Factors controlling anterior torque during C-implant-dependent en-masse retraction without posterior appliances

Mo, Sung‐Seo; Kim, Seong Hun; Sung, Si‐Young; Chung, Kyu‐Rhim; Chun, Youn-Sic; Kook, Yoon‐Ah; Nelson, Gerald

doi:10.1016/j.ajodo.2009.09.026

Cited by 20 publications

(21 citation statements)

References 21 publications

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“…The force application close to the centre of resistance (CR) can be achieved by modifying the heights of force application source (mini-implants at different heights) and the position of anteriorretraction hook (Chang Y et al, [11]). The finite element analysis was selected for this study because of its advantages like, it is a non-invasive technique, the object of interest can be studied in three dimensions, the actual physical properties of the materials involved can be simulated and the tooth, alveolar bone and the PDL can be simulated when the material properties of these structures are assigned, it is nearest that one possibly can get in simulating the oral environment in-vitro, the actual displacement of the tooth can be visualized, the actual stress experienced at any given point can be measured, the model can be magnified infinitely [12,14]. .…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Torque Loss in En-Masse Retraction of Maxillary Anterior Teeth Using Miniimplants with Force Vectors at Different Levels: 3D FEM Study

Parashar¹,

Aileni

Rachala

et al. 2014

JCDR

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Section: Discussionmentioning

confidence: 99%

“…A retraction force of 150gm/side was applied bilaterally similar to that mentioned in Mo SS et al, [12] study. The analysis was carried out and deformation/movement was calculated and represented in Y and Z axis.…”

Section: Materials Property Data Representationmentioning

confidence: 99%

Torque Loss in En-Masse Retraction of Maxillary Anterior Teeth Using Miniimplants with Force Vectors at Different Levels: 3D FEM Study

Parashar¹,

Aileni

Rachala

et al. 2014

JCDR

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“…13 Mo et al studied the length of the retraction arm and degree of gable bend when using a C-implant as the exclusive source of anchorage in retraction of the anterior segment. 12 In each of these studies, the focus is on a segment of teeth bound at the contact points. The model in the present study looks closely at the interaction between the archwire and brackets, while individual teeth are not bound together at the contact points.…”

Section: Discussionmentioning

confidence: 99%

“…5–10 Kim et al, 11 Mo et al, 12 and Sung et al 13 included brackets and wires to study the retraction of the anterior segment, however the teeth were bonded together at the contact points and at between the wire and the braces rather than individually ligated to the archwire with contact interfaces. These point force models did not recreate the unloading force that is expressed by orthodontic wires in clinic.…”

Section: Introductionmentioning

confidence: 99%

A novel biomechanical model assessing continuous orthodontic archwire activation

Canales

Larson

Grauer

et al. 2013

American Journal of Orthodontics and Dentofacial Orthopedics

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Objective The biomechanics of a continuous archwire inserted into multiple orthodontic brackets is poorly understood. The purpose of this research was to apply the birth-death technique to simulate insertion of an orthodontic wire and consequent transfer of forces to the dentition in an anatomically accurate model. Methods A digital model containing the maxillary dentition, periodontal ligament (PDL), and surrounding bone was constructed from human computerized tomography data. Virtual brackets were placed on four teeth (central and lateral incisors, canine and first premolar), and a steel archwire (0.019″ × 0.025″) with a 0.5 mm step bend to intrude the lateral incisor was virtually inserted into the bracket slots. Forces applied to the dentition and surrounding structures were simulated utilizing the birth-death technique. Results The goal of simulating a complete bracket-wire system on accurate anatomy including multiple teeth was achieved. Orthodontic force delivered by the wire-bracket interaction was: central incisor 19.1 N, lateral incisor 21.9 N, and canine 19.9 N. Loading the model with equivalent point forces showed a different stress distribution in the PDL. Conclusions The birth-death technique proved to be a useful biomechanical simulation method for placement of a continuous archwire in orthodontic brackets. The ability to view the stress distribution throughout proper anatomy and appliances advances understanding of orthodontic biomechanics.

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“…by several different techniques, including the photoelastic method 2 , the strain gauge method 3 , and the finite element FE analysis method [4][5][6][7][8][9] . Studies using FE analysis have elucidated the points of force on teeth, force strength, and direction.…”

Section: Introductionmentioning

confidence: 99%

Experimental Verification of Finite Element Analysis for a Thermoplastic Orthodontic Aligner

Fujita

Kimura

Yanagisawa

et al. 2014

Showa Univ J Med Sci

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: In recent years, good outcomes have been reported using transparent and removable orthodontic appliances known as aligners. However, unpredicted tooth movement that contradicted 3-dimensional image simulations was observed in some cases. These anomalies could relate to biomechanical factors ; in particular, the characteristics of mechanical loading applied to the periodontal ligament and the tooth crown by aligners remain unclear. This study examines the biomechanical characteristics of aligners by a new method as follows : 1 development of an experimental model using artificial teeth and plastic aligners ; 2 finite element FE modeling and analysis using computed tomography CT images of the experimental model ; and, 3 comparison among observations of this actual model and standard FE analysis results. Roots of two arti cial teeth were covered by silicone material at 1.0 mm intervals for each coronal proximal surface and plastic clear aligners were manufactured based on another model in which the interval was reduced to 0.0 mm to simulate bodily movement. An FE analysis model of this 1.0 mm teeth interval was reconstructed from the CT images. A virtual aligner based on the FE model was also generated with a 0.0 mm interval. Changes in space between the root surface and silicone in both the actual and FE model were compared with the aligner tted in the initial model. Identical tendencies of movement were observed in both experimental results -the arti cial teeth and computational results of FE analysis. Our method using an experimental and computational approach proved useful to examine aligner characteristics ; the use of such a biomechanical approach could further our understanding of aligner treatments.

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Factors controlling anterior torque during C-implant-dependent en-masse retraction without posterior appliances

Cited by 20 publications

References 21 publications

Torque Loss in En-Masse Retraction of Maxillary Anterior Teeth Using Miniimplants with Force Vectors at Different Levels: 3D FEM Study

Torque Loss in En-Masse Retraction of Maxillary Anterior Teeth Using Miniimplants with Force Vectors at Different Levels: 3D FEM Study

A novel biomechanical model assessing continuous orthodontic archwire activation

Experimental Verification of Finite Element Analysis for a Thermoplastic Orthodontic Aligner

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