Relationship between anterior and posterior guidance and temporal muscle activity (CROSBI ID 518195)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Čelebić, Asja ; Alajbeg, Iva ; Kraljević, Sonja ; Valentić-Peruzović, Melita ; Stipetić, Jasmina
engleski
Relationship between anterior and posterior guidance and temporal muscle activity
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.
anterior guidance; posterior guidance; temporal muscle activity
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Podaci o prilogu
2006.
objavljeno
Podaci o matičnoj publikaciji
Journal of Dental Research
Journal of Dental Research
Podaci o skupu
International Association of Dental Research (IADR) 2006
poster
28.06.2006-01.07.2006
Brisbane, Australija