Jaw motion during gum-chewing in children with primary dentition.
This study was undertaken to characterize jaw motion during mastication in children with primary dentition and to compare jaw motion with that in adults. The means and the variances of the traditional parameters for the chewing cycle, i.e., duration, excursive ranges and 3-D distances of travel at the lower incisor, molars and condyles were analyzed and compared in 23 children and 25 female adults. The duration of opening in children was significantly shorter than that of adults. Significant differences between children and adults were observed in lateral and vertical excursion of the incisor, lateral excursion at the molars, and vertical excursion at the condyles. Many of these measurements had larger between-subject and between-cycle variances in children than adults, suggesting that chewing motion in children has not yet matured. The results of this study indicate that chewing motion in children is different from that of adults.
Section of Pediatric Dentistry, Division of Oral Health, Growth, and Development, Kagoshima University Graduate School of Dental Science, Japan.
Naoko
N
Kubota
Haruaki
H
Hayasaki
Issei
I
Saitoh
Yoko
Y
Iwase
Tomoaki
T
Maruyama
Emi
E
Inada
Hiroko
H
Hasegawa
Chiaki
C
Yamada
Yoshihiko
Y
Takemoto
Yuko
Y
Matsumoto
Youichi
Y
Yamasaki
D000328:Adult; D000367:Age Factors; D002638:Chewing Gum; D002675:Child, Preschool; D004581:Electronics / Q000295:instrumentation; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D007180:Incisor / Q000502:physiology; D008297:Male; D008334:Mandible / Q000502:physiology*; D008335:Mandibular Condyle / Q000502:physiology; D008409:Mastication / Q000502:physiology*; D008963:Molar / Q000502:physiology; D009068:Movement; D055096:Optical Devices; D016059:Range of Motion, Articular / Q000502:physiology; D012815:Signal Processing, Computer-Assisted; D013997:Time Factors; D014094:Tooth, Deciduous; D055815:Young Adult
D002638:Chewing Gum