Weishi Yan1, Carolina Montoya2, Marit Øilo3, Alex Ossa2, Avina Paranjpe4, Hai Zhang5, Dwayne D Arola6. 1. Department of Materials Science and Engineering, University of Washington, Seattle, Washington. 2. School of Engineering, Universidad EAFIT, Medellín, Colombia. 3. Department of Materials Science and Engineering, University of Washington, Seattle, Washington; Department of Clinical Dentistry, Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway. 4. Department of Endodontics, University of Washington, Seattle, Washington. 5. Department of Restorative Dentistry, University of Washington, Seattle, Washington. 6. Department of Materials Science and Engineering, University of Washington, Seattle, Washington; Department of Restorative Dentistry, University of Washington, Seattle, Washington; Department of Oral Health Science, School of Dentistry, University of Washington, Seattle, Washington. Electronic address: darola@u.washington.edu.
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 < .05) than tissue from age- and donor-matched unrestored tooth pairs. Although there was no significant difference in the mineral-to-collagen ratio between the 2 groups, dentin obtained from the root canal-treated teeth exhibited more extensive collagen cross-linking and lower tubule occlusion ratios than the unrestored tooth pairs. CONCLUSIONS: There is a decrease in the strength of radicular dentin with aging, but prior root canal treatment increases the extent of degradation.
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 < .05) than tissue from age- and donor-matched unrestored tooth pairs. Although there was no significant difference in the mineral-to-collagen ratio between the 2 groups, dentin obtained from the root canal-treated teeth exhibited more extensive collagen cross-linking and lower tubule occlusion ratios than the unrestored tooth pairs. CONCLUSIONS: There is a decrease in the strength of radicular dentin with aging, but prior root canal treatment increases the extent of degradation.
Authors: Paula Barcellos da Silva; Simone Ferreti Duarte; Murilo Priori Alcalde; Marco Antonio Húngaro Duarte; Rodrigo Ricci Vivan; Ricardo Abreu da Rosa; Marcus Vinícius Reis Só; Angela Longo do Nascimento Journal: BMC Oral Health Date: 2020-04-16 Impact factor: 2.757