Zhongpu Zhang1, Tanapon Sornsuwan2, Chaiy Rungsiyakull3, Wei Li4, Qing Li5, Michael V Swain6. 1. School of Aerospace, Mechanical and Mechatronic Engineering, Faculty of Engineering, The University of Sydney, NSW 2006, Australia. Electronic address: leo.zhang@sydney.edu.au. 2. Department of Restorative Dentistry, Faculty of Dentistry, Naresuan University, Phitsanulok, Thailand. Electronic address: tsor7523@uni.sydney.edu.au. 3. Department of Mechanical Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai, Thailand. Electronic address: chaiy@eng.cmu.ac.th. 4. School of Aerospace, Mechanical and Mechatronic Engineering, Faculty of Engineering, The University of Sydney, NSW 2006, Australia. Electronic address: wei.li@sydney.edu.au. 5. School of Aerospace, Mechanical and Mechatronic Engineering, Faculty of Engineering, The University of Sydney, NSW 2006, Australia. Electronic address: qing.li@sydney.edu.au. 6. Disciplines of Biomaterials, Faculty of Dentistry, The University of Sydney, NSW 2010, Australia. Electronic address: mswain@mail.usyd.edu.au.
Abstract
OBJECTIVE: This study aimed to individually quantify the effects of various design parameters, including margin thickness, convergence angle of abutment, and bonding conditions on fracture resistance of resin bonded glass dental crown systems (namely, glass simulated crown). MATERIALS AND METHODS: An in vitro experimental test and an in silico computational eXtended Finite Element Method (XFEM) were adopted to explore crack initiation and propagation in glass simulated crown models with the margin thickness ranging from 0.8 to 1.2mm, convergence angle from 6° to 12°, and three different bonding conditions, namely non-bonded (NB), partially bonded (PB), fully bonded (FB). RESULTS: The XFEM modeling results of cracking initiation loads and subsequent growth in the glass simulated crown models were correlated with the experimental results. It was found that the margin thickness has a more significant effect on the fracture resistance than the convergence angle. The adhesively bonded state has the highest fracture resistance among these three different bonding conditions. CONCLUSION: Crowns with thicker margins, smaller convergence angle and fully bonded are recommended for increasing fracture resistance of all-ceramic crowns. This numerical modeling study, supported by the experimental tests, provides more thorough mechanical insight into the role of margin design parameters, thereby forming a novel basis for clinical guidance as to preparation of tapered abutments for all-ceramic dental crowns.
OBJECTIVE: This study aimed to individually quantify the effects of various design parameters, including margin thickness, convergence angle of abutment, and bonding conditions on fracture resistance of resin bonded glass dental crown systems (namely, glass simulated crown). MATERIALS AND METHODS: An in vitro experimental test and an in silico computational eXtended Finite Element Method (XFEM) were adopted to explore crack initiation and propagation in glass simulated crown models with the margin thickness ranging from 0.8 to 1.2mm, convergence angle from 6° to 12°, and three different bonding conditions, namely non-bonded (NB), partially bonded (PB), fully bonded (FB). RESULTS: The XFEM modeling results of cracking initiation loads and subsequent growth in the glass simulated crown models were correlated with the experimental results. It was found that the margin thickness has a more significant effect on the fracture resistance than the convergence angle. The adhesively bonded state has the highest fracture resistance among these three different bonding conditions. CONCLUSION: Crowns with thicker margins, smaller convergence angle and fully bonded are recommended for increasing fracture resistance of all-ceramic crowns. This numerical modeling study, supported by the experimental tests, provides more thorough mechanical insight into the role of margin design parameters, thereby forming a novel basis for clinical guidance as to preparation of tapered abutments for all-ceramic dental crowns.
Authors: Ali Entezari; Seyed-Iman Roohani-Esfahani; Zhongpu Zhang; Hala Zreiqat; Colin R Dunstan; Qing Li Journal: Sci Rep Date: 2016-07-12 Impact factor: 4.379
Authors: Alexandre Luiz Souto Borges; João Paulo Mendes Tribst; Aline Lins de Lima; Amanda Maria de Oliveira Dal Piva; Mutlu Özcan Journal: Clin Exp Dent Res Date: 2021-07-09