Naslov
Relationship between anterior and posterior guidance and temporal muscle activity

Autori
Čelebić, Asja ; Alajbeg, Iva ; Kraljević, Sonja ; Valentić-Peruzović, Melita ; Stipetić, Jasmina

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

Izvornik
Journal of Dental Research / - : Journal of Dental Research, 2006

Skup
International Association of Dental Research (IADR) 2006

Mjesto i datum
Brisbane, Australija, 28.06.2006. - 01.07.2006

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
anterior guidance; posterior guidance; temporal muscle activity

Sažetak
Objectives:Few studies quantify reactions of temporal muscle during clenching at different occlusal positions in individuals with different anterior and posterior guidance relationship and different number of working-side occlusal contacts. The hypothesis was that different relationship between incisal guidance (IG) and a different number of working-side occlusal contacts change a pattern of temporal muscle activity. Methods:EMG activity from temporal muscle during clenching in incisal position (IP) and lateral occlusal positions was compared between dentate subjects (DS) with steeper IG than condylar guidance (PG) and with canine or canine + first premolar guidance in laterotrusive movements with complete denture wearers (CDs) who had steeper PG than IG and group function in laterotrusive movements. EMG activity was expressed as percentage of maximum voluntary clenching for each individual. Results:The CD wearers exhibited significantly higher posterior temporal muscle (TP) activity in IP and during lateral biting on mediotrusive side than DS. In CD wearers coronoid process had to be moved backward by TP fibers to rotate condyle in a counter-clockwise direction (PG>IA) ; contrary DSs had to rotate condyle in a clockwise direction to compensate for vertical overlap (IA>PG). Group function allowed more antagonistic working-side contacts in CDs and significantly higher anterior temporalis (TA) activity than DS. Conclusions:Alteration of occlusal pattern changes a pattern of TA and TP activity in both groups, no matter on the presence of periodontal receptors. Higher TP activity in CD wearers probably stabilises the mandible and allows high isometric contraction of other elevators and this mechanism might influence the rate of residual ridge resorption.

Izvorni jezik
Engleski

Znanstvena područja
Dentalna medicina

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