Masseter muscle thickness changes with twin-block appliance in children with class II division 1 malocclusion and mandibular retrusion

doi:10.3877/cma.j.issn.1674-1366.2008-01-013

Abstract

Abstract:

Objectives

To evaluate the change of thickness of masseter muscle （MM） before and after treatment with Twin-block （TB） appliance in children with Class Ⅱdivision 1 malocclusion and mandibular retrusion.

Methods

Fifteen children with Class Ⅱmalocclusion and retruded mandible were selected and divided into the TB treatment group and the control group. By using ultrasonography， the thickness of bilateral masseter muscles was measured at mandibular postural position （MPP） and at maximal voluntary clenching position （MCP） after 0，1，3，6 months for both groups respectively. Statistical analysis was performed to compare the means of the corresponding parameters and the AILCSD （asymmetry index of local cross-sectional dimension） of masseter muscles between groups， as well as the parameters among 0，1，3，6 months in each group.

Results

①MM thickness at MPP and MCP during the treatment decreased first and then increased with statistical significance； ②AILCSD of MM decreased significantly and compensated the imbalance of MM.

Conclusions

TB appliance is a muscular training device to eliminate the muscular abnormal function and disadvantage of malocclusion， which improves the coordination of the oral-maxillofacial muscles.

Key words: Ultrasonography, Masseter muscle thickness, Retruded mandible, Twin-block appliance

Xun MA, Da-wei WANG, Bin CAI, Xi LIN, Shuang-lin ZHU, Yang WANG. Masseter muscle thickness changes with twin-block appliance in children with class II division 1 malocclusion and mandibular retrusion[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2008, 02(01): 67-74.

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Figures/Tables 15

References 15

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	MM_a		MM_max
	MPP	MCP	MMP	MCP
对照组	9.3±2.5	10.8±2.0	9.5±2.4	11.6±2.5
试验组（不戴TB）	8.7±2.3	9.4±2.7	10.2±2.1	10.6±2.4
P	0.45	0.13	0.39	0.27

	MM_a		MM_max
	MPP	MCP	MMP	MCP
对照组	9.3±2.5	10.8±2.0	9.5±2.4	11.6±2.5
试验组（不戴TB）	8.7±2.3	9.4±2.7	10.2±2.1	10.6±2.4
P	0.45	0.13	0.39	0.27

	MM_a					MM_max
	0个月	1个月	3个月	6个月	P	0个月	1个月	3个月	6个月	P
对照组	9.3±2.5	9.2±1.9	9.6±2.2	10.2±2.3	0.64	9.5±2.4	9.6±2.6	9.8±1.8	10.7±2.0	0.51
试验组（不戴TB）	8.7±2.3	6.8±2.1	6.9±2.4	8.5±2.0	0.04	10.2±2.1	9.7±2.5	9.8±2.2	10.9±2.3	0.43
P		＜0.05	＜0.05

	MM_a					MM_max
	0个月	1个月	3个月	6个月	P	0个月	1个月	3个月	6个月	P
对照组	9.3±2.5	9.2±1.9	9.6±2.2	10.2±2.3	0.64	9.5±2.4	9.6±2.6	9.8±1.8	10.7±2.0	0.51
试验组（不戴TB）	8.7±2.3	6.8±2.1	6.9±2.4	8.5±2.0	0.04	10.2±2.1	9.7±2.5	9.8±2.2	10.9±2.3	0.43
P		＜0.05	＜0.05

	MM_a				P	MM_max				P
	0个月	1个月	3个月	6个月	P	0个月	1个月	3个月	6个月	P
对照组	10.8±2.0	10.5±2.4	11.6±2.1	11.8±2.3	0.36	11.6±2.5	11.9±2.3	12.1±1.9	12.5±2.1	0.52
试验组（不戴TB）	9.4±2.2	8.0±1.9	8.9±2.4	10.9±1.7	0.02	10.6±2.4	8.3±1.8	9.9±2.2	11.5±2.1	0.03
P		＜0.05	＜0.05				＜0.05

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