Scientific Study Compares the Accuracy of Techniques for Detecting Filling Material Residues After Root Canal Retreatment

As part of ongoing research efforts aimed at improving endodontic treatment methods and enhancing diagnostic efficiency, a recent laboratory study compared the accuracy of several techniques used to detect residual root canal filling materials after retreatment, in order to determine the most reliable method for evaluating treatment success.

The study was conducted by a joint research team from the Private International University for Science and Technology, Damascus University, the University of Manitoba (Canada), and Al-Qalamoun Private University. It was published in the Dentistry Journal by MDPI and is indexed in PubMed, PMC, and Google Scholar (Q1 journal).

The study included 15 extracted human lower premolars with single root canals. The canals were prepared and filled using gutta-percha with a calcium silicate–based bioceramic sealer, and then retreated using specialized files to remove the filling material.

The researchers employed three different techniques to evaluate residual filling materials: cone-beam computed tomography (CBCT), micro-computed tomography (Micro-CT), and digital microscopy (DGM). Micro-CT was used as the reference standard due to its high accuracy in volumetric measurements.

The results showed that CBCT tends to overestimate the amount of residual material within the root canal compared to Micro-CT, while digital microscopy underestimated the remaining material due to its limitation to surface evaluation after root splitting.

The study confirmed that Micro-CT is the most reliable technique for assessing residual root canal filling materials after retreatment. It also emphasized that CBCT findings should be interpreted with caution to avoid unnecessary clinical decisions, and highlighted the importance of considering the limitations of each technique in future research design and clinical evaluation.

These findings contribute to a better understanding of the accuracy of modern diagnostic tools in dentistry, supporting the development of more effective treatment protocols and improving the quality of patient care.