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:10.1177/0974909820130810s

Cited by 3 publications

(5 citation statements)

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“…Along the Y-axis, in Model 1, central incisor showed almost bodily movement while in Model 3, it showed lingual crown tipping. This observation is consistent with the studies done by Tominaga et al, [16] Zhang et al, [4] and Sung et al [12] While the study done by Ashekar et al [17] shows lingual tipping of central incisor when force applied at 0 mm, 5 mm, and 8 mm of ARH from low, medium, and high traction OMI. In this study, in Model 3, when force was applied onto the retraction hook of 2 mm placed incisally, more of lingual crown tipping occurred than in Model 1 where force is applied at the retraction hook of 6 mm.…”

Section: Displacement Along the Y-axissupporting

confidence: 91%

“…Such difference in the vertical movement of the central incisor could be due to the height of the retraction force and amount of lingual crown tipping of central incisors. As in a study done, intrusion of the incisors was seen when force was applied at 0 mm of ARH from medium and high traction OMI and 5 mm of ARH from high traction OMI [17] . However, placing mini-implants apically at higher levels possess difficulties and limitations.…”

Section: Displacement Along the Z-axismentioning

confidence: 52%

“…The direction of tooth rotation was changed from lingual crown tipping to lingual root tipping on increasing the height of the retraction hook. According to Ashekar et al, [17] labial tipping of incisors did not occurred in high mini-implant condition also. Thus, to maintain or gain the torque, it is beneficial to place the central midline mini-implant as placed in Model 2 and Model 4 in this study.…”

Section: Displacement Along the Y-axismentioning

confidence: 89%

“…As the force applied onto the incisal retraction, hook of 2 mm is away from the center of resistance, more of lingual crown tipping of incisors will occur. In a study done by Ashekar et al, [17] lateral incisor showed bodily movement only at 5 mm of ARH with medium traction OMI and at 8 mm of ARH from high OMI. In Model 2, lateral incisor showed the bodily movement while central incisor showed the lingual root tipping this difference is due to the force is applied from the central midline mini-implant on lateral incisor is far from the central incisor.…”

Section: Displacement Along the Y-axismentioning

confidence: 90%

“…This extrusion was slight and was limited to mostly crowns. Studies of Sung et al, [12] Zhang et al, [4] and Ashekar et al [17] showed intrusion of central incisors. Such difference in the vertical movement of the central incisor could be due to the height of the retraction force and amount of lingual crown tipping of central incisors.…”

Section: Displacement Along the Z-axismentioning

confidence: 99%

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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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Section: Displacement Along the Y-axissupporting

confidence: 91%

Section: Displacement Along the Z-axismentioning

confidence: 52%

Section: Displacement Along the Y-axismentioning

confidence: 89%

Section: Displacement Along the Y-axismentioning

confidence: 90%

Section: Displacement Along the Z-axismentioning

confidence: 99%

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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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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 evaluation during simultaneous intrusion and retraction of maxillary anteriors with mini-implants: A finite element analysis

Panika¹,

Bhardwaj²,

Raturi³

et al. 2022

JCO

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Space closure is one of the most challenging process in orthodontics and require a comprehension of biomechanics in order to avoid undesirable side effects. The versatility of Mini implants has increased its demand in respect of anchorage, minimizing reciprocal effects and reducing overall treatment duration. Bi-alveolar dental protrusion is one of the common malocclusion encountered by orthodontist and the most common treatment modality includes extraction of 4 first premolars followed by intrusion and retraction of maxillary anteriors to obtain ideal dental and soft tissue profile.Force application for longer duration can lead to orthodontic induced root resorption.Thus it is utmost important to study the amount of stress produced and pattern of stress distribution in PDL after force application. Thus with the help of FEM model stress evaluation was done during simultaneous intrusion and retraction of maxillary anteriors with the help of implants.

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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 3 publications

References 0 publications

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

Stress Distribution and Displacement of Maxillary Anterior Teeth During En-masse Intrusion and Retraction: 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 evaluation during simultaneous intrusion and retraction of maxillary anteriors with mini-implants: A finite element analysis

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