Measurement of orthodontic forces exerted on the upper right central incisor with the increase of the distance of tooth movement and thickness of the aligner
10.3760/cma.j.issn.1002-0098.2014.03.011
- VernacularTitle:无托槽隐形矫治器厚度和唇向移位量对矫治力的影响初探
- Author:
Chaochao REN
1
;
Xiaowei LI
;
Zheyao WANG
;
Hongmei WANG
;
Yuxing BAI
Author Information
1. 100050,首都医科大学口腔医学院正畸科
- Keywords:
Orthodontic appliance design;
Tooth movement;
Aligner
- From:
Chinese Journal of Stomatology
2014;49(3):177-179
- CountryChina
- Language:Chinese
-
Abstract:
Objective To measure the orthodontic forces exerted on the upper right central incisor with the increase of the distance of tooth movement and the thickness of the aligner.Methods The labial movement of upper right central incisor at various distances (0.3,0.6,0.9,1.2,1.5,1.8 mm) was designed and the stereolithography model (2 times bigger than the original model) was created with 3-D scanning and tomography output.These models were used to fabricate the aligners with different thicknesses (0.8,1.0,1.5 and 2.0 mm) of the thermoplastic materials (6 samples for various distances of tooth movement and thicknesses).Orthodontic forces exerted on the upper right central incisor were measured with the micro-stress sensor measurement system.Results The orthodontic forces increased with the increase of the thickness of the aligner at the same distance of tooth movement (P ＜ 0.05).The orthodontic force was (1.237 ± 0.082),(1.543 ± 0.059),(3.602 ± 0.102),(6.734 ± 0.063) N when the labial movement of upper right central incisor was 0.3 mm with the aligner of 0.8,1.0,1.5,2.0 mm.The orthodontic forces also increased with the increase of the distance of the tooth movement at the same thickness of the aligner (P ＜ 0.05).The orthodontic force of the aligner of 0.8 mm were (1.354 ± 0.039),(1.288 ± 0.037),(1.479 ± 0.031),(1.799 ± 0.039) N when the upper right central tooth labial movement at 0.6,0.9,1.2,1.5 mm.Conclusions The orthodontic forces increased with the increase of the distance of tooth movement and the thickness of the aligner.
