Three-dimensional finite element analysis of upper anterior teeth retraction and intrusion using clear aligners and mini-implants

doi:10.7518/hxkq.2022.05.013

Abstract

Abstract:

Objective This study aimed to investigate the differences in treatment outcomes of upper anterior teeth retraction and intrusion with clear aligners and different types of elastics on mini-implants via the 3D finite element method. Methods Cone-beam computed tomography (CBCT) was conducted to construct a 3D finite element model of maxillary bone, dentition, and clear aligners using Mimics, Geomagic, Solidworks, and Ansys. Four model groups were developed. Group 1 was the control group. Group 2 implanted a mini-implant between the upper second premolar and the upper first molar with a force of 0.98 N applied to the canine cut along the retracting direction for each side. Group 3 was based on Group 2, which implanted an additional mini-implant between the upper central incisors with a force of 0.98 N applied to the upper anterior teeth cuts. Group 4 was also based on Group 2, which implanted 2 additional mini-implants between the upper central and lateral incisors with a force of 0.56 N applied to the upper anterior teeth cuts for both sides. Anterior teeth torque changes, displacement patterns, and stress distributions were analyzed. Results Among all the experimental groups, the anterior teeth demonstrated intrusion and distal inclination, accompanied with varied degrees of torque loss. In Group 3, the maxillary and lateral incisors had the smallest sagittal coronal displacement. In Group 4, the intrusion values of the maxillary and lateral incisors were the largest among all the experimental groups. The maximum stress concentration in Group 2 was the most significant among all the experimental groups. Conclusion Implanting the mini-implant between the central incisors for traction is conducive to torque control. By contrast, implanting the mini-implants between the central incisors and lateral incisors combined with vertical traction is conducive to simple intrusion, avoiding the “bowing effect” to a certain extent.

Key words: three-dimensional finite element, retraction, intrusion of upper anterior teeth, mini-implant, clear aligner

CLC Number:

R 783.5

Shi Zean, Xia Kai, Luo Liangyu, Zhao Zhihe, Liu Jun.. Three-dimensional finite element analysis of upper anterior teeth retraction and intrusion using clear aligners and mini-implants[J]. West China Journal of Stomatology, 2022, 40(5): 589-596.

Figures/Tables 7

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参数	杨氏模量/MPa	泊松比
牙槽骨	1 370	0.3
牙齿	18 600	0.3
牙周膜	0.87	0.35
隐形矫治器	528	0.36
附件	12 500	0.36

牙齿	第1组		第2组		第3组		第4组
牙齿	牙冠	牙根	牙冠	牙根	牙冠	牙根	牙冠	牙根
中切牙	4.97	4.23	5.46	4.32	6.89	4.89	7.17	6.57
侧切牙	1.99	1.23	2.86	2.15	3.39	2.82	3.99	3.12
尖牙	-1.42	-0.93	2.58	2.80	3.06	2.03	2.99	3.19

组别	中切牙			侧切牙
组别	牙冠	牙根	冠根位移差	牙冠	牙根	冠根位移差
第1组	1.32×10^-2	-5.17×10^-3	1.84×10^-2	1.05×10^-2	-4.92×10^-3	1.54×10^-2
第2组	1.37×10^-2	-5.29×10^-3	1.90×10^-2	1.16×10^-2	-5.29×10^-3	1.70×10^-2
第3组	4.20×10^-3	-2.14×10^-3	6.34×10^-3	5.68×10^-3	-2.12×10^-3	7.79×10^-3
第4组	7.11×10^-3	-3.11×10^-3	1.02×10^-2	7.07×10^-3	-2.84×10^-3	9.91×10^-3

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