Thread shape affects the stress distribution of torque force on miniscrews: a finite element analysis

Ye, Yu-Shan; Yi, Wu; Zhuang, Peilin; Liu, Mo; Yu, Yijun; Lü, Yong; Yao, Qinghe; Wang, Wei; Chang, Shaohai

doi:10.1080/10255842.2020.1784884

Cited by 6 publications

(9 citation statements)

References 30 publications

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“…square). 10 Another previous study showed that thread shape could also influence the axial pullout strength of miniscrews and compared with the other shapes (buttress, 75°joint profile, rounded, and trapezoidal), the buttress reverse thread shape provided the greatest pullout strength. 37 However, there were no studies on the torque or resonance frequency analysis of miniscrews with different thread shapes at present.…”

Section: Discussionmentioning

confidence: 96%

“…4 Stability is influenced by multiple factors, such as miniscrew design, cortical bone thickness, marrow bone density, and operator technique. [5][6][7][8][9][10] There are many methods used to detect the primary stability of miniscrews, including measurements of insertion and removal torque values, resonance frequency analysis (RFA), and periotest value. [11][12][13][14][15] Usually, orthodontic miniscrews bear horizontal force to close the gap.…”

Section: Introductionmentioning

confidence: 99%

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Primary stability analysis of the torque-resistant orthodontic miniscrew anchorage

Hao

et al. 2022

Advances in Mechanical Engineering

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Though miniscrews are widely used as a temporary anchorage device, research focusing on the primary stability of miniscrew loading torque force is limited. This study is aimed to design a novel torque-resistant miniscrew used as orthodontic anchorage (TRO-screws) and to compare the difference of primary stability between TRO-screws and commercial miniscrew anchorage (COM-screws) using torque tests and resonance frequency analysis (RFA). Fresh swine ribs were cut into pieces of 20 mm × 13 mm × 11 mm, and each piece was implanted with one screw after a 1.5 mm-deep hole with a diameter of 1.0 mm was pre-drilled. There were 20 TRO-screws and 20 COM-screws. Maximum insertion torque (MIT) and maximum removal torque (MRT) were measured. The implant stability quotient (ISQ) was recorded parallel to and perpendicular to the long axis of teeth respectively. The measurement was repeated three times for each direction, and the ISQ values were averaged and recorded as the ISQpar, ISQper, and ISQm. The mean values of MIT for TRO-screws and COM-screws were 11.86±1.58 N cm and 10.36±1.42 N cm. The mean values of MRT for TRO-screws and COM-screws were 8.45±2.24 N cm and 6.76±1.78 N cm. The mean values of ISQ for TRO-screws and COM-screws were 61.80±2.9 and 58.15±2.98. These indicated that TRO-screws were more stable than COM-screws. We found that the primary stability of the TRO-screw was better than that of the COM-screw.

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Section: Discussionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Primary stability analysis of the torque-resistant orthodontic miniscrew anchorage

Hao

et al. 2022

Advances in Mechanical Engineering

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“…The biomechanical parameters of the material, including Young's modulus and Poisson's ratio of cortical bone, cancellous bone, and miniscrew, are presented in Table 1 . They were set in previous studies, and they are the reference for our study [ 24 – 26 , 28 – 30 ].…”

Section: Methodsmentioning

confidence: 99%

“…The Max EQV in cortical bone was used to represent the deformation resistance of the bone under torque load. The smaller the Max EQV index, the smaller the stress that the surrounding tissue received; then, the possibility of cortical bone being damaged tends to be lesser [ 26 ]. Max DM indicates the micromovement of the microimplant under stress, representing the mobility of the microimplant.…”

Section: Methodsmentioning

confidence: 99%

“…By improving the microimplant's thread design, its initial stability under the torque force can be easily optimized. Based on our previous research, we have proposed the application of this new type of micro-implant and the design requirements on length, diameter, and thread shape [ 15 , 22 – 26 ]. Here, a further study was done on the thread depth and pitch design requirements of the new microimplant for the torque force during the dental treatment, which could promote the initial stability of the microimplant under the torque force.…”

Section: Introductionmentioning

confidence: 99%

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Optimization Analysis of Two-Factor Continuous Variable between Thread Depth and Pitch of Microimplant under Toque Force

Jiao

Fan

et al. 2022

Computational and Mathematical Methods in Medicine

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Microimplant, an anchorage device, is widely applied in clinical orthodontic treatment. Since tooth torque is required to be controlled during orthodontic tooth movement, a novel microimplant needs to be developed to apply better torque force during orthodontic. In this study, the optimal value ranges of thread depth and pitch under toque force were studied for choosing microimplant with relevant value ranges in clinical design from biomechanical perspective. Finite element analysis (FEA) and optimization design technology were used for accessing the optimal value ranges of thread depth and pitch under toque force. Thread depth ( D ) (0.1 mm to 0.4 mm) and pitch ( P ) (0.4 mm to 1 mm) were used as continuous variables, with the other parameters as constant, and the optimal value ranges were obtained by analyzing the tangent slope and sensitivity of the response curve. When a torque force of 6 Nmm was applied on the microimplant, the maximum equivalent stress (Max EQV) of cortical bone and maximum displacements (Max DM) of microimplant were analysis indexes. When 0.55 mm ≤ P ≤ 1 mm , the Max EQV of cortical bone was relatively smaller with less variation range. When 0.1 mm ≤ D ≤ 0.35 mm , the Max DM of microimplant was relatively smaller with less variation range. So in conclusion, the initial stability of microimplants with pitch 0.55 mm ≤ P ≤ 1 mm and thread depth 0.1 mm ≤ D ≤ 0.35 mm was better with the torque force applied.

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Development of reduced volume endosseous cuspid tooth implant using topology optimization by SIMP technique for improved osseointegration

Soni,

Shrivastava,

Rai

2023

Computer Methods in Biomechanics and Biomedical Engineering

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Thread shape affects the stress distribution of torque force on miniscrews: a finite element analysis

Cited by 6 publications

References 30 publications

Primary stability analysis of the torque-resistant orthodontic miniscrew anchorage

Primary stability analysis of the torque-resistant orthodontic miniscrew anchorage

Optimization Analysis of Two-Factor Continuous Variable between Thread Depth and Pitch of Microimplant under Toque Force

Development of reduced volume endosseous cuspid tooth implant using topology optimization by SIMP technique for improved osseointegration

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