Comparative analysis of stress patterns between mono-cortical and bi-cortical mini-screws: A three dimensional finite element analysis

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Original Article

Author Details : Shankar D*, Dahiya A , Singh G , Kannan S , Kaul A

Volume : 1, Issue : 1, Year : 2017

Article Page : 21-25

https://doi.org/10.18231/j.jco.2017.031

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Abstract

Materials and methods: 3D finite element model of maxillary bone (both cortical and cancellous) and mini-screws were generated
on a computer to evaluate stress values at bone and mini-screw interface with varying the angle of insertion, length and diameter. Miniscrews
having diameter of 1.6 mm and 2 mm were used. The length of miniscrews was fixed at 8 mm, 10 mm and 12 mm. These were
inserted at 4 different insertion angles of 450, 600, 750 and 900.
Results: Comparison of the maximum von Mises stress in the cortical and cancellous bone showed that stress/strain field that
develops at the mini-screw and bone interface decreased with increase in diameter, length and insertion angle of the mini-screw.
Conclusion: Wider bi-cortical mini-screws should be preferred over mono-cortical mini-screws and should be placed as perpendicular
to the bone as possible for better and enhanced stability.
Keywords: Mini-screw, Finite Element Analysis, Mono-cortical, Bi-cortical

How to cite : Shankar D, Dahiya A, Singh G, Kannan S, Kaul A, Comparative analysis of stress patterns between mono-cortical and bi-cortical mini-screws: A three dimensional finite element analysis. J Contemp Orthod 2017;1(1):21-25

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