Abstract
The objective of the research was to determine the effectiveness of obturation of the root canals and crown part of the teeth, and to identify the most important factors influencing its results, based on the X-ray examination.
 Materials and methods: The study was conducted at the Dental Center (University Clinic, Ivano-Frankivsk National Medical University). Evaluation of 140 orthopantomograms, computed tomograms and digital intraoral images of patient, aged 18-68 years with endodontically treated teeth, was made with the aim to determine the obturation state of root canals and the state of periodontal tissues. The radiological picture of 579 teeth and 1120 roots in particular was evaluated.
 Results: the state of apical constriction, the state of obturation of root canals, sealing conditions of coronal part of the tooth, the state of periodontal tissues were analyzed, compared and discussed.
 Conclusions: According to the results obtained in this study, the relationships between the presence of periapical changes and state of apical constructions, obturation level of filling material in roots canals, coronal leakage, and periodontal tissue changes were found.
 Keywords: periapical changes, endodontic treatment, coronal leakage, x-ray examination
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