Biomechanical simulation of segmented intrusion of a mandibular canine using Robot Orthodontic Measurement & Simulation System (ROSS).
Autor: | Sabbagh H; LMU University Hospital, Department of Orthodontics and Dentofacial Orthopedics, Goethesstrasse 70, Munich, Germany. Electronic address: hisham.sabbagh@med.uni-muenchen.de., Dotzer B; LMU University Hospital, Department of Orthodontics and Dentofacial Orthopedics, Goethesstrasse 70, Munich, Germany., Baumert U; LMU University Hospital, Department of Orthodontics and Dentofacial Orthopedics, Goethesstrasse 70, Munich, Germany., Hötzel L; LMU University Hospital, Department of Orthodontics and Dentofacial Orthopedics, Goethesstrasse 70, Munich, Germany., Seidel CL; LMU University Hospital, Department of Orthodontics and Dentofacial Orthopedics, Goethesstrasse 70, Munich, Germany., Wichelhaus A; LMU University Hospital, Department of Orthodontics and Dentofacial Orthopedics, Goethesstrasse 70, Munich, Germany. |
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Jazyk: | angličtina |
Zdroj: | Journal of the mechanical behavior of biomedical materials [J Mech Behav Biomed Mater] 2024 Dec; Vol. 160, pp. 106720. Date of Electronic Publication: 2024 Sep 06. |
DOI: | 10.1016/j.jmbbm.2024.106720 |
Abstrakt: | Objective: Aim of this study was to investigate the forces and moments during segmented intrusion of a mandibular canine using Cantilever-Intrusion-Springs (CIS). Methods: Three different CIS modifications were investigated using a robotic biomechanical simulation system: unmodified CIS (#1, control), CIS with a lingual directed 6° toe-in bend (#2), and CIS with an additional 20° twist bend (#3). Tooth movement was simulated by the apparative robotic stand, controlled by a force-control algorithm, recording the acting forces and moments with a force-torque sensor. Statistical analysis was performed using Shapiro-Wilk, Kolmogorov-Smirnov, Kruskal-Wallis ANOVA and post hoc tests with Bonferroni correction (α = 0.05). Results: The initial intrusive force, which was uniformly generated by a 35° Tip-Back bend, decreased significantly (p < 0.05) from 0.31 N in group (#1) to 0.28 N in group (#3). Vestibular crown tipping reduced significantly (p < 0.05) from 2.11° in group (#1) and 1.72° in group (#2) to 0.05° in group (#3). Matching to that the direction of orovestibular force significantly (p < 0.05) shifted from 0.15 N to vestibular in group (#1) to 0.51 N to oral in group (#3) and the orovestibular tipping moment decreased also significantly (p < 0.05) from 4.63 Nmm to vestibular in group (#1) to 3.56 Nmm in group (#2) and reversed to 1.20 Nmm to oral in group (#3). Apart from that the orovestibular displacement changed significantly (p < 0.05) from 0.66 mm in buccal direction in group (#1) to 0.29 mm orally in group (#2) and 1.49 mm in oral direction as well in group (#3). Significance: None of the modifications studied achieved pure mandibular canine intrusion without collateral effects. The significant lingual displacement caused by modification (#3) is, not least from an aesthetic perspective, considered much more severe than a slight tipping of the canine. Consequently, modification (#2) can be recommended for clinical application based on the biomechanical findings. Competing Interests: Declaration of competing interest Have no conflict of interest to disclose. (Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.) |
Databáze: | MEDLINE |
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