E-ISSN 2148-9505
Original Article
Dentofacial Effects of Fixed Functional Appliances with or without Mini Screw Anchorage in the Treatment of Class II Division I Malocclusion: A Finite Element Analysis
1 Department of Orthodontics, Cumhuriyet University School of Dentistry, Sivas, Turkey  
Turk J Orthod 2018; 31: 7-12
DOI: 10.5152/TurkJOrthod.2018.17026
Key Words: Functional treatment, miniscrew, finite element analysis


Objective: This study aimed to examine the biomechanical effects of the fixed functional appliances reinforced with miniscrews by finite elements analysis over the cranial and facial bones, temporomandibular joint, and maxillary-mandibular teeth, which are used for the treatment of Class II division 1 malocclusions characterized as mandibular retrognathia.


Methods: Three-dimensional (3-D) models of the cranial, mandibular, and maxillary bones were purchased from a company that produces 3-D models of the bones. Simulations of Forsus, screwed Forsus, Twin-Force and screwed Twin-Force appliances were conducted on the 3 D models. The miniscrew was placed in the inter-radicular area between the upper canine and first upper premolar teeth.


Results: It was observed in the models that the first upper molar tooth was the most affected. The compressive stress was observed in the anterior area of the mandibular condyle neck in the Forsus appliances; however, it was observed in the posterior area of the mandibular condyle neck in Twin-Force appliances.


Conclusion: It was observed that molar distalization and expansion decreases in the functional appliances with the support of miniscrew. The highest tension rates were determined in the areas of condylar and articular discs.


Cite this article as: Akış H, Doruk C. Dentofacial Effects of Miniscrewed and Non-Miniscrewed Fixed Functional Appliances on the Treatment of Class II Division 1 Malocclusion: A Finite Element Analysis. Turk J Orthod 2018; 31: 7-12.

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