Comparison of En-Masse Retraction in Sliding Mechanics with Different Bracket Slot Using Mini-Implants at Different Vertical Levels- A 3d Fem Study.
Journal Title: International Journal of Dental Science and Innovative Research (IJDSIR) - Year 2019, Vol 2, Issue 2
Abstract
Aims and Objectives: The present study was done to evaluate and compare vertical and sagittal teeth movement during en masse retraction in sliding mechanics by altering the vertical levels of force application in posterior region. i.e. High Pull, Medium Pull, Low Pull and from a conventional Molar hook in 0.018 x 0.028 and 0.022 x 0.028 bracket slot by using 3 D Finite Element analysis. Materials and Methods: Two maxillary 3 D finite element models, one for 0.022 x 0.028 bracket slot, one for 0.018 x 0.028 bracket slot were generated using ANSYS (version 14.5) software, simulating sliding mechanics for en-masse retraction of maxillary anterior teeth by altering the vertical levels of force application in posterior region. The results were expressed in form of Von Mises scale depicting the coloured chart. Results: when force is applied from molar hook, 4.5mm mini-implant height and 13.5 mm mini-implant height, less tipping and more intrusion movement of anterior teeth was found in 0.018 x 0.028 bracket slot size than that in 0.022 x 0.028 bracket slot size. When the force is applied from 9mm implant height, similar movement of anterior teeth was seen in 0.018 x 0.028 as well as 0.22 x 0.028 slot bracket size. Conclusion: It can be concluded from this study that, Out of four different levels of force application, Medium pull implant serves as an ideal position for en masse retraction in both 0.018 bracket slot as well as 0.022 bracket slot.. According to severity of vertical dentoalveolar excess or gummy smile, amount of intrusion with en mass retraction of anterior teeth can be varied by varying the height of implant placement in which higher the implant placement more will be the intrusion.
Authors and Affiliations
Dr. Mansi Kadivar
Keywords
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