Naslov
Isotonic and isometric muscle activity in an open- close-clench cycle in individuals with normal occlusion and artificial occlusal interference.

Autori
Čelebić, Asja ; Valentić-Peruzović, Melita ; Cifrek, Mario ; Magjarević, Ratko ; Kern, Josipa ; Vojvodić, Denis

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, kratko priopćenje, znanstveni

Izvornik
Proceedings 10th International Symposium on Biomedical Engeneering '94 / - Zagreb : Hrvatsko društvo za biomedicinsko inženjerstvo i medicinsku fiziku ; Hrvatsko društvo za komunikacije, računarstvo, elektroniku, mjerenja I automatiku (KoREMA), 1994, 155-158

ISBN
953-6037-06-8

Skup
10th International Symposium on Biomedical Engeneering '94

Mjesto i datum
Zagreb, Hrvatska, 24.11.1994. - 26.11.1994

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Recenziran

Ključne riječi
Isotonic and isometric muscle activity, open-close-clench cycle

Sažetak
The purpose of this study was to compare the isotonic (UIT) to isometric (UIM) muscle activity in an open-close-clench cycle (OCC cycle) in individuals with normal occlusion and to compare the isometric muscle activiry in an OCC cycle to the isometric activity of the maximum voluntary clenching, as well as to find out the influence of an artificial occlusal interference on the UIT and UIM in an OCC cycle. EMG signals were recorded from 4 masticatory elevator muscles: anterior right and left temporal (RAT, LAT) and right and left masseter muscle (RM, LM) simultaneously with the signals of the occlusal sound in 10 OCC cycles on the EMGA-1 apparatus for each of 62 individuals with healthy occlusion. In 35 indivlduals an artificial occlusal interference of a self-curing acrylic resin was applied to the right lower premolar and ten EMG registrations of an OCC cycle for each participant were again recorded. There was no significant dffirence between UIT and UIM in an OCC cycle (p>0.05), while UIM was significantly greater in the maximum voluntary clenching than in the OCC cycle (p < 0.01), proving an increased spatial and temporal summation of motoneuron drive under central voluntary command during maximum voluntary clenching. When the artificial occlusal interference was applied, the UIT was significantly reduced only for the RAT and LAT (p<0.01), while UIM was significantly reduced for RTA, LTA, RM and LM (p<0.01). This results confirm the existance of the reflex arch whith positive feed back, which reduces the harmful influence of an artificial occlusal interference on the periodontal ligament and also prove that the temporal muscle is more responsible for the spatial control of the lower jaw than the masseter muscle, which is more responsible for the powerful contraction.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika, Dentalna medicina

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