This study assessed the influence of root canal treatment quality on the architecture of periapical lesions. A total of 121 lesions were involved in this research. Two researchers analysed the surface of the lesions, diameters in three planes, volume and sphericity. The quality of root canal treatment was assessed with PESS index. Non-parametric statistical tests: Mann-Whitney and Spearman rank correlation coefficient were used in this research. Connected lesions of multirooted teeth spread in the coronal plane revealed a positive correlation with coronal seal and root canal filling homogenicity, however their spread in the sagittal plane showed a positive correlation only with root canal filling homogenicity. The quality of root canal treatment has an influence on the periapical lesions' architecture.
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