Effect of material variation on the biomechanical behaviour of orthodontic fixed appliances: a finite element analysis

Papageorgiou, Spyridon N.; Keilig, Ludger; Hasan, Istabrak; Jäger, Andreas; Bourauel, Christoph

doi:10.1093/ejo/cjv050

Cited by 34 publications

(31 citation statements)

References 54 publications

(54 reference statements)

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“…The finite element (FE) method has been suggested as a solution for complex biomechanical questions and has been applied in several cases in orthodontics (30,31) in order to assess the centre of resistance (32)(33)(34), various biomechanical aspects of tooth movement (35,36), different bracket (25,37), anchorage (38)(39)(40)(41)(42) or surgical (43,44) treatment modalities, debonding (45)(46)(47), and retention procedures (48). The reliability of FE analyses is dependent not only on the loading configuration, but also on the geometry of the structure and the material properties (30,49).…”

Section: Introductionmentioning

confidence: 99%

Torque differences according to tooth morphology and bracket placement: a finite element study

Papageorgiou

Sifakakis

Keilig

et al. 2016

EORTHO

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INTRODUCTION Torque of the maxillary incisors is essential in esthetics and proper occlusion, while torque expression is influenced by many factors. The aim of this finite element study was to assess the relative effect of tooth morphology, bracket prescription, and bracket positioning on tooth displacement and developed stresses/strains after torque application. METHODS A three-dimensional upper right central incisor with its periodontal ligament (PDL) and alveolus was modelled. The tooth varied in the crown-root angle (CRA) between 156°, 170°, and 184°. An 0.018-inch slot discovery® (Dentaurum, Ispringen, Germany) bracket with a rectangular 0.018 × 0.025-inch -titanium wire was modelled. Bracket torque prescription varied between 0°, 12°, and 22°, with bracket placement at the centre of the middle, gingival or incisal third of the crown. A total of 27 models were generated and a buccal root torque of 30°was applied. Afterwards, crown and apex displacement, strains in the PDL, and stresses in the bracket were calculated and analysed statistically. RESULTS The palatal crown displacement was significantly affected by bracket positioning (up to 94 per cent), while the buccal apex displacement was significantly affected by bracket prescription (up to 42 per cent) and bracket positioning (up to 23 per cent). Strains in the PDL were affected mainly by CRA (up to 54 per cent), followed by bracket positioning (up to 45 per cent). Finally, bracket prescription considerably affected the stresses in the bracket (up to 144 per cent). LIMITATIONS These in silico results need to be validated in vivo before they can be clinically extrapolated. CONCLUSION Tooth anatomy and the characteristics of the orthodontic appliance should be considered during torque application.

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Section: Introductionmentioning

confidence: 99%

Torque differences according to tooth morphology and bracket placement: a finite element study

Papageorgiou

Sifakakis

Keilig

et al. 2016

EORTHO

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“…As the outcome of fixed appliance therapy is bound to be affected by the bracket , the wire , and their interaction , a random‐effects model according to DerSimonian and Laird was deemed appropriate to incorporate this variability .…”

Section: Methodsmentioning

confidence: 99%

Lingual vs. labial fixed orthodontic appliances: systematic review and meta‐analysis of treatment effects

Papageorgiou

Gölz

Jäger

et al. 2016

European J Oral Sciences

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The aim of this systematic review was to compare the therapeutic and adverse effects of lingual and labial orthodontic fixed appliances from clinical trials on human patients in an evidence-based manner. Randomized and prospective non-randomized clinical trials comparing lingual and labial appliances were included. Risk of bias within and across studies was assessed using the Cochrane tool and the Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach. Random-effects metaanalyses were conducted, followed by subgroup and sensitivity analyses. Six electronic databases were searched from inception to July 2015, without limitations. A total of 13 papers pertaining to 11 clinical trials were included with a total of 407 (34% male/66% female) patients. Compared with labial appliances, lingual appliances were associated with increased overall oral discomfort, increased speech impediment (measured using auditory analysis), worse speech performance assessed by laypersons, increased eating difficulty, and decreased intermolar width. On the other hand, lingual appliances were associated with increased intercanine width and significantly decreased anchorage loss of the maxillary first molar during space closure. Based on existing trials, there is insufficient evidence to make robust recommendations for lingual fixed orthodontic appliances regarding their therapeutic or adverse effects, as the quality of evidence was low. AbstractAim of this systematic review was to compare the therapeutic and adverse effects of lingual and labial orthodontic fixed appliances from clinical trials on human patients in an evidence-based manner.Randomized and prospective non-randomized clinical trials comparing lingual and labial appliances were included. Risk of bias within and across studies was assessed with the Cochrane tool and the GRADE approach. Random-effects meta-analyses were conducted, followed by subgroup and sensitivity analyses. Six electronic databases were searched from inception to July 2015 without limitations. A total of 13 papers pertaining to 11 clinical trials were included with a total of 407 (119 male / 228 female) patients. Lingual appliances were associated with increased overall oral discomfort compared to labial appliances, increased speech impediment (measured with auditory analysis), worse speech performance assessed by laypersons, increased eating difficulty, and decreased intermolar width. On the other side, lingual appliances were associated with increased intercanine width and significantly decreased anchorage loss of the maxillary first molar during space closure. Based on existing trials, there is insufficient evidence to make robust recommendations for lingual fixed orthodontic appliances regarding their therapeutic or adverse effects, as the quality of evidence was low.Registration: PROSPERO (CRD42015024596)

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“…The brackets were modeled from scanned data using ATOS Triple Scan (GOM, Germany). The ligature of brackets was a stainless wire with a diameter of 0.01 inch and was modeled based on previous studies . This study was reviewed and approved by the Institutional Review Board of Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences (approved number: SIAT‐IRB‐140315‐H0050).…”

Section: Methodsmentioning

confidence: 99%

Simulation of orthodontic force of archwire applied to full dentition using virtual bracket displacement method

Zhang

Gan

Zhao

et al. 2019

Numer Methods Biomed Eng

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Objective Orthodontic force simulation of tooth provides important guidance for clinical orthodontic treatment. However, previous studies did not involve the simulation of orthodontic force of archwire applied to full dentition. This study aimed to develop a method to simulate orthodontic force of tooth produced by loading a continuous archwire to full dentition using finite element method. Method A three‐dimensional tooth‐periodontal ligament‐bone complex model of mandible was reconstructed from computed tomography images, and models of brackets and archwire were built. The simulation was completed through two steps. First, node displacements of archwire before and after loading were estimated through moving virtual brackets to drive archwire deformation. Second, the obtained node displacements were loaded to implement the loading of archwire, and orthodontic force was calculated. An orthodontic force tester (OFT) was used to measure orthodontic force in vitro for the validation. Results After the simulation convergence, archwire was successfully loaded to brackets, and orthodontic force of teeth was obtained. Compared with the measured orthodontic force using the OFT, the absolute difference of the simulation results ranged from 0.5 to 22.7 cN for force component and ranged from 2.2 to 80.0 cN•mm for moment component, respectively. The relative difference of the simulation results ranged from 2.5% to 11.0% for force component, and ranged from 0.6% to 14.7% for moment component, respectively. Conclusions The developed orthodontic force simulation method based on virtual bracket displacement can be used to simulate orthodontic force provided by the archwire applied to full dentition.

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Effect of material variation on the biomechanical behaviour of orthodontic fixed appliances: a finite element analysis

Abstract: According to the results of this finite element study, all components of the orthodontic fixed appliance, including wire, bracket, and adhesive, seem to influence, to some extent, the biomechanics of tooth movement.

Cited by 34 publications

References 54 publications

Torque differences according to tooth morphology and bracket placement: a finite element study

Torque differences according to tooth morphology and bracket placement: a finite element study

Lingual vs. labial fixed orthodontic appliances: systematic review and meta‐analysis of treatment effects

Simulation of orthodontic force of archwire applied to full dentition using virtual bracket displacement method

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