Success and failure of nonsurgical root canal treatment performed by dental students of Naresuan University

Abstract

Background/Objective: The purposes of this research were to determine the success and failure rate of root canal treatment and also determine factors affecting the success and failure of root canal treatment performed by undergraduate students at the Faculty of Dentistry, Naresuan University from May 2015 to April 2020.

Materials and methods: Data of 176 anterior teeth and premolars from dental treatment records and radiographs were collected and evaluated. Digital periapical radiographs were evaluated by the Periapical index (PAI) score system. The treatment outcome was assessed based on the clinical and radiographic findings. Factors affecting the outcome were analyzed using the Chi-square test and logistic regression model.

Results: The recall rate was 32.8%. The overall success rate was 84.1%, whereas the failure rate was 15.9%. The multivariate analysis identified that factors affecting outcome were the presence of pre-operative periapical lesion size < 5 mm (P=.025), periapical lesion size ≥ 5 mm (P=.005), and the occurrence of occlusal trauma (P=.040), with odds ratios of 0.18, 0.13, and 0.09, respectively.

Conclusions: The teeth without periapical lesions had a better success rate than those with lesions. The occlusal trauma is an important factor in prolonging periapical healing of root canal treated teeth.

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