THE OPTIMAL ATTACHMENT DESIGN AND POSITION DURING ORTHODONTIC TREATMENT WITH REMOVABLE THERMOPLASTIC ALIGNER FOR EXTRUSION OF MAXILLARY CENTRAL INCISOR:FINITE ELEMENT ANALYSIS

Objectives:Finite element analysis (FEA) is a non-invasive virtual model it has the advantage of being able to forecast the results without direct application to patients.The current study was conducted to simulate various shapes and positions of attachments for the extrusion orthodontic treatment scenarios of maxillary central incisor using the FEA to originate the optimum shape of attachment for each condition and to analyse the best position for attachments by simulating diverse attachment positions for each attachment. Materials and Methods:This study was conducted to identify the optimal attachment designs (square, round, and triangle) and positions (incisal, middle, and gingival) with RTA during extrusion and intrusion movement of a maxillary central incisor model tooth using FEA. To construct several models and evaluate stress distribution and displacement for comparative analysis, this study used FEA.Specimens preparation was performed as 3D finite geometric models.This study did not employ statistical analysis. Results: The round-shaped attachment was projected to be the most suitable attachment form for the extrusion of maxillary incisor tooth movement. The lower middle position is optimal during central incisor extrusion. Conclusion:When the attachments were manufactured in a round shape and placed in the lower middle position a lot of stress was applied to them by the RTA orthodontic device.