Evaluation of Initial Stress Distribution and Displacement Pattern of Craniofacial Structures with 3 Different Rapid Maxillary Expansion Appliance Models: A 3-dimensional Finite Element Analysis.
| Autor: | Sucu M; Specialist in Orthodontics, Private practice, Istanbul, Turkey., Yilmaz B; Department of Orthodontics, Faculty of Dentistry, Bezmialem Vakif University, Istanbul, Turkey., Ramoğlu Sİ; Department of Orthodontics, Faculty of Dentistry, Altinbas University, Istanbul, Turkey. |
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| Jazyk: | angličtina |
| Zdroj: | Turkish journal of orthodontics [Turk J Orthod] 2021 Mar 01; Vol. 34 (1), pp. 18-25. Date of Electronic Publication: 2021 Mar 01 (Print Publication: 2021). |
| DOI: | 10.5152/TurkJOrthod.2021.20006 |
| Abstrakt: | Objective: This study aimed to describe the displacement of anatomical structures and the stress distributions caused by the Hyrax, fan-type, and double-hinged expansion screws via the 3-dimensional (3D) finite element method (FEM). Methods: The 3D FEM was based on the computed tomography data of a 12-year-old patient with a constricted maxilla. The Hyrax model included 1,800,981 tetrahedral elements with 2,758,217 nodes. The fan-type model included 1,787,558 tetrahedral elements with 2,737,358 nodes. The double-hinged model included 1,777,080 tetrahedral elements with 2,722,771 nodes. The von Mises stress distributions after 0.2 mm of expansion and displacement patterns after 5 mm of expansion were evaluated. Results: The highest stress accumulation was observed in the sutura zygomatico maxillaris area with all 3 appliances. An increase in stress was noted at the pterygomaxillary fissure, the medial and lateral pterygoid process of the sphenoid bone, and the nasal areas. The wedge-shaped skeletal opening was observed with all 3 appliances. In the transverse plane, maximum posterior expansion was achieved with the Hyrax appliance, whereas the maximum anterior expansion was observed with the double-hinged appliance. The maxilla moved inferiorly and anteriorly with all the 3 appliances. The greatest inferior displacement of the maxilla was recorded with the Hyrax appliance, whereas anterior maxillary displacement was the greatest with the double-hinged appliance. Conclusion: All the appliances showed similar stress distributions. The use of double-hinged screw caused a slight anterior displacement of point A. The fan-type and double-hinged appliances were shown to be more effective on anterior maxillary constriction, whereas the Hyrax appliance might be chosen for resolving maxillary posterior constriction. Competing Interests: Conflict of Interest: The authors have no conflict of interest to declare. (© Copyright 2021 by Turkish Orthodontic Society.) |
| Databáze: | MEDLINE |
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