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Purpose The aims of this study were first, to compare panoramic radiography with cone-beam computed tomography (CBCT) for evaluating topographic relationships, such as the classification of maxillary posterior teeth and their distance to the maxillary sinus floor; and second, to determine the relationship between maxillary sinus pathology and the presence of apical lesions. Materials and Methods In total, 285 paired CBCT and panoramic radiography records of patients (570 maxillary sinuses) were retrospectively analyzed. Both imaging modalities were used to determine the topographic relationship of the maxillary posterior teeth to the sinus floor. Mucosal thickening >2 mm was considered a pathological state. Data were analyzed using the chi-square, Wilcoxon, and Mann-Whitney U tests. Odds ratios (ORs) and confidence intervals (CIs) were calculated. Results The closest vertical distance measurements made between posterior maxillary teeth roots and the maxillary sinus on panoramic radiography and CBCT scans showed statistically significant differences from each other ( P <0.05). Compared to panoramic radiography, CBCT showed higher mean values for the distance between the maxillary sinus floor and maxillary posterior teeth roots. The CBCT images showed that at least 1 apical lesion adjacent to the right maxillary sinus increased the risk of maxillary sinus pathology by 2.37 times (OR, 2.37; 95% CI, 1.58-3.55, P <0.05). Conclusion Panoramic radiography might lead to unreliable diagnoses when evaluating the distance between the sinus floor and posterior roots of the maxillary teeth. Periapical lesions anatomically associated with maxillary sinuses were a risk factor for sinus mucosal thickening.

SUMMARY Aim:To determine the distribution and frequency of endodontic treatment and endodontic treatment requirement in permanent teeth. Materials and Methods: Of the 19800 teeth from 775 individuals (age range 16-80 years) were included in the study. All patients were examined clinically and radiologically to determine the teeth requiring endodontic treatment and endodontically treated teeth. For each case, information was collected in a questionnaire including age, gender, education, residence place, income level, frequency of tooth brushing and dental visit. Obtained data were statistically analyzed by using chi-square test with a significance level at p<0,05. Results: Out of 19800 teeth, the frequency of teeth requiring endodontic treatment and endodontically treated teeth was 3% and 4%, respectively. Presence of endodontic treatment showed statistical difference between age subgroups (p<0.05). Gender, frequency of tooth brushing and dental visit had effect on the endodontic treatment requirement (p<0.05). Conclusion:This study provides an epidemiological data about endodontic treatment in a Turkish population. Such datas will help to identify public dental health problems which will constitute an essential step in improving the general health status of the citizens of this country.