A calculation method for the range of occluding phase at the lower incisal point during chewing movements using the curved mesh diagram of mandibular excursion (CMDME).
The purpose of this study was to develop a method for calculating the range of the occluding phase in chewing movements. In this study, we defined 'range' as the distance of the movement at the lower incisal point while the mandible moves with tooth contact. First, mandibular excursions were measured using an opto-electronic movement analysis system, which can measure mandibular movement with six degrees-of-freedom at a sampling frequency of 100 Hz. With use of this measurement data, the curved mesh diagram of mandibular excursion (CMDME) previously reported was made. Then, chewing movements were measured using the same analysis system. The movements were separated into their component chewing cycles. Finally, we calculated the distance between each cycle and the CMDME. The occluding range of our subject was 0.4 mm at the closing phase and 3.4 mm at the opening phase. These results suggest that tooth contact occurs during chewing movement and demonstrate that the range of the occluding phase for the opening and closing phases of a subject can be calculated without morphological data from a dental cast.
Hayasaki
H
H
Department of Paediatric Dentistry, Faculty of Dentistry, Kyushu University, Fukuoka, Japan. haydhi@mbox.nc.kyushu-u.ac.jp
Nakata
S
S
Nishijima
N
N
Okamoto
A
A
Minematsu
K
K
Yamasaki
Y
Y
Nakata
M
M
D000328:Adult; D002638:Chewing Gum; D003196:Computer Graphics; D003766:Dental Occlusion; D004582:Electronics, Medical / Q000295:instrumentation; D006801:Humans; D007180:Incisor / Q000033:anatomy & histology* / Q000502:physiology; D007574:Jaw Relation Record / Q000295:instrumentation; D008297:Male; D008334:Mandible / Q000033:anatomy & histology* / Q000502:physiology; D008409:Mastication / Q000502:physiology*; D008954:Models, Biological; D009068:Movement; D055095:Optics and Photonics / Q000295:instrumentation; D012016:Reference Values; D012815:Signal Processing, Computer-Assisted
D002638:Chewing Gum