Bone stress for a mini-implant close to the roots of adjacent teeth - 3D finite element analysis

Motoyoshi, Mitsuru; Ueno, Shunkichi; Okazaki, Kumiko; Shimizu, Nobutaka

doi:10.1016/j.ijom.2009.02.011

Cited by 76 publications

(64 citation statements)

References 18 publications

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“…The N1 design, engaged mostly in cortical bone, has the potential to be clinically superior as it can avoid root proximity in areas with adequate cortical bone thickness, which is a major factor in mini-implant loosening and risk of root resorption and ankylosis. 18,19,27 Furthermore, in carefully selected cases, N1 can not only reduce the risk of damage to neurovascular bundle and sinuses but can also perform en masse retraction more efficiently without the limitation of inter radicular space. The MIT of N1 (15.6 Ncm), however, exceeds recommended insertion torque range of 5 to 10 Ncm, 25 and N1 has a low torque ratio of MRT to MIT because of this high MIT.…”

Section: Discussionmentioning

confidence: 99%

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Stability comparison between commercially available mini-implants and a novel design: Part 1

Hong¹,

Lee²,

Webster³

et al. 2011

The Angle Orthodontist

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Objective: To compare mechanical stability among five mini-implant designs-a newly invented design and four commercially available designs that vary by shape and threading; to calculate external surface area of each design using high-resolution micro-computed tomography; and to evaluate the relationship between surface area and stability results. Materials and Methods: The four commercially available mini-implants-single-threaded and cylindrical (SC), single-threaded and tapered (ST), double-threaded and cylindrical (DC), doublethreaded and tapered (DT)-and a new implant that is designed to engage mostly in cortical bone with shorter and wider dimensions (N1) were inserted in simulated bone with cortical and trabecular bone layers. The mechanical study consisted of torque measurements and lateral displacement tests. External surface area was computed using a 25-mm micro-CT. Results: Maximum insertion torque, maximum removal torque, and force levels for displacements were the highest in N1, followed by DT, ST, DC, and SC (a 5 .05). The surface area was largest in DT, followed by N1, ST, DC, and SC. Surface area engaged in cortical bone, however, was the greatest in N1. The surface area of mini-implants had positive correlation with stability. Conclusion: Among commercial designs, both added tapering and double threading improved stability. N1 was the most stable design within this research design. The new design has the potential to be clinically superior; it has enhanced stability and there is diminished risk of endangering nearby anatomic structures during placement and orthodontic treatment, but the design requires refinements to reduce insertion torque to avoid clinical difficulty and patient discomfort. (Angle

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Section: Discussionmentioning

confidence: 99%

“…17 The aim of this study was to compare the stability among five mini-implant designs using torque and lateral displacement tests. As root proximity 5 and root contact are major factors in mini-implant failure, 18,19 a new design (N1) was invented. The N1 design is short to engage mostly in cortical bone but wide to optimize stability.…”

Section: Introductionmentioning

confidence: 99%

Stability comparison between commercially available mini-implants and a novel design: Part 1

Hong¹,

Lee²,

Webster³

et al. 2011

The Angle Orthodontist

View full text Add to dashboard Cite

show abstract

“…3) were based on the series of previous studies. [19][20][21][22] The loads were applied for a mouth minimally interincisal open (5 mm) 19 that induces the most stress in the condyle. 3N.…”

Section: Methodsmentioning

confidence: 99%

Treatment of high fracture of the neck of the mandibular condylar process by rigid fixation performed by lag screws: Finite element analysis

Kozakiewicz¹,

Świniarski²

2017

Dent. Med. Probl.

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“…23,24 Excessive force application may result in unwanted compressive stresses that contribute to the development of microdamage of the cortical bone areas contacting the microimplant. Microdamage is a permanent deformation of the microstructure of loaded cortical bone in the form of fatigue and creep, manifesting histologically as microcracks around the implants and leading to osteolysis around the implant and loss of stability.…”

Section: Discussionmentioning

confidence: 99%

Optimal force magnitude loaded to orthodontic microimplants: A finite element analysis

Alrbata

Momani

Al-Tarawneh

et al. 2015

The Angle Orthodontist

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Objective: To find an optimal force that can be loaded onto an orthodontic microimplant to fulfill the biomechanical demands of orthodontic treatment without diminishing the stability of the microimplant. Materials and Methods: Using the finite element analysis method, 3-D computer-aided design models of a microimplant and four cylindrical bone pieces (incorporating cortical bone thicknesses of 0.5, 1.2, 2.0, and 3.0 mm) into which the microimplant was inserted were used. Various force magnitudes of 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, and 4.0 N were then horizontally and separately applied to the microimplant head as inserted into the different bone assemblies. For each bone/ force assembly tested, peak stresses developed at areas of intimate contact with the microimplant along the force direction were then calculated using regression analysis and compared with a threshold value at which pathologic bone resorption might develop. Results: The resulting peak stresses showed that bone pieces with thicker cortical bone tolerated higher force magnitudes better than did thinner ones. For cortical bone thicknesses of 0.5, 1.2, 2.0, and 3.0 mm, the maximum force magnitudes that could be applied safely were 3.75, 4.1, 4.3, and 4.45 N, respectively. Conclusions: For the purpose of diminishing orthodontic microimplant failure, an optimal force that can be safely loaded onto a microimplant should not exceed a value of around 3. 75-4.5 N. (Angle Orthod. 2016;86:221-226.)

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Bone stress for a mini-implant close to the roots of adjacent teeth - 3D finite element analysis

Cited by 76 publications

References 18 publications

Stability comparison between commercially available mini-implants and a novel design: Part 1

Stability comparison between commercially available mini-implants and a novel design: Part 1

Treatment of high fracture of the neck of the mandibular condylar process by rigid fixation performed by lag screws: Finite element analysis

Optimal force magnitude loaded to orthodontic microimplants: A finite element analysis

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