A FINITE ELEMENT ANALYSIS OF MOLAR INTRUSION WITH AND WITHOUT MICROOSTEOPERFORATION AND ITS INFLUENCE IN ROOT RESORPTION

Abstract

One of the most common iatrogenic effects of orthodontic treatment is orthodontically induced inflammatory root resorption (OIIRR). The etiology of root resorption is multifactorial and yet to be understood completely. Among the known factors, the most common factors are improper orthodontic force and there exists a positive correlation between increased orthodontic force levels and root resorption.

Aim Of The Study: The aim of this a finite element study is to analyse the impact of microosteoperforation on miniscrew assisted maxillary posterior intrusion on the stress distribution at PDL, alveolar bone & root surface and its contribution in reducing root resorption.

Materials & Method: 3D Model of entire maxilla was constructed from CBCT images. MBT brackets of 0.022” slot dimensions, miniscrews(1.3mm x 9mm) and 019” x 0.025” stainless steel wires, lingual buttons, Niti coil spring(9mm) were reverse engineered. The physical properties of teeth, surrounding structure and materials being used were incorporated to the model.  200gms of force was loaded from miniscrews using Niti coil springs and the stress generated was evaluated on the tooth and surrounding structures by finite element analysis.

Results: The von mises stress generated at the experimental side (MOP side) was lower when compared with the control side (Non-MOP side) at the tooth(11.46 MPa vs 18.90 Mpa) and the alveolar bone(0.21MPa Vs 0.24 MPa).Our study also shows that the deformation in the experimental side(2.2x10^-2) was lesser when compared to the deformation attained on the control side(4.0x10^-2)

Conclusion: Microosteoperforation had been found to be effective method for rapid orthodontic tooth movement The above study concludes that the stress levels and deformation experienced by tooth and surrounding tissues can be lowered by microosteoperforation procedure and thereby aid in preventing root resorption.