Combined use of miniscrews and clear aligner for en-mass retraction of maxillary anterior teeth: A finite element analysis
10.3969/j.issn.1001-3733.2019.01.016
- VernacularTitle:无托槽隐形矫治器联合微种植钉整体内收上前牙的三维有限元研究
- Author:
Yu BAI
1
;
Xue FENG
;
Dongmei LIU
;
Peng LI
;
Yingli FENG
Author Information
1. 军事口腔医学国家重点实验室
- Keywords:
Clear aligner;
Micro-implant anchorage (MIA);
Three dimensional Finite element analysis (3D-FEA);
En-mass retraction;
Biomechanics
- From:
Journal of Practical Stomatology
2019;35(1):71-76
- CountryChina
- Language:Chinese
-
Abstract:
Objective: To evaluate the biomechanical effects of combined use of miniscrew and clear aligner in different kinds of loading condition on the en-mass retraction of maxillary anterior teeth. Methods: 3 D finite element models of the maxillary bone with miniscrews and clear aligner were reconstructed using the method of reverse engineering with CBCT data of an adult patient who had maxillary first premolars extracted. The orthodontic force was loaded by (1) clear aligner, (2) clear aligner and 1. 47 N force of retraction at appliance and (3) clear aligner and 1. 47 N force of retraction at canine, respectively. Results: Under the working condition of (1), (2) and (3), in sagittal direction, the displacement difference of crown and root of the maxillary central incisor was 1. 12 E-02 mm, 1. 29 E-02 mm and 9. 62 E-03 mm respectively, the displacement of the first molar crown was-2. 49 E-02 mm, -2. 09 E-02 mm and-2. 00 E-02 mm respectively; in vertical direction, extrusion of the maxillary central incisor was 1. 77 E-03 mm, 2. 93 E-03 mm and 6. 53 E-04 mm respectively. Conclusion: The working condition (3) is more advantageous to control the torque of incisors and to save the anchorage of posterior teeth, and more effective to control the extrusion of the incisors.
