Evaluation and Comparison of Biomechanical Properties of a New “PRP Loop” with that of Opus Loop and L-Loop - a FEM Study

Introduction: Closure of space is a salient factor in orthodontic treatment. Friction and frictionless mechanics are the methods of extraction space closure. Retraction loops eg. T loop, Opus loop, K Sir loop, L loop etc used force system as frictionless mechanics. An attempt has been made to blend the design of both Opus and L loops to form a new loop called “PRP loop” so that the beneficial properties of L loop and Opus loop can be integrated into the new loop. This study is therefore undertaken to evaluate the biomechanical effect of PRP loop and compare it to the “L loop and Opus loop”.

Objectives: To evaluate and compare the moment to force ratio of PRP loop, Opus loop and L loop fabricated in “0.019×0.025 inch” and “0.017×0.025 inch” “TMA wire with and” without any “ preactivation bends” and to “compare the moment to force ratio” of PRP loop with “Opus loop”, and L loop fabricated in 0.019×0.025 wire with those fabricated in 0.017×0.025 wire.

Methodology: PRP loop, “L loop and Opus loop” will be fabricated in “0.019×0.025 and 0.017×0.025 inch TMA wire” without pre activation bends. Using the dHAL software moment to force ratio will be calculated for PRP loop of “0.019×0.025 inch” and “0.017×0.025 inch” “TMA wire with and” without different degrees of alpha pre-activation bends.

Ansys 16.0 finite element analysis software will be used to form the loops of three dimensional model after that the forces and moments in all three dimensions will be studied.

Expected Result: The moment to force of PRP loop will be evaluated to so that optimum force level can be determined to prove its clinical efficiency.

Conclusion: No such study has been done on PRP loop. Hence, a study is planned to evaluate and compare the ”biomechanical properties of PRP loop with that of Opus loop and L loop”