The study of temporomandibular joint sounds and corresponding mandible position in youth with individual normal occlusion

doi:10.3877/cma.j.issn.1674-1366.2010.02.004

Abstract

Abstract:

Objective

To analyze the characteristics of temporomandibular joint （TMJ）sounds an d the corresponding mandibular position in young subjects with individual normal occlusion.

Methods

26 young healthy volunteers with individual normal occlusion from Guanghua School of Stomatology were included. The TMJ sounds and the mandibular positions of subjects were recorded with BioPAK （BioJVA and BioEGN） system by means of electrovibratograghy and electrognathography respectively.

Results

The inter-quartile range of the amplitude of TMJ sounds was between 0.40 ～1.08 Pa. The inter-quartile range of the frequency of TMJ sounds was between 48 ～91 Hz. No significant difference was found between bilateral TMJs for neither the amplitude nor the frequency of TMJ sounds. The mandibular position （indicated by mandibular incisors' tracing path in sagittal plane） was in the 74% ± 15% portion of maximal displacement from ICP in the mandibular opening path when the normal TMJ sounds appeared.

Conclusions

In youth with individual normal occlusion， the amplitude and frequency of TMJ sounds follows a skewed distribution. The mandibular position is in the middle or lower portion of the mandibular opening path when TMJ sounds appear.

Key words: Individual normal occlusion, Temporomandibular joint sounds, Mandibular position

Xue-feng LIN, Xia-yi WU. The study of temporomandibular joint sounds and corresponding mandible position in youth with individual normal occlusion[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2010, 4(02): 126-132.

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Figures/Tables 6

References 28

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颞下颌关节音	Q_L	M	Q_U	Q
左侧	0.40	0.55	0.98	0.58
右侧	0.40	0.65	1.13	0.73
双侧	0.40	0.60	1.08	0.68

颞下颌关节音	Q_L	M	Q_U	Q
左侧	0.40	0.55	0.98	0.58
右侧	0.40	0.65	1.13	0.73
双侧	0.40	0.60	1.08	0.68

频率	Q_L	M	Q_U	Q
左侧	51.0	64.0	103.0	52.0
右侧	43.3	62.0	91.0	47.8
双侧	48.0	64.0	91.0	43.0

频率	Q_L	M	Q_U	Q
左侧	51.0	64.0	103.0	52.0
右侧	43.3	62.0	91.0	47.8
双侧	48.0	64.0	91.0	43.0

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