Evaluations of miniscrew type-dependent mechanical stability

Han, Cheol-Min; Watanabe, Keiichiro; Tsatalis, Andrea E.; Lee, Damian J.; Zheng, Fengyuan; Kyung, Hee-Moon; Deguchi, Toru; D, Kim

doi:10.1016/j.clinbiomech.2019.06.016

Cited by 20 publications

(16 citation statements)

References 25 publications

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“…Literature review has showed that the researches, relating to the loss of primary stability of mini-screws, no analyzes the unscrewing induced by the force applied to the wire but performed only pull out [ 5 , 11 ], bend [ 23 ] or fracture tests [ 12 , 15 ]. So they are not comparable with what has been analyzed and tested in our work because they had effort on different mechanics.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, when we consider the primary stability of a mini-screw, we must relate it to different factors such: bone density [ 6 , 10 ], cortical thickness [ 5 , 21 ], the inclination of insertion [ 7 , 11 ] and insertion torque [ 17 ]. The influence of many of these factors can, hence, as emerges from our study, be minimized with a two-miniscrew system, where load and torsion forces are best issued.…”

Section: Discussionmentioning

confidence: 99%

“…Many factors are decisive for their primary stability. These include the insertion angle [ 4 ], bone mineral density (BMD) of the receiver site, screw design [ 3 , 5 , 6 , 7 ], number of screws used as an anchoring unit.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Evaluation of the Stability of One or Two Miniscrews under Loading on Synthetic Bone

Pradal

Nucci

Derton

et al. 2020

JFB

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The aim of the present study was to evaluate the primary stability of a two-miniscrew system inserted into a synthetic bone and to compare the system with the traditional one. Forty-five bi-layered polyurethane blocks were used to simulate maxillary cancellous and cortical bone densities. Samples were randomly assigned to three groups—one-miniscrew system (Group A, N = 23), two-miniscrew system (Group B, N = 22) and archwire-only (Group C, N = 10). A total of 67 new miniscrews were subdivided into Group A (23 singles) and Group B (22 couples). 30 mm of 19″ × 25″ archwires were tied to the miniscrew. The load was applied perpendicularly to the archwire. Maximum Load Value (MLV), Yield Load (YL) and Loosening Load (LL) were recorded for each group. The YL of Group B and C had a mean value respectively of 4.189 ± 0.390 N and 3.652 ± 0.064 N. The MLV of Group A, B and C had a mean value respectively of 1.871 ± 0.318N, of 4.843 ± 0.515 N and 4.150 ± 0.086 N. The LL of Group A and B had a mean value respectively of 1.871 ± 0.318 N and of 2.294 ± 0.333 N. A two- temporary anchorage device (TAD) system is on average stiffer than a one-TAD system under orthodontic loading.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Mechanical Evaluation of the Stability of One or Two Miniscrews under Loading on Synthetic Bone

Pradal

Nucci

Derton

et al. 2020

JFB

View full text Add to dashboard Cite

show abstract

“…Despite the aforementioned advantages, surgical failure may arise, such as accidental injury to the surrounding tissue (root of the tooth and inferior alveolar nerve), inflammation and infection of surrounding tissue after insertion, and the fracturing of orthodontic miniscrew caused by excessive torque during removal. However, the main reason behind such failure may be that insertion positions cannot provide sufficient stability for the orthodontic miniscrew 11 – 13 . The lower is the stability after inserting, the higher is the possibility of orthodontic miniscrew loosening 14 , 15 .…”

Section: Introductionmentioning

confidence: 99%

Bone quality affects stability of orthodontic miniscrews

Tsai

et al. 2022

Sci Rep

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The objective of this study was to evaluate the effect of bone–miniscrew contact percentage (BMC%) and bone quality and quantity on orthodontic miniscrew stability and the maximum insertion torque value (ITV). Orthodontic miniscrews of five different dimensions and several bovine iliac bone specimens were used in the evaluation. Miniscrews of each dimension group were inserted into 20 positions in bovine iliac bone specimens. The experiment was divided into three parts: (1) Bone quality and quantity were evaluated using cone-beam computed tomography (CBCT) and microcomputed tomography. (2) The 3D BMC% was calculated. (3) The ITVs during miniscrew insertion were recorded to evaluate the stability of the orthodontic miniscrews. The results indicated that longer and thicker miniscrews enabled higher ITVs. CBCT was used to accurately measure cortical bone thickness (r = 0.939, P < 0.05) and to predict the bone volume fraction of cancellous bone (r = 0.752, P < 0.05). BMC% was significantly influenced by miniscrew length. The contribution of cortical bone thickness to the ITV is greater than that of cancellous bone structure, and the contribution of cortical bone thickness to BMC% is greater than that of cancellous bone structure. Finally, the higher is BMC%, the greater is the ITV. This study concludes that use of CBCT may predict the mechanical stability of orthodontic miniscrews.

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“…The successful use of TSADs in the clinic is highly related to their stability [ 15 , 16 , 17 ]. Several studies consider miniscrew design according to the requirements of clinical stability [ 18 , 19 , 20 , 21 , 22 , 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Head Hole Position on the Rotational Resistance and Stability of Orthodontic Miniscrews: A Three-Dimensional Finite Element Study

Choi

Kim

et al. 2021

Sensors

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The orthodontic miniscrew is driven into bone in a clockwise direction. Counter-clockwise rotational force applied to the implanted miniscrew can degrade the stability. The purpose of this three-dimensional finite element study was to figure out the effect of shifting the miniscrew head hole position from the long axis. Two miniscrew models were developed, one with the head hole at the long axis and the other with an eccentric hole position. One degree of counter-clockwise rotation was applied to both groups, and the maximum Von-Mises stress and moment was measured under various wire insertion angles from −60° to +60°. All Von-Mises stress and moments increased with an increase in rotational angle or wire insertion angle. The increasing slope of moment in the eccentric hole group was significantly higher than that in the centric hole group. Although the maximum Von-Mises stress was higher in the eccentric hole group, the distribution of stress was not very different from the centric hole group. As the positive wire insertion angles generated a higher moment under a counter-clockwise rotational force, it is recommended to place the head hole considering the implanting direction of the miniscrew. Clinically, multidirectional and higher forces can be applied to the miniscrew with an eccentric head hole position.

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Evaluations of miniscrew type-dependent mechanical stability

Cited by 20 publications

References 25 publications

Mechanical Evaluation of the Stability of One or Two Miniscrews under Loading on Synthetic Bone

Mechanical Evaluation of the Stability of One or Two Miniscrews under Loading on Synthetic Bone

Bone quality affects stability of orthodontic miniscrews

Effect of Different Head Hole Position on the Rotational Resistance and Stability of Orthodontic Miniscrews: A Three-Dimensional Finite Element Study

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