扩弓器种类及位置对双侧完全性唇腭裂扩弓生物力学影响的有限元分析

doi:10.13591/j.cnki.kqyx.2025.11.011

Abstract

Abstract:

Objective To investigate the different biomechanical effects of two types of palatal expanders and expansion sites on a bilateral complete cleft lip and palate (BCCLP) in mixed dentition with a finite element analysis (FEA). Methods The CBCT data of a patient with BCCLP were collected to construct a FEA model containing craniomaxillary suture structure. The fan-shaped and traditional Hyrax expanders were drawn and assembled into the FEA model in SolidWorks software according to the working conditions as follows: condition 1 and 2, the fan-shaped expander was placed at the anterior/posterior part of the palate respectively;condition 3 and 4, the Hyrax expander was placed at the anterior/posterior part of the palate respectively. A 5 N force in X axis direction was loaded at the apex of the expander coil spring. The stress distribution and initial displacement of craniomaxillary complex in four working conditions were compared. Results ①In working condition 1, 2 and 3, the displacement of anterior part was larger than the posterior part of the dental arch. Under condition 4, the displacement of anterior, middle and posterior parts of dental arch were basically the same. ②The maximum stress and displacement were observed at crowns in all working conditions. ③There was a certain skeletal enlargement effect, which showed a gradually decreasing deformation trend from alveolar region to the upward region. Conclusion The expansion effect of fan-shaped expander is more suitable for BCCLP patients with extremely narrow anterior arch and normal posterior arch. For the traditional Hyrax expander, the position has a great influence on expansion effect. It is showed that the dental support expander could produce skeletal dilation effect in BCCLP patients during mixed dentition.

Key words: finite element analysis, palatal expansion, bilateral complete cleft lip and palate, fan-shaped expander, Hyrax expander

CLC Number:

R783.5

YAO Pinyi, WANG Hongyang, WANG Mingyue, ZHANG Hongchuang. A finite element analysis of bilateral complete cleft lip and palate during expansion with variable types and locations of the expander[J]. Stomatology, 2025, 45(11): 858-864.

Figures/Tables 7

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References 34

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材料	杨氏模量/MPa	泊松比
松质骨	8.00×10³	0.30
密质骨	1.36×10⁴	0.30
骨缝	10.00	0.49
牙	2.07×10⁴	0.30
牙周膜	0.49	0.45
不锈钢装置	2.14×10⁵	0.30

观测点		总位移				X轴方向位移绝对值				Y轴方向位移绝对值				Z轴方向位移绝对值
观测点		工况1	工况2	工况3	工况4	工况1	工况2	工况3	工况4	工况1	工况2	工况3	工况4	工况1	工况2	工况3	工况4
牙弓	DC	2.41	2.04	3.15	3.41	2.37	2.01	2.75	3.15	0.31	0.26	1.31	0.86	0.31	0.23	0.80	0.98
	FP	2.15	1.79	2.71	3.44	2.11	1.72	2.69	3.19	0.24	0.31	0.25	0.87	0.34	0.39	0.21	0.95
	DM	2.04	1.65	2.65	3.47	1.96	1.62	2.61	3.22	0.35	0.21	0.16	0.91	0.44	0.23	0.43	0.91
	PM	1.44	1.24	2.16	3.52	1.38	1.18	2.10	3.18	0.35	0.24	0.28	0.96	0.22	0.30	0.42	1.16
牙槽	DCB	2.01	1.98	3.05	3.11	1.92	1.89	2.68	2.99	0.35	0.27	1.11	0.59	0.48	0.52	0.94	0.62
	DCL	2.08	2.01	3.11	3.16	2.04	1.93	2.73	2.86	0.30	0.31	0.89	0.72	0.27	0.47	1.19	1.13
	FPB	2.08	1.70	2.64	3.18	1.90	1.67	2.34	2.79	0.54	0.26	0.69	0.94	0.65	0.18	1.01	1.20
	FPL	2.09	1.73	2.67	3.19	1.96	1.65	2.41	2.83	0.58	0.31	0.58	0.91	0.44	0.41	0.99	1.16
	DMB	1.93	1.58	2.23	3.17	1.85	1.49	2.12	2.84	0.27	0.33	0.54	0.86	0.48	0.41	0.43	1.12
	DML	1.98	1.60	2.25	3.18	1.89	1.58	2.18	2.71	0.38	0.22	0.28	1.11	0.45	0.12	0.48	1.24
	PMB	1.35	1.16	2.08	2.94	1.26	1.14	2.01	2.78	0.31	0.18	0.22	0.48	0.37	0.12	0.49	0.83
	PML	1.39	1.21	2.11	2.97	1.34	1.16	1.86	2.78	0.25	0.26	0.56	0.37	0.27	0.22	0.82	0.98

A finite element analysis of bilateral complete cleft lip and palate during expansion with variable types and locations of the expander

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