Comparative Evaluation of Stress Distribution Patterns and Location of Centre of Resistance During Temporary Anchorage Device Assisted Molar Intrusion With and Without Micro Osteoperforation: A Three-Dimensional Finite Element Analysis

INTRODUCTION: MicroOsteoPerforation (MOP) is a minimally invasive method to elicit an inflammatory response to accelerate tooth movement without compromising the supporting alveolar bone. Molar intrusion is a difficult tooth movement. Hence, micro osteoperforation can be used to facilitate molar intrusion to reduce the treatment duration by reducing the resistance to tooth movement. AIM OF THE STUDY: Our study compared the stress distribution patterns, the position of the center of resistance, and the amount of molar intrusion in temporary anchorage device assisted molar intrusion with microosteoperforation and temporary anchorage device (TAD) assisted molar intrusion without microosteoperforation using a finite element model (FEM). MATERIALS AND METHOD: A finite element model of maxilla with teeth, fixed orthodontic appliance was constructed with stainless steel metal brackets and molar bands. Full strap up with MBT prescription 0.022 slot was designed in the model. The simulation was to replicate and compare the clinical situation of a NiTi closed coil spring exerting a force of 1.96 Newtons directed apically on the first molar under the influence of 6 microosteoperforations, using mini-implants as anchorage units with NiTi closed coil spring exerting a force of 1.96 Newtons directed apically on the first molar without the influence of 6 microosteoperforations, using mini-implants as anchorage units. CONCLUSION: The study revealed that microosteoperforation reduced the stress experienced and, reduced the resistance to tooth movement. The center of resistance also shifted to a more favorable position. The displacement achieved was greater when microosteoperforation was done