Year : 2022

Volume : Volume 13

Issue : Issue 6

Address for correspondence :
Dr. Sunaina,
sunainadungriyal287@gmail.com

Abstract

Objectives: The objectives of this study were as follows: (1) To evaluate von Mises stress on mandibular bone with ramus screw and T-loop spring in impacted 40° mandibular second molars (MM2) and (2) to evaluate the displacement and von Mises stress on ramus screw and T-loop spring during uprighting of 40° MM2. Materials and Methods: A surface 3D model of the mandibular jaw containing impacted MM2 reconstructed from the cone-beam computed tomography image. To upright the impacted MM2 with ramus screw, a button bonded on distal surface of impacted MM2 and an elastomeric chain was stretched between ramus screw and bondable button. For uprighting impacted MM2 with T-loop spring, the titanium molybdenum alloy wire was adapted to fit passively into the brackets on the anchor teeth and gabled at T to exert an uprighting force on 40° MM2. Results: The von Mises stress on the mandibular bone in 40° MM2 with ramus screw was greater compared to the T-loop spring. The displacement and von Mises stress in the ramus screw were greater compared to the T-loop spring during uprighting 40° MM2. Conclusions: This finite element analysis revealed that the stress on ramus screw was greater to offer an efficient and innovative possibility for utilizing anchorage to upright impacted 40° MM2.

Keywords: Imapcted manibular second molar, Ramus screw, T-loop spring.