•Purpose: to evaluate the association between coronal restoration integrity and presence of periapical bone lesions in root-filled teeth several years after root canal therapy.
•N= 55 patients with root fillings that had been exposed to oral environment because of caries or absent restorations.
-All patients at follow-up with teeth that showed either deep caries / missing restoration (Open group) or teeth with intact coronal restorations (intact group) were compared in regard to endodontic therapy, tooth type, age of the patient, and the technical quality of the root filling.
-RCT was done using lateral condensation tech. üPatients with a follow-up period of more than 3 years
-Radiographic periapical status of both “open” and “intact” groups were subjected to masked evaluators.
Most highlighted Results:
1.Follow-up period: mean of 7 years in both groups. 95% considered adequately filled.
2.The follow-up radiographs of 43 patients presented with a total of 14 periapical lesions (78%): 10 in “open gp”& 4 in “intact gp”.
3.The odds ratio for a lesion to be associated with an “open” tooth was =3.0 (P value >.1) indicating a non-statistically significant tendency for “open” teeth to be associated with periapical lesions in comparison to “intact” teeth.
Data suggest that the problem of coronal leakage may not be of such a great Clinical importance as implicated by numerous studies in vitro, provided instrumentation and root fillings are carefully performed.