The Effect of Access Cavity Designs and Sizes of Root Canal Preparations on the Biomechanical Behavior of an Endodontically Treated Mandibular First Molar: A Finite Element Analysis |
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| Affiliation: | 1. Department of Endodontics, The British University, Cairo, Egypt;2. Department of Endodontics, Ain Shams University, Cairo, Egypt;3. Department of Conservative Dentistry, Pusan National University School of Dentistry, Dental Research Institute, Yangsan, Korea;1. Faculty of Dentistry, Department of Oral Biological and Medical Sciences, The University of British Columbia, Vancouver, Bitish Columbia, Canada;2. Department of Conservative Dentistry and Endodontics, Guanghua School of Stomatology, Guangdong Province Key Laboratory of Stomatology, Sun Yat-Sen University, Guangzhou, Guangdong Province, China;3. Department of Materials Engineering, The University of British Columbia, Vancouver, Bitish Columbia, Canada;1. Department of Oral and Maxillo-Facial Sciences, University of Rome, Sapienza, Italy;2. Dental Department, King Abdulaziz Medical City, Jeddaah, Saudi Arabia;3. Department of Therapeutic Dentistry, I.M. Sechenov First Moscow State Medical University, Moscow, Russia;1. MSc Endodontics Program, University of Toronto, Toronto, Ontario, Canada;3. Discipline of Endodontics and Dental Research Institute, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada;4. Discipline of Prosthodontics, University of Toronto, Toronto, Ontario, Canada;2. Division of Endodontics, School of Dental Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania;1. Department of Dentistry, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil;2. Department of Endodontics, Fluminense Federal University, Niterói, Rio de Janeiro, Brazil;3. Department of Endodontics, School of Dentistry, Grande Rio University, Duque de Caxias, Rio de Janeiro, Brazil;4. Department of Endodontics, Rio de Janeiro State University, Rio de Janeiro, Rio de Janeiro, Brazil;1. Department of Endodontics, Faculty of Dental Medicine, Al-Azhar University, Cairo, Egypt;2. Department of Conservative Dentistry, School of Dentistry, Pusan National University, Busan, South Korea |
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| Abstract: | IntroductionThis study aimed to compare the biomechanical properties of a mandibular first molar with different endodontic cavity designs and increasing sizes of root canal preparations using finite element analysis (FEA).MethodsThe experimental finite element models were designed with 3 different endodontic access cavities and 2 sizes of canal preparations: traditional access cavity, conservative access cavity, and truss access cavity and #30/.04 and #40/.04 of root canal preparations. Vertical and oblique loads were applied with a 250-N static force to simulate masticatory forces. Mathematical analysis was performed to evaluate the stress distribution patterns. Maximum von Mises (VM) stresses were assessed at the occlusal surface; cervical line; and 1 , 3, 5, and 7 mm from the root apices.ResultsDecreasing the size of the access cavity was associated with a higher magnitude of cervical stresses. The magnitude of VM stresses was maximum at the 7-mm level and was minimum at the 1-mm level from the root apex. Increasing the size of the access cavity was associated with the transmission of stresses to a further apical direction regardless of the extent of root canal enlargement. The root canal enlargement from #30 to #40 increased radicular VM stresses within all models.ConclusionsWithin the limitations of this study, conservative and truss access designs preserved a significant volume of tooth structure. The extent of root canal enlargement should be as small as practical without jeopardizing the biologic objectives of root canal treatment. |
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| Keywords: | Access cavity conservative access contracted access custom access finite element analysis occlusal loads truss access |
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