Periodontal anaesthesia reduces common 8 Hz input to masseters during isometric biting.

Abstract:

:During isometric contractions of the jaw muscles, oscillations in the rectified masseteric EMG record that are coherent with the mandibular force output are evident at ~8 Hz. We have investigated the load dependence of these oscillations under both force and EMG feedback conditions and the extent to which these oscillations are coupled bilaterally in the jaw muscles. We further investigated the extent to which afferent information arising from the periodontium during biting influenced the extent of ~8 Hz EMG tremor and the bilateral coupling between masseters at this frequency. Using coherence analysis we have shown that a significant load-independent coupling of EMG between the closing muscles of the jaw occurs at ~8 Hz as a result of common ~8 Hz input to the masseters. This common input is significantly reduced when afferent information from the periodontium is blocked. These results suggest that afferent information arising from the periodontium enhances the expression of peripheral tremulous activity, which may be important for optimising the response of the jaw to changes in forces occurring between the teeth.

journal_name

Exp Brain Res

authors

Sowman PF,Brinkworth RS,Türker KS

doi

10.1007/s00221-005-0144-5

keywords:

subject

Has Abstract

pub_date

2006-03-01 00:00:00

pages

326-37

issue

3

eissn

0014-4819

issn

1432-1106

journal_volume

169

pub_type

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