Biomechanical effectiveness of cortical bone thickness on orthodontic microimplant stability: An evaluation based on the load share between cortical and cancellous bone

Alrbata, Raed H.; Yu, Wonjae; Kyung, Hee-Moon

doi:10.1016/j.ajodo.2014.04.018

Cited by 27 publications

(27 citation statements)

References 26 publications

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“…As it is now well-established that cortical bone thickness (CBT) is considered a major determinant of microimplant retention, the impact of forces was analyzed relative to different CBTs. Based on our previous study, 11 3-D CAD models of titanium alloybased OMIs and a cylindrical bone piece 7.5 mm in height and 5.6 mm in diameter were established ( Figure 1) and exported to FE software (Deform v6.1, Scientific Forming Technologies, Columbus, Ohio). The OMIs were No.…”

Section: Methodsmentioning

confidence: 99%

“…The maximum compressive stress (peak stress [PS]) developed at a point of intimate contact of the OMI and cortical bone (Point A) was then calculated using the five points; this stress level was considered a reference to compare with the reported maximum compressive stress of around 54.8 MPa, which is equivalent to 24000 micro strain, the point at which pathological cortical bone resorption might occur. 11,[18][19][20] For the Figure 1. Geometric assembly of OMI and bone specimens used in the study after meshing step, with mesh window shown for the cortical bone and the force (F) applied along the y-axis.…”

Section: Methodsmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

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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“…FEA is particularly suitable for a biological structure analysis as it allows great flexibility in dealing with geometric complex domains composed of multiple materials [2, 6–8]. In the present study, an advanced approach representing the bone implant interfaces was adopted wherein [9] different percentages of bone-implant osseointegration were implemented in the FE models and the biomechanical behavior of miniscrew and the supporting tissue with the various bone-implant interfaces was predicted and compared.…”

Section: Introductionmentioning

confidence: 99%

Biomechanical Effects of Various Bone-Implant Interfaces on the Stability of Orthodontic Miniscrews: A Finite Element Study

Tan

Wang

Yang

et al. 2017

Journal of Healthcare Engineering

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Introduction Osseointegration is required for prosthetic implant, but the various bone-implant interfaces of orthodontic miniscrews would be a great interest for the orthodontist. There is no clear consensus regarding the minimum amount of bone-implant osseointegration required for a stable miniscrew. The objective of this study was to investigate the influence of different bone-implant interfaces on the miniscrew and its surrounding tissue. Methods Using finite element analysis, an advanced approach representing the bone-implant interface is adopted herein, and different degrees of bone-implant osseointegration were implemented in the FE models. A total of 26 different FE analyses were performed. The stress/strain patterns were calculated and compared, and the displacement of miniscrews was also evaluated. Results The stress/strain distributions are changing with the various bone-implant interfaces. In the scenario of 0% osseointegration, a rather homogeneous distribution was predicted. After 15% osseointegration, the stress/strains were gradually concentrated on the cortical bone region. The miniscrew experienced the largest displacement under the no osseointegra condition. The maximum displacement decreases sharply from 0% to 3% and tends to become stable. Conclusion From a biomechanical perspective, it can be suggested that orthodontic loading could be applied on miniscrews after about 15% osseointegration without any loss of stability.

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“…The influence of cortical bone thickness into the primary stability was attested by different authors in terms of screw-bone interlocking [7][8][9]. Although a positive correlation was identified between cortical thickness and primary stability, an excessive thick and dense cortical thickness can contribute to screw failure [7].…”

Section: Introductionmentioning

confidence: 99%

“…Although a positive correlation was identified between cortical thickness and primary stability, an excessive thick and dense cortical thickness can contribute to screw failure [7]. In maxillofacial region, different works showed that failures in temporary screws due to its stability loss occurred when screws were placed in the thickest and densest cortical areas available, as observed in the posterior buccal region of a mandible [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Primary Stability of Temporary Screws after Dentary and Orthopedic Forces under Static and Dynamic Load Cycles

Fernandes

Barbosa

Ferreira

et al. 2017

Metals

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Abstract:The objective was to analyze the influence of dentary and orthopedic forces under static and dynamic loads in temporary screw stability. Self-drilling titanium (Ti6Al4V) screws (6 × 1.5 mm) were inserted and removed from pig ribs. Screws were loaded by static loads of 2 N and 5 N for 5 weeks. Dynamic force was applied during 56,000 cycles for simulations of a patient's opening-closing mouth movements. Dynamic applied loads ranged from 2 to 5 N and from 5 to 7 N under a frequency of 1 Hz.Torque peak values at placement and removal were measured before and after static and dynamic cycles. Similarities in torque peaks (p = 0.3139) were identified at placement (12.54 Ncm) and removal (11.2 Ncm) of screws after a static load of 2 N. Statistical comparisons showed significant stability loss after dynamic cycles under loads of 2 N (64.82% at p = 0.0005) and 5 N (64.63% at p = 0.0026). Limited stability loss occurred in temporary screws submitted to 2 N static forces (p = 0.3139). The detrimental effects of dynamic cycles in temporary screws stability was attested after the simulation of dentary and skeletal forces, being intermittent forces more relevant in the loss of mechanical stability.

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Biomechanical effectiveness of cortical bone thickness on orthodontic microimplant stability: An evaluation based on the load share between cortical and cancellous bone

Cited by 27 publications

References 26 publications

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

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

Biomechanical Effects of Various Bone-Implant Interfaces on the Stability of Orthodontic Miniscrews: A Finite Element Study

Primary Stability of Temporary Screws after Dentary and Orthopedic Forces under Static and Dynamic Load Cycles

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