Deflection and stress distribution around mini-screw implants: A finite element investigation into the effect of cortical bone thickness, force magnitude and direction

Meher, Abhishek H; Shrivastav, Sunita; Vibhute, Pavankumar Janardan; Hazarey, Pushpa V

doi:10.1179/1465312512z.00000000037

Cited by 7 publications

(7 citation statements)

References 21 publications

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“…In an in vitro study Abhishek Meher et al . ( 18 ), described similar outcomes of deflections. Greater stress and deflection was observed with 1.5mm rather than 2mm cortical bone thickness.…”

Section: Discussionmentioning

confidence: 70%

Deflection of mini implants from its intended path of placement on varying bone densities

Annamalai¹,

Bharathan²,

Anbarasu³

et al. 2022

J Clin Exp Dent

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Background Knowledge of bone density in maxilla and mandible will allow the clinician to plan the anchorage strategies and placement of implants with necessary precautions. The study aims to evaluate the deflection changes of titanium alloy self-drilling mini implants from the intended path that occurs during placement in varying bone densities. Material and Methods 63 titanium alloy self-drilling mini implants of the lengths 6mm, 8mm, and 10mm with diameter of 1.3mm were placed in three homogenous solid rigid polyurethane foam (saw bone) with bone densities of 20pcf, 30pcf, and 40pcf simulating anatomic sites in maxilla and mandible. 7mini implants of each length in all bone densities were tested for study. The implants were inserted perpendicularly into artificial bone block held in a custom made stand. The bone blocks were then radiographically exposed and the deviation of the long axis of the implantfrom a true vertical line was measured. Results There was a decrease in deflection of the mini implant with increase in density. On the other hand, increase in length resulted in increase in the amount of deflection. Conclusions Longer mini implants can be used in less dense bone as in maxilla, whereas shorter mini implants can be used in high dense bone as in mandible to increase the stability and success rate of implants. Bone density and implant length play a role in deflection of mini implant from its intended path of insertion. Key words: Orthodontic Mini implants, deflection, bone density, anchorage.

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Section: Discussionmentioning

confidence: 70%

Deflection of mini implants from its intended path of placement on varying bone densities

Annamalai¹,

Bharathan²,

Anbarasu³

et al. 2022

J Clin Exp Dent

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“…The angle of mini-screw insertion should be less than 90 • because an angulated rather than perpendicular insertion is thought to increase the relative thickness of the cortical bone. 1 Achieving a perpendicular or 90 • placement may insert the mini implant in areas closer to roots.…”

Section: Discussionmentioning

confidence: 99%

“…With the advent of mini-implants after the pioneering studies, it is widely used by several Orthodontists as they offer "Absolute Anchorage". It was believed that, despite intense bone remodeling activity, the implants do not move considerably in response to the Orthodontic force and this was later proven wrong with the use of FEM study, 1 and other clinical research were done. The maximum deflection of 2.06 and 2.87 mm was found at the cortical bone interface under loading of 200 and 300 g, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Angulation of mini-implant with the long axis of the root has been suggested to be an important factor that contributes to the increased failure rate if it is not adequate. Meher (2012) 1 stated that the use of an angulated loading force to a perpendicularly placed mini-screw at 110-130 • , rather than 70 to 90 • minimizes stress and deflection, thereby increasing stability.…”

Section: Introductionmentioning

confidence: 99%

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Comparative evaluation of accuracy and stability of Orthodontic temporary anchorage device with and without the use of Mini-implant placement guiding device (MIG-20) in adults- An in vivo study

Agrawal,

Shrivastav,

Kamble

et al. 2024

JCO

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Mini implants have been researched extensively in terms of their efficiency, material used, and methods of accurate placement. When properly used,they might be a substitute method of anchorage preparation as compared toconventional molar anchorage and might reach alike or even superior results in certaincases.The present study aimed to evaluate and compare accuracy and stability of orthodontic temporary anchorage device with and without the use of Mini-implantplacement guiding device (MIG-20) in adults.Each patient underwent implant placement using both methods to have a similar oral environment for groups. Each case was treated in a split-mouth pattern to eliminateselection bias (to have the same baseline characteristics for both groups). Sideselection for that particular method was undertaken by using computer-generatedrandomization. So in all 2 groups were categorized. Mini-implant inserted by theconventional method (Control Group). Group II: Mini- Implant inserted by using MIG-20. Mini-implants were placed on both sides of the maxillary jaw between the 1 st molarand 2 nd premolar with the self-drilling manual method. Evaluation of clinical pictures, pre and post RVG and stability/mobility were done for each sample in both groupsusing AutoCAD software 2013.Out of 21 cases in Control group, it was observed that100% of cases in Control group had a vertically deviated mini-implant, which was statistically significant as compared to Study group, where 28.57% (6) cases demonstrated vertical deviation and 71.43 % (15) cases, where no deviation of miniimplantwas seen in vertical dimension when observed clinically. (p=0.0001, S). In71.43 % of cases, no significant variation was observed clinically in Study Group inmesiodistal dimension. (p=0.0001, S).The findings of the study substantiate the effectiveness of the 3-D Mini-Implant placement guide (MIG-20) when compared to the conventional method, inachieving a more accurate mesiodistal and vertical placement of mini implants.

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“…16 Mini-implant deflection and stress distribution was evaluated by Meher AH et al using FEM. 17 Lee et al tried to establish a correlation between the influence of placement angle and the application of orthopedic force. 18 The stability of mini-implants was reduced when the placement angles was less than 60* with various directions of orthopedic forces.…”

Section: Fem and Mini -Implantsmentioning

confidence: 99%

Applications of Three Dimensional Finite Element Method in Orthodontics

2015

IJDA

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The aim of this paper is to enumerate the various applications of 3D finite element method in Orthodontics. A literature search was done in pub med, embase and cochrane. All articles related to the application of 3D finite element in orthodontics were collected. The articles were categorized into various subheadings based on their use. The various applications of 3D finite element method in orthodontics have been described in a systematic manner.

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Deflection and stress distribution around mini-screw implants: A finite element investigation into the effect of cortical bone thickness, force magnitude and direction

Abstract: The MES and MD both decrease as the angulation of mini-screw loading increases, with increasing load differences occur in MD but the MES remains similar, whilst differences were observed in both MES and MD as CBT increased.

Cited by 7 publications

References 21 publications

Deflection of mini implants from its intended path of placement on varying bone densities

Deflection of mini implants from its intended path of placement on varying bone densities

Comparative evaluation of accuracy and stability of Orthodontic temporary anchorage device with and without the use of Mini-implant placement guiding device (MIG-20) in adults- An in vivo study

Applications of Three Dimensional Finite Element Method in Orthodontics

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