抄録
Five testfoods, kamaboko, raisin, peanuts, beefjerky and a piece of chewing gum (control), were used to investigate the characteristics in masticatory movements.During unilateralmastication of each food, surface EMGs from the bilateral masseter (Mm) and posteriortemporal (Tp) muscles were recorded simultaneous with MKGmotions in twenty normal subjects.
The swallowing threshold of each food were also obtained.
The results obtained were as follows:
The swallowing threshold did not differ significantly among the test foods.
The harder and/or morefibrous the food was, the longer occluding phase time and the wider chewing vectors in MKG were seen.
Also, early onset of the chewing side Tp and increased activities in EMGs in the chewing side Mm were seen.
Chewing rhythmicity was higher in soft gum and raisin, and lower in kamaboko, peanuts and beefjerky.
In conclusion, it might be supeculated that the masticatory movement of softgum and raisin would be controlled more peripherally, while the other test foodsrather centrally.
