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Titolo:
The study of jaw reflexes evoked by electrical stimulation of the lip: theimportance of stimulus intensity and polarity
Autore:
Okdeh, AM; Lyons, MF; Cadden, SW;
Indirizzi:
Univ Glasgow, Sch Dent, Glasgow G12 8QQ, Lanark, Scotland Univ Glasgow Glasgow Lanark Scotland G12 8QQ ow G12 8QQ, Lanark, Scotland Univ Dundee, Sch Dent, Dundee DD1 4HN, Scotland Univ Dundee Dundee Scotland DD1 4HN , Sch Dent, Dundee DD1 4HN, Scotland
Titolo Testata:
JOURNAL OF ORAL REHABILITATION
fascicolo: 6, volume: 26, anno: 1999,
pagine: 479 - 487
SICI:
0305-182X(199906)26:6<479:TSOJRE>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN MASSETER MUSCLE; ORAL MUCOUS-MEMBRANE; EXTEROCEPTIVE SUPPRESSION; CLOSING MUSCLES; EMG COMPLEX; MECHANORECEPTORS; RESPONSES; PERIODS; TOOTH; SITES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Lyons, MF Glasgow Dent Hosp & Sch, Unit Removable Prostodont, 378 Sauchiehall St, Glasgow G2 3JZ, Lanark, Scotland Glasgow Dent Hosp & Sch 378 Sauchiehall St Glasgow Lanark Scotland G2 3JZ
Citazione:
A.M. Okdeh et al., "The study of jaw reflexes evoked by electrical stimulation of the lip: theimportance of stimulus intensity and polarity", J ORAL REH, 26(6), 1999, pp. 479-487

Abstract

The aim of this study was to investigate whether reported differences in the patterns of jaw reflexes which can be evoked by electrical stimulation of the lip might be related to the intensity or polarity of the stimuli. Constant-current stimuli were applied through bipolar electrodes clipped across the lower lip of 14 subjects while EMG recordings were made from a masseter muscle. During stimulation, the subjects sustained a level of masseter activity equivalent to 10% of their maximum. The stimuli were applied as multiples of sensory threshold. The EMGs were analysed following rectification, averaging and smoothing. A sequence of inhibitory, excitatory, inhibitoryand excitatory responses could be produced in the muscle by both polarities of stimuli. The latencies of these four responses were generally in the ranges 10-20, 25-40, 40-55 and 80-100 ms, respectively. These latencies, particularly for the last two responses, tended to decrease at higher intensities of stimulation. The threshold for the long-latency inhibition was significantly lower than that for the short-latency inhibition when the cathode was outside the mouth but not when it was inside the mouth. In addition, the long-latency excitation had the lowest threshold of the four responses regardless of stimulus polarity. Since nerves are excited particularly arounda cathode, we interpret these results as showing that stimulation of nerves supplying the skin outside the mouth evokes predominately long-latency jaw reflexes whereas shorter latency responses can be evoked by stimulating nerves supplying oral mucosa. Furthermore, long latency excitatory reflexes seem to be the most easily evoked by stimulation of the lip.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 21:28:11