CANINE RETRACTION BY SLIDING MECHANICS

–A FEM Comparative Study using 3 Different

Dimensions of arch wires

Dr.S.Suchindran

Post Graduate Student

Department of Orthodontics

Meenakshi Ammal Dental College

& Hospital

INTRODUCTION

When an orthodontic force is applied to a tooth , stresses and strains are produced in the surrounding bone . Absorption of alveolar bone occurs in a region of compressive stress , whereas apposition of the alveolar bone occurs in a region of tensile stress. By this bone remodeling action the tooth movement is achieved. To plan the tooth movement , a clinician must understand the force to be applied to the tooth and the stress distribution in the PDL

AIM OF THE STUDY To study the force distribution on and

around the canine during individual canine retraction by sliding mechanics using standardized nickel titanium closed coil spring on 0.016” round , 0.016” 0.016” square and 0.016” 0.022” rectangular stainless steel arch wires on an 0.018” Roth slot , and there by to assess the kind of probable tooth movement that can be achieved using the above mentioned arch wires.

STANDARDIZATION CRITERIA : - FEM* modeling of a maxillary canine ,

premolar and molar with respective 0.018” slot PEA bracket .

- FEM modeling of different wires i.e 0.016”round 0.016”0.016 and 0.016 0.022

-standardization of the distance between the canine hook and the molar hook by statistically analyzing 30 study models of patients who are undergoing Orthodontic treatment in our department.

- -Standardization of the force levels depending on the standardized distance obtained from statistically analyzed study models.

method of study fem modeling of one posterior segment with

the respective brackets will be dine and the standardized force values generated .

the force level distribution will be tabulated and analyzed\zed which will be substantiated with suitable photographs.

the force lo\level and the force distribution with

3different arch wires during canine retraction will be compared and analyzed.