Clinical evaluation on maxillary protraction combined with rapid maxillary expansion and constriction in treating Class Ⅲ malocclusion in early permanent dentition by Pitchfork analysis

doi:10.3877/cma.j.issn.1674-1366.2014.05.010

Abstract

Abstract:

Objective

To evaluate the skeletal and dental contribution rate to the treatment effects of maxillary protraction combined with rapid maxillary expansion and constriction on patients with ClassⅢmalocclusion in early permanent dentition.

Methods

Ten ClassⅢpatients in early permanent dentition were observed for 6 months and then treated by maxillary protraction combined with rapid maxillary expansion and constriction for another 6 months. Pitchfork analysis was performed to evaluate the skeletal and dental changes between these two periods.

Results

The treatment made 7.2 mm （t=6.85，P＜0.05） molar correction in general， which included 4.4 mm skeletal change and 2.8 mm dental change. Within the skeletal change， the contribution ratio of upper and lower jaw was about 1 ∶3.Within the dental change， the contribution ratio of upper and lower molar was about 2 ∶3.

Conclusion

This study demonstrated that maxillary protraction combined with rapid maxillary expansion and constriction therapy could produce great occlusion improvement for the Class Ⅲ patients in early permanent dentition.

Key words: Early permanent dentition, Angle Class Ⅲ, Rapid maxillary expansion and constriction, Maxillary protraction, Pitchfork analysis

Xingui Li, Dongjie Zhang, Jinmei Ye, Liqin Deng, Jiayu Zhai, Ke Chen. Clinical evaluation on maxillary protraction combined with rapid maxillary expansion and constriction in treating Class Ⅲ malocclusion in early permanent dentition by Pitchfork analysis[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2014, 8(05): 401-407.

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Figures/Tables 28

References 13

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头影测量项目	对照组变化	治疗组变化	差值	t值	P值
Mx（mm）	0.09±0.34	1.21±0.51	1.12±0.46	1.52	0.184
Md（mm）	-0.77±0.32	2.52±0.72	3.29±0.57	5.11	0.001^a
ABCH（mm）	-0.68±0.30	3.73±1.02	4.41±0.81	5.36	0.000^a
U6（mm）	0.92±0.37	2.02±0.77	1.10±0.52	2.38	0.052
L6（mm）	-0.41±0.45	1.29±0.57	1.70±0.56	2.55	0.041^a
U1（mm）	0.79±0.21	2.07±1.50	1.28±0.74	2.47	0.048^a
L1（mm）	-0.41±0.52	-2.82±1.21	-2.41±0.83	1.74	0.123
6/6（mm）	-0.17±0.43	7.04±0.62	7.21±0.54	6.85	0.000^a
1/1（mm）	-0.20±0.18	2.98±1.08	3.18±0.72	5.27	0.000^a

头影测量项目	对照组变化	治疗组变化	差值	t值	P值
Mx（mm）	0.09±0.34	1.21±0.51	1.12±0.46	1.52	0.184
Md（mm）	-0.77±0.32	2.52±0.72	3.29±0.57	5.11	0.001^a
ABCH（mm）	-0.68±0.30	3.73±1.02	4.41±0.81	5.36	0.000^a
U6（mm）	0.92±0.37	2.02±0.77	1.10±0.52	2.38	0.052
L6（mm）	-0.41±0.45	1.29±0.57	1.70±0.56	2.55	0.041^a
U1（mm）	0.79±0.21	2.07±1.50	1.28±0.74	2.47	0.048^a
L1（mm）	-0.41±0.52	-2.82±1.21	-2.41±0.83	1.74	0.123
6/6（mm）	-0.17±0.43	7.04±0.62	7.21±0.54	6.85	0.000^a
1/1（mm）	-0.20±0.18	2.98±1.08	3.18±0.72	5.27	0.000^a

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[3]	Lin-yu XU, Duan-qiang ZHANG, Hui-qin XU, Xiong-wen QIU. Effect of face mask maxillary protraction on maxilla and mandibula mental region in class Ⅲ malocclusion [J]. Chinese Journal of Stomatological Research(Electronic Edition), 2007, 01(02): 105-108.

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