Influence of different ligation methods on force and moment generation in a simulated condition of the maxillary crowded anterior dentition with linguo-version and rotation

Article type: Research Article

Authors: Kim, Sunmin^a | Yonemitsu, Ikuo^a; | Takemura, Hiroshi^b | Shimoda, Kunio^b | Suga, Kazuhiro^c | Soga, Kohei^d | Ono, Takashi^a | Uo, Motohiro^e

Affiliations: [a] Department of Orthodontic Science, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan | [b] Department of Mechanical Engineering, Faculty of Science and Technology, Tokyo University of Science, Chiba, Japan | [c] Department of Mechanical Engineering, Faculty of Engineering, Kogakuin University, Tokyo, Japan | [d] Department of Materials Science and Technology, Faculty of Industrial Science and Technology, Tokyo University of Science, Tokyo, Japan | [e] Department of Advanced Biomaterials, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan

Correspondence: [*] Corresponding author: Ikuo Yonemitsu, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan. Tel.: +81 3 5803 5530; Fax: +81 3 5803 5530; E-mail: yoneman.orts@tmd.ac.jp

Abstract: BACKGROUND:Most orthodontic cases consist of varying degrees of crowding. To manage crowded dentitions, nickel-titanium archwires with various ligation methods are often used. OBJECTIVE:We aimed to investigate the effect of different ligation methods with respect to force and moment and suggest the efficient ligation method for treating rotation and displacement simultaneously. METHODS:We built a model that simulated the three anterior teeth of the maxilla. The teeth on the two ends were fixed, and the middle tooth was set in several different positions by manipulating the amount of displacement in bucco-lingual direction and rotation angle. The measurements were taken with three different ligation methods of self-ligation (SL), elastomeric o-ring ligation on both side wings (EB), and on one side wings (EO). RESULTS:The magnitude of linguo-buccal force exceeded the standard optimal force in each condition examined and was significantly larger in EB than in other ligation methods. Moreover, the magnitude of moment generation with SL was suitable in the 0.0 mm linguo-version, whereas it was suitable with EO in the linguo-version ranging 1.0–3.0 mm. CONCLUSIONS:The ligation method significantly affected the force and moment. SL and EO are recommended in dentitions with light and deep lingual displacements, respectively.

Keywords: Six-axis sensor, orthodontics, force system, moment, orthodontic simulator

DOI: 10.3233/BME-211288

Journal: Bio-Medical Materials and Engineering, vol. 33, no. 6, pp. 453-463, 2022