Document Type : Original Article
Author
Assistant Professor, Orthodontics Department, Dental School, Shiraz University of Medical Sciences.
Abstract
Headgear provides an extra-oral anchorage and is needed in many treatment procedures.Application of a headgear needs a complete knowledge of the involved active and reactive forces. The main goal of this study was to make clear the very events of a cervical headgear use. The finite element method of analysis was chosen to accomplish the research. A 3D F.E.M. model consisting of a cervical headgear and two separate blocks as the terminal molars was designed and a 200 grf. was applied at each side and the results were obtained. The most important result was the consideration of the elastic deformation of the outer bow and its effect on the force delivered to the terminal molar. A brief discussion of the differences between the manual calculation of the forces and the results obtained by the F.E.M. was presented at the end of the article.
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