Effects of orthodontic miniscrew placement angle and structure on the stress distribution at the bone miniscrew interface – A 3D finite element analysis

Machado, Genevive L.

doi:10.1016/j.sjdr.2014.01.001

Cited by 14 publications

(19 citation statements)

References 25 publications

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“…Similar to the bone stresses, the stress values in the miniscrew were also below the yield stress of titanium (692 MPa) (9) indicating that the miniscrew has sufficient strength to resist retraction forces by both the methods with variable heights of miniscrew placement in clinically acceptable range.…”

Section: Discussionmentioning

confidence: 77%

“…All the stress values in the bone are well below the yield stress of the bone (200 MPa) (9) indicating that the bone has sufficient strength to resist retraction forces by both the methods with variable heights of miniscrew placement in clinically acceptable range. Von Mises stresses in miniscrew: The stresses in miniscrew showed variable pattern i.e.…”

Section: Discussionmentioning

confidence: 90%

“…(5) The clinical success of a miniscrew is mainly determined by the manner in which the mechanical stresses are transferred from the miniscrew to surrounding bone without generating forces of a magnitude that would jeopardize the longevity of the miniscrew. (9) This study is the first FEM study to attempt direct comparison of the stress patterns, in bone and miniscrew and displacement patterns of maxillary anterior teeth associated during en-masse retraction, with elastomeric chains and NiTi coil springs along two different force vectors.…”

Section: Discussionmentioning

confidence: 99%

“…FEM appears to be suitable for simulating complex mechanical stress situations in the maxillofacial region. (5) Various FEM studies have been done in the past regarding the optimal loading conditions for implant placement, (6) optimal force magnitude loaded to miniscrews, (7) effect of force directions, (3,8) miniscrew placement angle and structure on the stress distribution at the bone miniscrew interface (5,9) the roles of bone quality, loading conditions, screw effects, and implanted depth on the biomechanics of an orthodontic miniscrew system. (10) Influence of various miniscrew design factors, including thread depth, degree of taper, and taper length on insertion torque, pullout strength, stiffness, and screw displacement before failure have also been studied.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of stress distribution in bone and miniscrew and displacement pattern of maxillary anterior teeth by two methods of en-masse retraction: A 3-D finite element analysis

Jain¹,

Hattarki²,

Patel³

et al. 2017

IJODR

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Introduction: To move the teeth in a desired pattern, the appropriate direction of the force must be selected. An inappropriate force delivers unfavourable stresses in the supporting tissues resulting in poor prognosis. It is very difficult to measure stresses accurately in vivo. Finite element analysis provides a definitive solution. Aim: To compare the stress distribution in bone and miniscrew and displacement pattern of maxillary anterior teeth with two methods of en-masse retraction i.e. NiTi coil spring and elastomeric chain, with miniscrews placed at various heights using finite element analysis. Materials and Methods: Total of four models were created i.e. two models with retraction by elastomeric chain and two models with retraction by NiTi coil spring with the help of implant placed at 3 mm and 5 mm height from alveolar crest. Results were represented in the form of stress diagrams. Results and Conclusions: Retraction with elastomeric chain produces lesser amount of von Mises stress on the bone as well as mini-implant as compared to that with NiTi coil spring. Retraction with elastomeric chain produced more sagittal and vertical displacement of canines as compared to its effect on incisors. The overall displacement of anterior teeth in both vertical as well as in sagittal direction was found to be more with elastomeric chain as compared with NiTi coil spring. Both the methods for retraction resulted in same amount of palatal root movement irrespective of the force vector.

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Section: Discussionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison of stress distribution in bone and miniscrew and displacement pattern of maxillary anterior teeth by two methods of en-masse retraction: A 3-D finite element analysis

Jain¹,

Hattarki²,

Patel³

et al. 2017

IJODR

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“…Machado 28 had also found that, as the angle of implant insertion increased from 30° to 90°, stress induced in the implant also increased. They used a force of 200 g perpendicular to the long axis of miniscrew to simulate the reactionary force during en masse retraction.…”

Section: Discussionmentioning

confidence: 96%

Comparative Evaluation of Biomechanical Performance of Titanium and Stainless Steel Mini Implants at Different Angulations in Maxilla: A Finite Element Analysis

Sabley

Shenoy

Banerjee

et al. 2019

J Indian Orthod Soc

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Objective: To assess and compare the tensions and deformations (stresses and strains) generated after application of two types of forces (traction and torsion) in miniscrews of two different materials (titanium and stainless steel) placed at five different angulations. Materials and Methods: Three-dimensional models of the posterior maxillary area and the mini-implants were constructed using computer-aided design software program (CATIA P3 V5-6 R2015 B26 / 2016; Dassault Systèmes). Titanium and stainless steel materials were used for miniscrews. The area constructed was in between the maxillary second premolar and first molar. The models with mini-implants were inserted at five different angulations (30°, 45°, 60°, 75° and 90°). Torsional and tractional forces were applied on these implants, and the models were solved using ANSYS 10.0. Stress generated in implant and in the cortical and cancellous bones was evaluated and compared at all the five angulations. Results: Stress generated in stainless steel mini-implant during torsional and linear force application was less when compared with titanium mini-implant. Also, stress generated in implants of both materials increased as the angle increased from 30° to 90°. Difference in stress generated by stainless steel implant in the cortical bone for both linear and torsional forces was less when compared with titanium implant, whereas for cancellous bone, the difference was insignificant at all the angles. Conclusion: Irrespective of angles, difference in stress generated in stainless steel implants and titanium implants for both the forces was not significant, and hence, stainless steel implants can be used effectively in a clinical setting.

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Evaluation of stress pattern in periodontium and change in inclination during en masse retraction: Finite element analysis

Kalia

Gupta

Ahuja

et al. 2019

Journal of the World Federation of Orthodontists

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Effects of orthodontic miniscrew placement angle and structure on the stress distribution at the bone miniscrew interface – A 3D finite element analysis

Cited by 14 publications

References 25 publications

Comparison of stress distribution in bone and miniscrew and displacement pattern of maxillary anterior teeth by two methods of en-masse retraction: A 3-D finite element analysis

Comparison of stress distribution in bone and miniscrew and displacement pattern of maxillary anterior teeth by two methods of en-masse retraction: A 3-D finite element analysis

Comparative Evaluation of Biomechanical Performance of Titanium and Stainless Steel Mini Implants at Different Angulations in Maxilla: A Finite Element Analysis

Evaluation of stress pattern in periodontium and change in inclination during en masse retraction: Finite element analysis

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