Int J Stomatol

Int J Stomatol ›› 2025, Vol. 52 ›› Issue (1): 69-75.doi: 10.7518/gjkq.2025016

• Original Articles • Previous Articles     Next Articles

Movement characteristics of upper anterior teeth in clear aligner therapy with tooth extraction orthodontics with different vertical facial patterns in finite element analysis

Wangru Li(),Pu Yang()   

  1. State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases & Dept. of Orthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China
  • Received:2024-04-09 Revised:2024-08-20 Online:2025-01-01 Published:2025-01-11
  • Contact: Pu Yang E-mail:507071944@qq.com;yangpu@scu.edu.cn
  • Supported by:
    Scientific Research Project of China Oral Health Foundation(A2021-143)

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Abstract:

Objective This study aims to investigate the movement dynamics of maxillary anterior teeth during extraction and correction utilizing clear aligner therapy among patients exhibiting distinct vertical facial patterns. Methods Oral and cone beam computed tomography data of the patient’s maxillary anatomy and oral scan data of maxillary dentition were collected. By employing software such as Mimics, Geomagic Studio, and HyperMesh, three vertical facial patterns were established via a three-dimensional finite element model. This model simulated clear aligner adduction of the upper anterior teeth, facilitating analysis of movement trends, sagittal and vertical displacements, alterations in anterior tooth torque, and periodontal ligament equivalent stress. Results Across all vertical facial pattern groups, the teeth exhi-bited migration towards the extraction site, with root displacement inferior to crown displacement and concurrent oblique movement. Vertical and sagittal displacements of maxillary incisors and periodontal ligament effects demonstrated progressive increment from the brachyfacial group to the mesofacial and dolichofacial groups. Conversely, vertical and sagittal displacements of canines, periodontal ligament equiva-lent stress, and torque changes remained consistent. Notably, the dolichofacial group exhibited the highest magnitude, whereas the brachyfacial group displayed the lowest. Conclusion Clear aligner therapy with tooth extraction and correction induces a clockwise moment on the anterior teeth, intensifying sequentially across the brachyfacial, mesofacial, and dolichofacial groups.

Key words: clear aligner, tooth extraction therapy, biomechanics, vertical facial pattern, finite element analysis

CLC Number: 

  • R783

TrendMD: 

Fig 1

Construction of three-dimensional finite element modeling with different vertical facial patterns"

Tab 1

Parameters for three-dimensional finite element modeling with different vertical facial patterns （°）"

参数低角组均角组高角组
∠U1-SN102.4102.4102.4
∠OP-SN9.213.822.4
∠U1-OP68.463.855.2

Fig 2

Three-dimensional finite element models of extracted the first premolar with different vertical bone facial patterns"

Tab 2

Material parameters"

材料弹性模量（E/MPa）松柏比（v）
上颌骨24 0000.3
透明矫治器5280.36
牙周膜0.690.45
牙齿19 6000.3

Fig 3

Setting of coordinate system"

Fig 4

Direction of displacement of maxillary anterior teeth"

Tab 3

Sagittal displacement of maxillary anterior teeth with different vertical facial patterns　　　×10-2 mm"

牙齿低角组均角组高角组
牙冠牙根冠根位移差值牙冠牙根冠根位移差值牙冠牙根冠根位移差值
中切牙4.033 5L1.441 5B2.592 0L5.847 5L2.054 0B3.793 5L6.552 0L2.194 5B4.357 5L
侧切牙2.954 5L1.090 5B1.864 0L5.979 0L2.181 5B3.797 5L7.774 0L2.682 0B5.092 0L
尖牙6.715 0L2.758 0B3.957 0L9.200 0L3.838 0B5.362 0L7.461 0L3.196 0B4.265 0L

Fig 5

Contour map of displacement of maxillary anterior teeth"

Tab 4

Vertical displacement of maxillary anterior teeth with different vertical facial patterns　　　×10-2 mm"

牙齿低角组均角组高角组
牙冠牙根冠根位移差值牙冠牙根冠根位移差值牙冠牙根冠根位移差值
中切牙1.275 0E0.571 6I0.703 4E2.190 0E1.012 0I1.178 0E3.445 0E1.128 0I2.317 0E
侧切牙0.908 0E0.343 3I0.564 7E2.207 0E0.944 4I1.263 0E4.360 0E1.910 0I2.450 0E
尖牙1.432 0E2.727 0I1.295 0I1.608 0E3.732 0I2.124 0I1.300 0E2.870 0I1.569 0I

Tab 5

Changes of torque for maxillary anterior teeth of different vertical facial patterns"

牙齿低角组均角组高角组
中切牙7.014 610.901 512.402 4
侧切牙5.331 610.813 614 371 2
尖牙9.122 512 470 410.498 2

Fig 6

Periodontal membrane equivalent force diagram"

Tab 6

Maximum periodontal stress values of maxillary anterior teeth with different vertical facial patterns"

牙齿低角组均角组高角组
中切牙1.3251.7341.842
侧切牙1.9012.0022.192
尖牙2.1233.3242.746
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