Evaluation of Optimal Implant Positions and Height of Retraction Hook for Intrusive and Bodily Movement of Anterior Teeth in Sliding Mechanics: A FEM Study

Ashekar, Shrinivas S; Deshpande, Rahul S; Shetty, Pravin; Lele, Sandip; Patil, Shailesh S

doi:10.5005/jp-journals-10021-1208

Cited by 4 publications

(16 citation statements)

References 10 publications

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“…The force levels passing from the high pull implant to the retraction hook will cause intrusion and from the medium pull implants shows bodily movement and low pull implant showed tipping forces. A study conducted by Shrinivas S Ashekar et al [39] suggest that the force levels passing from the high pull implant to the retraction hook will cause intrusion and from the medium pull implant shows bodily movement and the low pull implant showed tipping forces which supports the present study. So, the high pull implants show high intrusive effect, and the canines showed extrusion in all cases as the retraction force is more towards the canine as the tipping of the canines is observed.…”

Section: Discussionsupporting

confidence: 87%

Evaluating the effects of consolidation on intrusion and retraction using temporary anchorage devices—a FEM study

et al. 2017

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BackgroundExtraction of premolars and retracting the anterior teeth using mini-implants and anterior retraction hooks became advent now a day. In such treatments, consolidation of arches is not done in regular practice. So, the present study is concentrated on effects of consolidation in two implant and three implant combinations of retraction and intrusion.MethodsA three-dimensional FEM model of maxillary teeth and periodontal ligament housed in the alveolar bone with the first premolars extracted is generated with appropriate number of elements and nodes. The models were broadly divided into two groups according to the no. of implants. Mini-implants were placed bilaterally between the second premolar and molar at varying heights (7, 10, 13 mm) in group I, and along with bilateral implants, an additional mid-implant is placed between the central incisors as group II. Brackets with 0.022 slot were placed on the teeth, 19 × 25 SS wire is placed in the brackets, an anterior retraction hook was placed at 9 mm height, and analysis was done to evaluate the stresses and displacement patterns in consolidation and non-consolidation models.ResultsThe results showed that consolidation of the anterior teeth during intrusion and retraction shows various advantages such as less stresses on the bone, PDL, implant, teeth, and no labial flaring of the anterior teeth and three implant system, i.e., two bilateral implant at 10 mm and a mid-implant at 12 mm between the centrals has shown to be better than other models as bodily movement is observed.ConclusionConsolidation is better than non consolidation during enmasse retraction and intrusion.

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Section: Discussionsupporting

confidence: 87%

Evaluating the effects of consolidation on intrusion and retraction using temporary anchorage devices—a FEM study

et al. 2017

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“…Chetan et al 17 showed retraction component of force reduces by around 1% and the intrusion component of force increases by around 0.3% for each millimeter apical placement of the screw. Ashekar et al 16 proved that low mini-implant placement (6 mm) causes anterior teeth to tip, mid-implant placement (8 mm) causes bodily movement, and high implant placement (10 mm) shows intrusion in the FEM model. The ideal height for the bilateral implant position for the retraction of the anterior teeth is 10 mm 20 .…”

Section: Position Of Mini-screwmentioning

confidence: 99%

“…Zhang et al, 13 Sung et al, 14 Kojima et al, 15 Ashekar et al, 16 Chetan et al, 17 Hedayati et al, 19 Namburi et al, 20 Bohara et al, 23 and Suzuki et al 24 used ANSYS software for simulation, whereas Jain et al have not mentioned the software used for the study. Kojima et al, 15 Suzuki et al, 24 and Parashar et al 18 designed an FEM model based on the CT scan and converted it into a 3D model, while other studies such as Ashekar et al, 16 Chetan et al, 17 and Hedayati et al 19 designed a model based on Wheeler's dental anatomy textbook. Jain et al 22 and Bohara et al 23 did not quote the model design.…”

Section: Summary Of Evidencementioning

confidence: 99%

“…The method of retraction and force used for retraction varied in the studies. The force of 150 gm was used in studies conducted by Zhang et al, 13 Ashekar et al, 16 Chetan et al, 17 Hedayati et al, 19 Shreevats et al, 21 Jain et al, 22 Bohara et al, 23 and Suzuki et al 24 Sung et al 14 and Parashar et al 18 used 200 gm of force and Namburi et al 20 used 120 g for retraction and 60 gm for the intrusion. Jain et al 22 showed the method of en-masse retraction using NiTi spring in comparison with the power chain.…”

Section: Summary Of Evidencementioning

confidence: 99%

“…The positioning of ARH in between lateral incisors and canine was common, and this was specifically mentioned in the 12 studies. Zhang et al 13 considered a molar hook for deciding the dimensions of ARH, whereas an arch wire was reported as the reference plane in studies by Sung et al, 14 Kojima et al, 15 Ashekar et al, 16 Chetan et al, 17 Parashar et al, 18 Hedayati et al, 19 Namburi et al, 20 Shreevats et al, 21 and Suzuki et al 24 Biomechanical effects of different positions of mini-screw were compared with the fixed dimension of ARH by Chetan et al 17 (2-mm ARH), Namburi et al 20 (9 mm), and Bohara et al 23 (6-mm ARH for gingival model and 2-mm ARH for incisal model), respectively, whereas other studies such as those by Zhang et al, 13 Sung et al, 14 Kojima et al, 15 Ashekar et al, 16 Parashar et al, 18 Hedayati et al, 19 and Suzuki et al 24 evaluated different dimensions of ARH with fixed position of mini-screw. Sung et al 14 and Hedayati et al 19 varied the ARH for four different heights.…”

Section: Summary Of Evidencementioning

confidence: 99%

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The Effect of Varied Positioning of Mini-screw, Anterior Retraction Hook, and Resultant Force Vector on Efficient En-Masse Retraction Using Finite Element Method: A Systematic Review

Agrawal

Subash

2021

J Indian Orthod Soc

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Objective: The objective of this systematic review was to assess the available evidence to evaluate the effectiveness of en-masse retraction design with mini-screw with respect to the retraction hook and mini-implant position and height. Methods: The following electronic databases were searched till July 31, 2020: Pro-Quest Dissertation Abstracts and Thesis database Cochrane Central Register of Controlled Trials (CENTRAL), PubMed, Google Scholar, US National Library of Medicine, and National Research Register. En-masse retractions with anterior retraction hooks assisted by mini-implant three-dimensional finite element method (3D FEM) models were included in the study. The selected studies were assessed for the risk of bias using the Cochrane Collaboration risk of bias tool. The “traffic plot” and “weighted plot” risk of bias distribution were designed using the ROBVIS tool. The authors extracted and analyzed the data. Results: Twelve studies fulfilled the inclusion criteria. The risks of biases were low for 9 studies and high for 3 studies. Data on mini-implant, retraction hook, and the center of resistance/force vectors were extracted. The outcomes of the included studies were heterogeneous. Conclusions: According to the currently available literature review for successful bodily en-masse tooth movement, the force vector should pass through the center of resistance, which can be achieved by the clinical judgment of placing a mini-screw and an anterior retraction hook. The force from an implant placed at a higher level from the anterior retraction hook will cause intrusion; an implant placed at the medium level shows bodily movement; and an implant placed at a lower level shows tipping forces in consolidated arches.

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Stress Distribution and Displacement of Maxillary Anterior Teeth During En-masse Intrusion and Retraction: A FEM Study

Bohara

Kumar

Sharma

et al. 2017

J Indian Orthod Soc

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Background: Space closure by en masse intrusion and retraction in orthodontics is of particular interest. Aim: The aim of this study was to evaluate the stress distribution and displacement of maxillary anterior teeth. Materials and Methods: Four different finite element models of maxillary arch were constructed to understand the nature of stresses and displacement patterns of anterior teeth during en masse intrusion and retraction on force application with different combinations of mini-implants and retraction hooks. Results: In this study, tensile stresses were seen in the cervical region and various movements of teeth such as lingual crown tipping, bodily movement, lingual root tipping, intrusion, and extrusion were observed. Conclusion: Nature of stresses changes from tensile to compressive from cervical area to apical area. Various tooth displacements suggest that different combinations of mini-implants and retraction hooks affect the direction of the tooth movement.

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Evaluation of Optimal Implant Positions and Height of Retraction Hook for Intrusive and Bodily Movement of Anterior Teeth in Sliding Mechanics: A FEM Study

Cited by 4 publications

References 10 publications

Evaluating the effects of consolidation on intrusion and retraction using temporary anchorage devices—a FEM study

Evaluating the effects of consolidation on intrusion and retraction using temporary anchorage devices—a FEM study

The Effect of Varied Positioning of Mini-screw, Anterior Retraction Hook, and Resultant Force Vector on Efficient En-Masse Retraction Using Finite Element Method: A Systematic Review

Stress Distribution and Displacement of Maxillary Anterior Teeth During En-masse Intrusion and Retraction: A FEM Study

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