Abstract
ABSTRACTObjective: The aim of his study was to evaluate the stress on tooth and alveolar bone caused by orthodontic intrusion forces in a supraerupted upper molar, by using a three-dimensional Finite Element Method (FEM). Methods: A superior maxillary segment was modeled in the software SolidWorks 2010 (SolidWorks Corporation, Waltham, MA, USA) containing: cortical and cancellous bone, supraerupted first molar, periodontal tissue and orthodontic components. A finite element model has simulated intrusion forces of 4N onto a tooth, directed to different mini-screw locations. Three different intrusion mechanics vectors were simulated: anchoring on a buccal mini-implant; anchoring on a palatal mini-implant and the association of both anchorage systems. All analyses were performed considering the minimum principal stress and total deformation. Qualitative analyses exhibited stress distribution by color maps. Quantitative analysis was performed with a specific software for reading and solving numerical equations (ANSYS Workbench 14, Ansys, Canonsburg, Pennsylvania, USA). Results: Intrusion forces applied from both sides (buccal and palatal) resulted in a more homogeneous stress distribution; no high peak of stress was detected and it has allowed a vertical resultant movement. Buccal or palatal single-sided forces resulted in concentrated stress zones with higher values and tooth tipping to respective force side. Conclusion: Unilateral forces promoted higher stress in root apex and higher dental tipping. The bilateral forces promoted better distribution without evidence of dental tipping. Bilateral intrusion technique suggested lower probability of root apex resorption.
Highlights
Oral rehabilitation is a complex topic that frequently involves various specialists
Results were analyzed in minimum principal stress and total deformation
The present study evaluated by finite element analysis the stress distribution in a maxillary first molar and alveolar bone after simulation of an intrusion force
Summary
Oral rehabilitation is a complex topic that frequently involves various specialists. This process may be hindered by the presence of malocclusions. Dental supraeruption is one of the most complex conditions to be reversed.[1]. Supraeruption is derived from the lacking of antagonistic teeth and the absence of occlusal contact.[1] Some different techniques have been described in the literature such as loops,[2] transpalatal arch, extraoral devices[3] and lately, the use of mini-screws.[1] Another possibility to remove the occlusal interference is total crown preparation; when there is a substantial amount of tooth structure to be worn, previous endodontic treatment is necessary.[1,4]
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