Measuring system for lip movements using two video trackers.
Movements of soft tissues surrounding the oral cavity, especially lips and cheeks, have a strong influence on mastication and phonetics. They also influence the relationship between a denture and its oral environment. The purpose of this study was to develop a three-dimensional measuring system for soft tissue movement. This system consisted of two video trackers placed stereographically and a computer. In addition, one video tracker was connected for measuring mandibular movements. The accuracy of this system was evaluated using computerized XYZ pulse stage. The resolution of this system was 0.10 x 0.10 x 0.10 mm, when the measurement was carried out in the area of the 24.0 (X) x 20.0 (Y) x 20.0 (Z) mm with a working distance of 500 mm and a frequency of 120 Hz. In the present study, the lip movements of a dentulous subject with mandibular movements during chewing peanuts were analysed using this system. The new system demonstrated its value for analysing soft tissue movement.
Sekita
T
T
Department of Geriatric Dentistry, Faculty of Dentistry, Tokyo Medical and Dental University, Tokyo, Japan. t.sekita.gero@dent.tmd.ac.jp
Minakuchi
S
S
Hirano
Y
Y
Kobayashi
K
K
Nagao
M
M
D000328:Adult; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods*; D008046:Lip / Q000502:physiology*; D008297:Male; D008334:Mandible / Q000502:physiology; D008409:Mastication / Q000502:physiology; D009068:Movement; D015203:Reproducibility of Results; D014741:Video Recording / Q000295:instrumentation*