Optimum Shaping Parameters of the Middle Mesial Canal in Mandibular First Molars: A Finite Element Analysis Study |
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| Institution: | 1. Department of Endodontics, Faculty of Dentistry, The British University in Egypt, Cairo, Egypt;2. School of Dentistry, University of Western Australia, Perth, Western Australia, Australia;3. Department of Endodontics, Sydney Dental School, University of Sydney, Sydney, Australia;4. Department of Endodontics, Ain Shams University, Cairo, Egypt;5. Department of Conservative Dentistry, Pusan National University School of Dentistry, Dental Research Institute, Dental and Life Science Institute, Yangsan, Korea;1. Department of Endodontics, The University of Texas Health Science Center at Houston School of Dentistry, Houston, Texas;2. Department of Restorative Dentistry and Prosthodontics, The University of Texas Health Science Center at Houston School of Dentistry, Houston, Texas;1. Department of Endodontics, 11th floor, Tufts University School of Dental Medicine, Boston, Massachusetts;2. Department of Public Health and Community Service and Director of Biostatistics and Experimental Design, Boston, Massachusetts;3. Department of Endodontics, 11th floor, Tufts University School of Dental Medicine, Boston, Massachusetts;4. Boston Children''s Hospital/Harvard School of Dental Medicine, Boston, Massachusetts;5. Martin Endodontics, Beverly Hills, California;6. Department of Endodontics, 11th floor, Tufts University School of Dental Medicine, Boston, Massachusetts;1. Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada;2. Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran;3. School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran;4. Centre for Advanced Dental Research and Care, Mount Sinai Hospital, Toronto, Ontario, Canada;6. Department of Oral and Maxillofacial Radiology, North Khorasan University of Medical Sciences, Bojnurd, Iran;5. Institute of Health Policy, Management and Evaluation, Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada;1. Department of Periodontology, Medical University of Warsaw, Warsaw, Poland;2. Private Orthodontic Practice, Warsaw, Poland;3. Department of Orthodontics, Medical University of Warsaw, Warsaw, Poland;4. Department of Molecular Biology and Genetics, Medical University of Silesia, Katowice, Poland;6. Orthodontic and Dental Private Practice, Zabrze, Poland;5. Faculty of Humanities, University of Silesia, Katowice, Poland |
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| Abstract: | IntroductionThis study investigated the effect of shaping parameters of 2 different configurations of middle mesial canals (MMCs) on the biomechanical behavior and life span of a mandibular first molar using finite element analysis (FEA).MethodsA mandibular molar with an independent MMC and another with a confluent MMC were scanned via micro-computed tomography, and FEA models were produced. For each tooth, an intact model and 5 experimental models were produced that differed by parameters of how the MMC was shaped: unshaped MMC, 25/.04, 25/.06, 30/.04, and 30/.06. Cyclic loading of 50 N was applied on the occlusal surface in vertical and oblique scenarios, and the number of cycles until failure (NCF) was compared with the intact models. In addition, mathematical analyses evaluated the stress distribution patterns and calculated maximum von Mises and maximum principal stresses.ResultsFor both the independent and confluent MMC models, shaping the MMC reduced the NCF. The lifelog percentage of models was inversely proportional with radicular shaping parameters during the vertical and oblique loading scenarios. The shaping size of 30/.06 resulted in lower lifelog percentage than the cases with shaping size of 25/.04 in both of the independent and confluent MMC models. For all models, oblique loading reduced NCF more than vertical loading.ConclusionShaping the MMC should be kept as conservative as 25/.04. Also, whether the MMC is independent or confluent is a deciding factor in whether to increase the apical diameter or the root canal taper when larger shaping parameters are needed. |
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| Keywords: | Canal shaping cyclic fatigue finite element analysis fracture resistance lower molar middle mesial canal tooth life span |
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