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Abstract
This study aims to analyse the stress distributions and initial displacements of teeth during the space closing stage through a three-dimensional finite element method. Computed tomography images of a patient were used to reconstruct the detailed teeth and alveolar bone, and brackets with stainless steel archwire were modelled according to the orthodontic prescriptions. The second premolars and first molars were chosen as the anchorages in the model 6-force, with buccal tubes attached to the second molars in the model 6-force-7, and the second molars as additional anchorages in the model 7-force. The results indicated that a movement of lingual lateral inclination occurred on the incisors during the retraction, and the frictional force between the teeth and the archwire significantly reduced the stress on the teeth and periodontal structures.

Malocclusion is one of the most common issue in dentistry with high prevalence and orthodontic treatment need. The extraction of first premolar teeth was normally needed at the beginning of the treatment. And the straight wire appliance together with the sliding mechanics was used for space closure at the end of the treatment. However, side effects like root resorption also found after the surgery. Biomechanically, the stress distributions and initial displacements of teeth during space closing stage might be a crucial factor contributed to those undesirable side effects. And different selections of anchorages might alter the biomechanical environment during the treatment. Thus, the purpose of the current study was to analyse the stress distributions and initial displacements, with the different anchorage selections, of teeth during space closing stage through 3D finite element method.
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Funding
This work was supported by the National Natural Science Foundation of China [grant number 31670963 and 11421202].
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Key Lab for Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu, China
Zhan Liu & Tinghui Sun
School of Biological Science and Medical Engineering, Beijing Advanced Innovation Centre for Biomedical Engineering, Beihang University, Beijing, China
Yubo Fan
Beijing Key Laboratory of Rehabilitation Engineering for Elderly, National Research Center for Rehabilitation Technical Aids, Beijing, China
Yubo Fan
Yubo Fan, School of Biological Science and Medical Engineering, Beihang University, Beijing, China
Yubo Fan
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Liu, Z., Sun, T. & Fan, Y. Biomechanical influence of anchorages on orthodontic space closing mechanics by sliding method.Med Biol Eng Comput58, 1091–1097 (2020). https://doi.org/10.1007/s11517-020-02149-1
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