不同拔牙方式对骨性Ⅱ类错牙合畸形Bolton指数及咬合关系的影响

doi:10.13591/j.cnki.kqyx.2024.05.003

Abstract

Abstract:

Objective To investigate the effect of different premolar extraction patterns on Bolton index and occlusal relationship of skeletal Class Ⅱ malocclusion. Methods The plaster models of 62 patients with skeletal Class Ⅱ malocclusion were selected and converted into digital models by iTeroElement scanner. Each model was simulated by the four premolar extraction pattrens, and tooth arrangement test was performed after tooth extraction. The Bolton index before and after tooth extraction was calculated, and the occlusal relationship after tooth arrangement was evaluated to explore its law. Results All the four premolar extraction patterns resulted in a significant decrease in the Bolton index over-all ratio in skeletal Class Ⅱ patients, and compared with the extraction patterns of 4/4 and 4/5, the patterns of 5/4 and 5/5 resulted in a greater decrease in the Bolton index over-all ratio(P<0.001). For skeletal class Ⅱ malocclusion, the tooth arrangement test was conducted on the basis of establishing the neutral relationship of first molar. The average value of anterior teeth over-jet obtained by patterns of 4/4 and 4/5 was within the normal range(<3 mm). The average value obtained by patterns of 5/4 and 5/5 was greater than the normal range(>3 mm), and the difference was statistically significant(P<0.001). Conclusion The premolar extraction patterns of 4/4 and 4/5 are more conducive to normalizing the Bolton index over-all ratio and establishing the better occlusal relationship for skeletal Class Ⅱ malocclusion.

Key words: orthodontics, skeletal Class Ⅱ malocclusion, orthodontic extraction treatment, Bolton index, tooth arrangement test

CLC Number:

R783.5

SONG Ye, REN Yinting, ZHANG Yihan, HAN Jingying. The effect of different tooth extraction patterns on Bolton index and occlusal relationship of skeletal Class Ⅱ malocclusion[J]. Stomatology, 2024, 44(5): 334-337.

Figures/Tables 6

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References 25

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测量项目	正常牙合	骨性Ⅱ类	t	P
Bolton指数前牙比	78.80±1.72	77.81±1.94	-4.009	0.000
Bolton指数全牙比	91.50±1.51	90.37±1.48	-6.020	0.000

组别	A组	B组	C组	D组
拔牙前	90.37±1.48	90.37±1.48	90.37±1.48	90.37±1.48
拔牙后	89.08±1.48	89.03±1.55	87.94±1.53	87.89±1.54
差值^*	1.29±0.48	1.34±0.61	2.43±0.53	2.48±0.52
t	21.306	17.272	36.087	37.313
P	0.000	0.000	0.000	0.000

比较的组别	差值/%	P
A组-B组	0.05±0.50	0.851
A组-C组	1.13±0.54	0.000
A组-D组	1.19±0.62	0.000
B组-C组	1.08±0.83	0.000
B组-D组	1.13±0.55	0.000
C组-D组	0.05±0.49	0.852

比较的组别	差值/mm	P
A组-B组	-0.09±0.24	0.531
A组-C组	-0.58±0.33	0.000
A组-D组	-0.70±0.34	0.000
B组-C组	-0.49±0.40	0.001
B组-D组	-0.61±0.33	0.000
C组-D组	-0.13±0.32	0.377

The effect of different tooth extraction patterns on Bolton index and occlusal relationship of skeletal Class Ⅱ malocclusion

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