[Human mandibular movements during swallowing saliva. 2. Duration of swallowing saliva and that of tooth contact].
The sagittal incisal jaw movement during swallowing saliva was measured on 11 subjects (range: 24-30 years old) with "normal occlusion" by using a two-dimensional system applied infrared sensor. The duration of swallowing saliva and that of tooth contact were calculated with the program developed in our laboratory. The results obtained were as follows: 1. The average of the duration of swallowing saliva (T1) was approx. 3.5 sec on 11 subjects. 2. The average of the duration of tooth contact during swallowing saliva (T2) was approx. 2.1 sec on 11 subjects. Type Ia had the longest T2 (approx. 2.5 sec) among the types of tooth contact. 3. Type Ia had a greater ratio T2/T1 (74.4%) than those of the other types. In conclusion, it was clearly shown that the subject of type Ia had a longer duration of tooth contact during swallowing saliva than those of the other types in the absolute and relative values.
Kobayashi
J
J
The 1st Department of Prosthetic Dentistry, Faculty of Dentistry, Kyushu University.
Ikono
R
R
Terada
Y
Y
D000328:Adult; D003679:Deglutition / Q000502:physiology*; D003766:Dental Occlusion; D006801:Humans; D007259:Infrared Rays; D008334:Mandible / Q000502:physiology*; D009068:Movement; D012463:Saliva; D013997:Time Factors