Effect of miniscrew placement height on the distribution of biological forces produced by clear aligner for man-dibular molar distalization
10.12016/j.issn.2096-1456.2024.03.004
- VernacularTitle:种植钉植入高度对隐形矫治远移下磨牙时应力分布的影响
- Author:
Songqing WANG
1
;
Fujia KANG
;
Jiamin YUAN
;
Xianchun ZHU
Author Information
1. 吉林大学口腔医院正畸科,吉林长春(130000)
- Keywords:
mandible;
malocclusion;
orthodontics;
clear aligner;
anchorage;
miniscrew implant;
dental stress analysis;
finite element analysis
- From:
Journal of Prevention and Treatment for Stomatological Diseases
2024;(3):188-195
- CountryChina
- Language:Chinese
-
Abstract:
Objective To explore the effect of different miniscrew placement heights on the distribution of biologi-cal forces produced by clear aligner combined with intramaxillary traction for mandibular molar distalization,to identify the miniscrew location that is conducive to the protection of lower anterior tooth anchorage and to provide a reference that can be used when designing clinical treatments.Methods Mimics,GeomagicStudio 2017,SolidWorks 2016,and Ansys workbench were used to establish finite element analysis models and perform mechanical analysis under the fol-lowing six working conditions:working condition 1 was the control group without miniscrews;working conditions 2 to 5 had miniscrew in the buccal bone cortex between the first and second molars of the lower jaw 10 mm,7 mm,4 mm,and 1 mm from the top of the alveolar crest,respectively;working condition 6 had the miniscrew in the center of the buccal tongue at the anterior edge of the ascending branch of the lower jaw 5 mm above the occlusal plane.Results On the sagittal axis,miniscrew anchorage caused distal displacement of all teeth.Compared to the control group,in the miniscrew group,the displacement of the anterior molars exceeded that of the second molars.On the vertical axis,the result in the control group was similar to backward bending;the results in the miniscrew groups resembled the effect of a lever,lowering the lateral incisors and canines and raising the central incisors and first premolars.On the coronal ax-is,the second premolars and the first molars showed lingual displacement in the control group,and only the premolars and first molars showed lingual displacementin the miniscrew groups.The canines were the teeth that were most strong-ly affected by the change in miniscrew placement height.Conclusion The higher the miniscrew position is,the stron-ger the protective effect on the anterior anchorage.According to the miniscrew placement height,the mandibular arch should be properly narrowed,the central incisors and first premolars should be lowered,and the lateral incisors and ca-nines should be raised when designing clinical treatments.
