Naslov
The EMG activity of masticatory muscles during different chewing tasks

Autori
Valentić-Peruzović, Melita ; Illeš, Davor ; Alajbeg Ž., Iva ; Babara, Marija ; Čelebić, Asja ; Juroš, Višnja

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, stručni

Izvornik
Book of abstracts of 26th Annual Conference of Europeean Prosthodontioc Association / - Zagreb, 2002, 109-109

Skup
26th Annual Conference of Europeean Prosthodontioc Association

Mjesto i datum
Cavtat, Hrvatska, 26.09.2002. - 28.09.2002

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
masticatory muscles; chewing

Sažetak
Mastication is a highly coordinated neuromuscular function that involves fast effective movements of the jaw and continuous modulation of muscle force. To understand the relationship between muscles during mastication it is necessary to know the position and direction of movement of the mandible. MATERIALS AND METHODS: Twenty-four young healthy adults, age ranged 17 to 27, participated in this study. They were chosen among dental students of School of Dental Medicine in Zagreb and had to be free of sign and symptoms of TMD. Surface EMG recordings were obtained from left and right anterior temporal muscle, left and right masseter muscle and from left and right digastric muscle on the 8 channel PC based EMGA-i, apparatus for simultaneous recording of myoelectrical activity (6 differential EMG channels, input impedance 100 MW, CMRR> 95 dB at 5o Hz, bandwidth 2 Hz-1 kHz, programmable input sensitivity from 100mVpp to 2o mVpp, an 8 bit resolution A/D conversion, 2 kHz sampling rate) - occlusal sounds (2 audio channels), specially designed and developed for the purpose of kinesyological examinations of stomatognathic system's function. The disc electrodes (Ag/AgCI, diameter 10 mm) were placed 2 cm apart in the main direction of the muscle fibres. RESULTS: Main effect of factor "functional movement" was significant at p<o.o1, and values were the highest for gum chewing, and the lowest for empty chewing except for digastric muscle which had lowest values at continuous isometric contraction. Main effect of factor "muscles" was significant at p<o.o1 for all muscles involved, values were similar for the same muscles on left and right side. Main effect of factor "time" was statistically significant p<o.o5 for all cases showing decreasing trends except in last minute during functional movements. Interactions between factors "functional movement" and "time" were present at significance p<o.ol.

Izvorni jezik
Engleski

Znanstvena područja
Dentalna medicina

POVEZANOST RADA