Finite Element Analysis of Stress in Maxillary Dentition during En-masse Retraction with Implant Anchorage.

Finite Element Analysis of Stress in Maxillary Dentition during En-masse Retraction with Implant Anchorage. Bull Tokyo Dent Coll. 2019 Jan 31;: Authors: Suzuki M, Sueishi K, Katada H, Togo S Abstract The goal of this study was to investigate how the height of the archwire hook and implant anchor affect tooth movement, stress in the teeth and alveolar bone, and the center of resistance during retraction of the entire maxillary dentition using a multibracket system. Computed tomography was used to scan a dried adult human skull with normal occlusion. Three-dimensional models of the maxillary bone, teeth, brackets, archwire, hook, and implant anchor were created and used for finite element analysis. The heights of the hook and the implant anchor were set at 0, 5, or 10 mm from the archwire. Orthodontic force of 4.9 N was systematically applied between the hook and the implant anchor and differential stress distributions and tooth movements observed for each traction condition. With horizontal traction, the archwire showed deformation in the superior direction anterior to the hook and in the inferior direction posterior to the hook. Differences in traction height and direction resulted in different degrees of deformation, with biphasic movement clearly evident both in front of and behind the hook. With horizontal traction of the hook at a height of 0 mm, all the teeth moved distally, but not with any other type of traction. At a height o...
Source: The Bulletin of Tokyo Dental College - Category: Dentistry Authors: Tags: Bull Tokyo Dent Coll Source Type: research