Contribution of Root Canal Treatment to the Fracture Resistance of Dentin

Abstract Introduction Although the strength and toughness of dentin decrease with age, no study has explored if restorative treatments are a contributing factor. Methods Multiple extracted teeth were obtained from randomly selected donors and categorized according to donor age and prior root canal treatment. The microstructure and chemical composition of radicular dentin were evaluated using scanning electron microscopy and Raman spectroscopy, respectively, and the strength was evaluated in 4-point flexure to failure. Data were compared using the Student t test. Results Dentin from the root canal–restored teeth exhibited significantly lower strength ( P Conclusions There is a decrease in the strength of radicular dentin with aging, but prior root canal treatment increases the extent of degradation.