings with the periapical status of root-filled teeth, in a subpopulation of Turkish individuals. Method: The study included 18,210 randomly selected, 20- to 70-year-old patients referred to the Dental Faculty of Ondokuz Mayis University. A total number of 1,027 root-filled teeth from 780 patients (645 females, 382 males) matched these criteria. Additionally, the radiographs were separated

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... according to the age and gender of patients. Panoramic radiographies compared the quality of coronary restorations and root canal fillings with the periapical status of root-filled teeth. Results: The most numerous root-filled teeth were observed in the 20- to 29-year-old group, in both genders. For the maxillary and mandibular incisive teeth, the prevalence of inadequate coronary restoration with apical periodontitis (AP) is 29.04% in males and 70.96%, respectively, in females (p<0.05). For the posterior teeth, in both jaws, the prevalence of inadequate coronary restoration with AP is 38.99% in males and 61.02%, respectively, in females. The AP prevalence in inadequate coronary restorations was significantly higher for the posterior than for the anterior teeth. Conclusion: This study concludes that adequate coronary restorations and crowned root-filled teeth significantly reduce AP incidence.