RÉSUMÉ
The aim of this study was to determine the prevalence of apical periodontitis and the technical quality of root canal fillings in a Palestinian sub-population. The panoramic radiographs of 258 patients [142 females, 116 males] attending dental clinics in 2010 were examined to identify the presence of apical lesions associated with any remaining teeth, excluding third molars. The technical quality of root canal fillings was also evaluated by assessing apical extension from the radiographic apex. The panoramic radiographs were taken by a well-trained radiology assistant and evaluated by a radiologist and an endodontist. Statistical analysis was performed with the chi-square test with a significant level set at P < 0.05%. Of 6482 teeth examined radiographically, 978 [15.1%] had radiographic signs of apical periodontitis [AP]. The prevalence of AP was 8.3% in teeth without filled roots and 59.5% [509/ 855] in root canal-treated teeth. The prevalence of AP and endodontic treatment increased with age and differed significantly [p < 0.05] between males and females. The majority [74.5%] of root canal fillings was performed inadequately, and most [77.2%] inadequate fillings were > 2 mm short of the radiographic apex. The presence of AP was correlated significantly with poorly executed root canal fillings [p < 0.05]. The present study found a high prevalence and incidence of AP in association with root-filled teeth. The technical quality of many root canal treatments was unacceptable