Author:
Hamanaka Ryo,Cantarella Daniele,Lombardo Luca,Karanxha Lorena,Del Fabbro Massimo,Siciliani Giuseppe,Yoshida Noriaki
Abstract
Abstract
Background
The aim of this study is to compare the biomechanical effects of the conventional 0.019 × 0.025-in stainless steel archwire with the dual-section archwire when en-masse retraction is performed with sliding mechanics and skeletal anchorage.
Methods
Models of maxillary dentition equipped with the 0.019 × 0.025-in archwire and the dual-section archwire, whose anterior portion is 0.021 × 0.025-in and posterior portion is 0.018 × 0.025-in were constructed. Then, long-term tooth movement during en-masse retraction was simulated using the finite element method. Power arms of 8, 10, 12 and 14 mm length were employed to control anterior torque, and retraction forces of 2 N were applied with a direct skeletal anchorage.
Results
For achieving bodily movement of the incisors, power arms longer than 14 mm were required for the 0.019 × 0.025-in archwire, while between 8 and 10 mm for the dual-section archwire. The longer the power arms, the greater the counter-clockwise rotation of the occlusal plane was produced. Frictional resistance generated between the archwire and brackets and tubes on the posterior teeth was smaller than 5% of the retraction force of 2 N.
Conclusions
The use of dual-section archwire might bring some biomechanical advantages as it allows to apply retraction force at a considerable lower height, and with a reduced occlusal plane rotation, compared to the conventional archwire. Clinical studies are needed to confirm the present results.
Publisher
Springer Science and Business Media LLC
Reference17 articles.
1. Jung M, Kim T. Biomechanical considerations in treatment with miniscrew anchorage. Part 1: the sagittal plane. J Clin Orthod. 2008;42:79–83.
2. Nanda R, Ghosh J. Biomechanical considerations in sliding mechanics. Philadelphia: WB Saunders; 1997.
3. Gjessing P. Controlled retraction of maxillary incisors. Am J Orthod Dentofac Orthop. 1992;101:120–31.
4. Ziegler P, Ingervall B. A clinical study of maxillary canine retraction with a retraction spring and with sliding mechanics. Am J Orthod Dentofac Orthop. 1989;95:99–106.
5. Carano A, Velo S, Leone P, Siciliani G. Clinical applications of the miniscrew anchorage system. J Clin Orthod. 2005;39:9–24.
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