Finite element analysis of the convergence of the centers of resistance and rotation in extreme moment-to-force ratios

Geramy, Allahyar; Tanne, Kazuo; Moradi, Meisam; Golshahi, Hamid; Jalali, Yasamin Farajzadeh

doi:10.1016/j.ortho.2016.04.001

Cited by 4 publications

(4 citation statements)

References 14 publications

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“…Elastic modulus 66 GPa [20] 66 GPa [20] 66 GPa [20] 69 GPa [21] 69 GPa [21] 69 GPa [21] 90 GPa [22] 90 GPa [22] 90 GPa [22] 157.6 GPa [17] 157.6 GPa [17] 157.6 GPa [17] 168 GPa [20] 168 GPa [20] 168 GPa [20] 200 GPa [23] 200 GPa [23] 200 GPa [23] Cross-section 0.016″ × 0.022″ [24] 0.016″ × 0.022″ [24] 0.016″ × 0.022″ [24] 0.017″ × 0.025″ [24] 0.017″ × 0.025″ [24] 0.017″ × 0.025″ [24] 0.018″ × 0.025″ [24] 0.018″ × 0.025″ [24] 0.018″ × 0.025″ [24] 0.019″ × 0.025″ [25] 0.019″ × 0.025″ [25] 0.019″ × 0.025″ [25] Activation force 1-3 N at a 0.5-N interval 1-3 N at a 0.5-N interval 1-3 N at a 0.5-N interval the leg step distance and elastic modulus ( Fig. 5d-e).…”

Section: Variations Vertical Loop L-loop T-loopmentioning

confidence: 99%

Finite element analysis of archwire parameters and activation forces on the M/F ratio of vertical, L- and T-loops

Cai¹

2020

BMC Oral Health

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Background: The ability of a loop to generate a certain moment/force ratio (M/F ratio) can achieve the desired tooth movement in orthodontics. The present study aimed to investigate the effects of elastic modulus, crosssectional dimensions, loop configuration geometry dimensions, and activation force on the generated M/F ratio of vertical, L-and T-loops.Methods: A total of 120 three-dimensional loop models were constructed with the Solidworks 2017 software and used for simulating loop activation with the Abaqus 6.14 software. Six vertical loop variations, 9 L-loop variations, and 9 T-loop variations were evaluated. In each group, only one parameter was variable [loop height, ring radius, leg length, leg step distance, legs distance, upper length, different archwire materials (elastic modulus), crosssectional dimension, and activation force].Results: The simulation results of the displacement and von Mises stress of each loop were investigated. The maximum displacement in the height direction was recorded to calculate the M/F ratio. The quantitative change trends in the generated M/F ratio of the loops with respect to various variables were established.Conclusions: Increasing the loop height can increase the M/F ratio of the loop. This increasing trend is, especially, much more significant in T-loops compared with vertical loops and L-loops. In vertical loops, increasing the ring radius is much more effective than increasing the loop height to increase the M/F ratio of the loop. Compared with SS, TMA archwire loops can generate a higher M/F ratio due to its lower elastic modulus. Loops with a small crosssectional area and high activation force can generate a high M/F ratio. The introduction of a leg step to loops does not increase the M/F ratio of loops.

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Section: Variations Vertical Loop L-loop T-loopmentioning

confidence: 99%

Finite element analysis of archwire parameters and activation forces on the M/F ratio of vertical, L- and T-loops

Cai¹

2020

BMC Oral Health

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“…Comparing the developed approach to the current state-of-the art power-arms produces promising results. The current state-of-the-art interdisciplinary research concerning power-arms employs finite element analysis to focus the research more on the ideal power-arm placement on the tooth surface or the power-arm length [21,22]. Most of the research is not concerning the powerarm shape.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Modeling and 3D Printing of Biocompatible Orthodontic Power-Arm Design with Clinical Application

Thurzo

Kočiš²,

Novák

et al. 2021

Applied Sciences

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Three-dimensional (3D) printing with biocompatible resins offers new competition to its opposition—subtractive manufacturing, which currently dominates in dentistry. Removing dental material layer-by-layer with lathes, mills or grinders faces its limits when it comes to the fabrication of detailed complex structures. The aim of this original research was to design, materialize and clinically evaluate a functional and resilient shape of the orthodontic power-arm by means of biocompatible 3D printing. To improve power-arm resiliency, we have employed finite element modelling and analyzed stress distribution to improve the original design of the power-arm. After 3D printing, we have also evaluated both designs clinically. This multidisciplinary approach is described in this paper as a feasible workflow that might inspire application other individualized biomechanical appliances in orthodontics. The design is a biocompatible power-arm, a miniature device bonded to a tooth surface, translating significant bio-mechanical force vectors to move a tooth in the bone. Its design must be also resilient and fully individualized to patient oral anatomy. Clinical evaluation of the debonding rate in 50 randomized clinical applications for each power-arm-variant showed significantly less debonding incidents in the improved power-arm design (two failures = 4%) than in the original variant (nine failures = 18%).

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“…In addition, tipping can be further classified into uncontrolled tipping and controlled tipping. As an important parameter, the moment to force (M/F) ratio plays a key role in determination of the type of tooth movement [1,2].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the influences of bracket and force system in different directions on the moment to force ratio by finite element method

Tang

2018

J Wireless Com Network

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The human teeth face a variety of ways to move during orthodontic treatment. The types of orthodontic tooth movements have linked to the moment to force (M/F) ratio. This paper aims to determine the precise M/F ratios that generate different types of movements for the models with and without bracket, and the M/F ratios are compared between the force systems applied in buccal-lingual and distal-mesial direction for the mandible canine by using finite element method (FEM). A segment of mandible canine obtained from autopsy had been scanned with microcomputed tomography, and two finite element models with and without brackets were established. Each canine model was subjected to a force of 100 cN and varied M/F ratios from 0~12 in buccal-lingual and distal-mesial directions. We find that the model with a bracket required larger M/F ratio compared to the model without a bracket for the same tooth movement. For the different directions, the value of M/F ratio is larger in the buccal-lingual than in the distal-mesial direction. The geometry of the tooth and the PDL are gained from a regular patient. Therefore, the results are applicable to any canine, and the precise M/F values provide a theoretical basis for the orthodontist design optimal force system.

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Finite element analysis of the convergence of the centers of resistance and rotation in extreme moment-to-force ratios

Cited by 4 publications

References 14 publications

Finite element analysis of archwire parameters and activation forces on the M/F ratio of vertical, L- and T-loops

Finite element analysis of archwire parameters and activation forces on the M/F ratio of vertical, L- and T-loops

Three-Dimensional Modeling and 3D Printing of Biocompatible Orthodontic Power-Arm Design with Clinical Application

Analysis of the influences of bracket and force system in different directions on the moment to force ratio by finite element method

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