Analysis of stress distribution in lingual orthodontics system for effective en-masse retraction using various combinations of lever arm and mini-implants: A finite element method study

Kushwah, Ashish; Kumar, Mukesh; Goyal, Manish; Premsagar, Shruti; Rani, Shikha; Sharma, Sonika

doi:10.1016/j.ajodo.2020.08.005

Cited by 21 publications

(7 citation statements)

References 19 publications

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“…The highest amount of stress was 85.65MPa in Case 2, which is far below the ultimate tensile strength, indicating that both cases were clinically safe. Khan et al 23 and Kushwah et al 27 also found that during distalization and en-masse retraction process, a von Mises stress below 135MPa is safe.…”

Section: Discussionmentioning

confidence: 98%

Comparative evaluation of displacement and stress distribution pattern during mandibular arch distalization with extra and inter-radicular mini-implants: a three-dimensional finite element study

MAHESHWARI,

CHAWDA,

KUSHWAH

et al. 2023

Dental Press J. Orthod.

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Objective: To compare the initial stress distribution and displacement on mandibular dentition using extra and inter-radicular mini-implants for arch distalization, by means of finite element analysis. Methods: For this study, two finite element models of the mandible were designed. The models consisted of periodontal ligament (PDL) and alveolar bone of all teeth until second molars. In the Case 1, bilateral extra-radicular buccal-shelf stainless steel mini-implants (10.0-mm length; 2.0-mm diameter) were placed between first and second permanent molars. In the Case 2, bilateral inter-radicular stainless steel mini-implants (10.0-mm length; 1.5-mm diameter) were placed between second premolar and first permanent molar. Power hook was attached between canine and first premolar at a fixed height of 8mm. In the two cases, 200g of distalization force was applied. ANSYS v. 12.1 software was used to analyze and compare von Mises stress and displacement in the mandibular dentition, PDL and bone. Results: Higher stresses were observed in mandibular dentition with the inter-radicular implant system. The amount of von Mises stress was higher for cortical bone (85.66MPa) and cancellous bone (3.64MPa) in Case 2, in comparison to cortical bone (41.93MPa) and cancellous bone (3.43MPa) in Case 1. The amount of arch distalization was higher for mandible in Case 1 (0.028mm), in comparison to Case 2 (0.026mm). Conclusion: Both systems were clinically safe, but extra-radicular implants showed more effective and controlled distalization pattern, in comparison to inter-radicular implants, in Class III malocclusion treatment.

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Section: Discussionmentioning

confidence: 98%

Comparative evaluation of displacement and stress distribution pattern during mandibular arch distalization with extra and inter-radicular mini-implants: a three-dimensional finite element study

MAHESHWARI,

CHAWDA,

KUSHWAH

et al. 2023

Dental Press J. Orthod.

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“…The most severe buccal tipping and extrusion of the distopalatal cusp were observed in model 4 in which only 1 MIA was used, because of the insufficient resistance of the archwire. Hence, sufficient anchorage must be applied on the palatal side, such as use of a modified transpalatal arch 38) and increase in the lingual-root torque. Overall, arbitrary control of the maxillary first molar, encompassing rotation and intrusion is feasible.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Maxillary First Molar Intrusion Mechanics with Mini-Implant Anchorages Using the Finite Element Method

Xiao

Pei

Xia

et al. 2023

J. hard tissue biol.

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This study aimed to evaluate the effect of the maxillary first molar intrusion mechanics with mini-implant anchorages on the Von Mises stress and initial displacement using finite element analysis. A three-dimensional finite model was established using Mimics 17.0, Geomagic Studio 2014, Unigraphics NX 8.5 and Ansys workbench 15 software based on original cone beam computed tomography data. Four loading methods were used. The displacement of the maxillary first molar was calculated along the x-, y-and z-axes, and the von Mises stress distribution was visualized using color-coded scales. Most of the stress was concentrated on the cervical or middle third of the roots of the maxillary first molar and decreased toward the apex in all models. The minimum and more uniform stress distribution appeared around the apical third of the roots. The strongest stress on the periodontal ligament (PDL) and alveolar bone was always around the cervical and root furcation. After intrusion, the maxillary first molar was bodily intruded without tipping in model 1, whereas buccal tipping was observed in models 2 and 4. In model 3, the molar had the tendency of mesial-lingual rotation. The vertical displacements were 95.3%, 79.6%, 95.3% and 79.6% of the total displacements of models 1-4, respectively. All cusps were uniformly intruded in models 1 and 3. Buccal cusps were intruded 50% more than the lingual cusps in model 2. All of the cusps were intruded except for the distal-lingual cusp in model 4. The apical third of the roots suffered the minimum stress and was not prone to evident resorption during intrusion, whereas the maximum stress on PDL was also maintained within the normal physiological range. Four loading methods were available for intrusion. Model 1 was the best, followed by models 2, 3 and 4. The tooth cusp conditions should be considered during molar intrusion.

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“…The maximum stress present on the alveolar bone was 0.675 MPa in the control model, which is much lower than the ultimate tensile strength of the alveolar bone [ 36 ]. Hence, the alveolar bone in all models was safe during the en-masse retraction and the application of intermaxillary elastics.…”

Section: Discussionmentioning

confidence: 99%

Biomechanical analysis of effective mandibular en-masse retraction using Class II elastics with a clear aligner: a finite element study

et al. 2022

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Background This study aimed to evaluate the displacement and stress distribution of mandibular dentition by various positions of the Class II elastics during en-masse retraction in clear aligner therapy. Methods Models including a mandibular dentition (without first premolars), periodontal ligament (PDL), mandible, as well as attachments, aligners and buttons were constructed and imported into Ansys Workbench 2019 (ANSYS, USA) to generate the three-dimensional (3D) finite element model. Six combinations were created: (1) aligner alone (control), (2)-(5) Class II elastics with buttons placed on the mesiobuccal (MB), distobuccal (DB), mesiolingual (ML) and distolingual (DL) surface of the mandibular first molar, and (6) Class II elastics with a button on the aligner corresponding to the mesiobuccal surface of the mandibular first molar (AMB). The elastic force was set to 2 N for simulations. Results The central incisors appeared lingual tipping in the six models. The lingual crown movement of the central incisors was 0.039 mm, 0.034 mm, 0.034 mm, 0.042 mm, 0.041 mm, and 0.034 mm for control model, MB model, DB model, ML model, DL model, and AMB model, respectively. The first molars showed mesial tipping in the six models. The mesial movement of the mesiobuccal cusps of the first molars was 0.045 mm, 0.060 mm, 0.063 mm, 0.048 mm, 0.051 mm, and 0.055 mm for control model, MB model, DB model, ML model, DL model, and AMB model, respectively. Conclusions Class II elastics reduced lingual tipping of anterior teeth but aggravated mesial tipping of posterior teeth. Mesiolingual elastics developed minimum mesial tipping of the posterior teeth. When Class II elastics are required, attaching elastics on the mesiolingual surface of the mandibular first molar is recommended to prevent mandibular anchorage loss.

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Analysis of stress distribution in lingual orthodontics system for effective en-masse retraction using various combinations of lever arm and mini-implants: A finite element method study

Cited by 21 publications

References 19 publications

Comparative evaluation of displacement and stress distribution pattern during mandibular arch distalization with extra and inter-radicular mini-implants: a three-dimensional finite element study

Comparative evaluation of displacement and stress distribution pattern during mandibular arch distalization with extra and inter-radicular mini-implants: a three-dimensional finite element study

Evaluation of Maxillary First Molar Intrusion Mechanics with Mini-Implant Anchorages Using the Finite Element Method

Biomechanical analysis of effective mandibular en-masse retraction using Class II elastics with a clear aligner: a finite element study

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