Stresses in Teeth with External Cervical Resorption Defects Restored with Different Biomimetic Cements: A Finite Element Analysis |
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| Affiliation: | 1. Division of Endodontics, Department of Restorative Dentistry and Biomaterials Sciences, Harvard School of Dental Medicine, Boston, Massachusetts;2. Department of Endodontics, New York University College of Dentistry, New York, New York;1. Microscope Center, Department of Conservative Dentistry and Oral Science Research Center, Yonsei University College of Dentistry, Seoul, Korea;2. Division of Anatomy and Developmental Biology, Department of Oral biology, BK21 FOUR Project, Yonsei University College of Dentistry, Seoul, Korea;1. Department of Endodontics, Tufts University School of Dental Medicine, Boston, Massachusetts;2. Department of Public Health and Community Service, Tufts University School of Dental Medicine, Boston, Massachusetts;1. Department of Restorative Dentistry, Rutgers School of Dental Medicine, Newark, New Jersey;2. Department of Endodontics, University of the Pacific, Arthur A. Dugoni School of Dentistry, San Francisco, California;3. Sector of Innovation in Dentistry, Dr. Hajar Afsar Lajevardi Research Cluster (DHAL), Hackensack, New Jersey;4. Biomaterial and Prosthodontics Laboratory, Rutgers School of Dental Medicine, Newark, New Jersey;5. Department of Molecular and Cellular Biology, Johns Hopkins University, Baltimore, Maryland |
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| Abstract: | IntroductionThis study compared the stress distributions in teeth with simulated external cervical resorption defects restored with different restorative materials and identified areas of high stress concentration.MethodsA maxillary central incisor created in a scanned model using HyperWorks software (Altair Engineering Inc, Troy, MI) served as the control. External cervical resorption defects based on Shanon Patel’s classification were created (1Bd/2Bd/3Bd) in the scanned model. The defects were restored using mineral trioxide aggregate, Biodentine, glass ionomer cement, and Bioaggregate. On all the models, a force of 100 N was applied on the palatal aspect 2 mm incisal to the cingulum directed at 45° along the long axis of the tooth.ResultsThe stresses generated in dentin and cementum are less, with a restorative material having a high Young’s modulus. For the 1Bd defect, MTA and Bioaggregate showed least stresses in dentin and cementum, respectively, whereas Biodentine had consistently lower stresses in dentin and cementum. Larger defects like 2Bd and 3Bd restored with Bioaggregate exhibited minimum stresses in dentin and cementum.ConclusionsBioaggregate and Biodentine replace dentin with maximum stress and maximum strain. Elastic moduli similar to or higher than dentin are preferred for restoring cervical third resorptive lesions of the tooth. |
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| Keywords: | Bioaggregate Biodentine external cervical resorption finite element analysis maxillary central incisor stress analysis |
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