title: Head motion may help mouth opening in children.
abstract: Concomitant head and mandibular movement during jaw function is well known in adults; however, its importance in children has not been studied. The brain attains 85-90% of its adult weight at 5 years of age, though the maximum rate of condylar growth is attained at approximately 14 years of age. These findings suggest that the coordination of the head and mandible may differ between children and adults. This study investigated head and mandibular movements of 19 children with complete primary dentition (average age: 5 years 5 months) and compared their functional integration of jaw and head movements to those of 16 female adults (average age: 20 years 3 months) with permanent dentition. Although the mandibular opening distance was significantly greater in the adults, the magnitude of concomitant head motion was greater in children. The results suggest that head extension in children helps increase the magnitude of mouth opening more than in adult women.
authors.affiliation: Takahashi Orthodontic Clinic, Tsukuba City, Ibaragi Prefecture, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kuroda
authors.forename: I
authors.initials: I
authors.lastname: Saitoh
authors.forename: E
authors.initials: E
authors.lastname: Inada
authors.forename: Y
authors.initials: Y
authors.lastname: Takemoto
authors.forename: T
authors.initials: T
authors.lastname: Iwasaki
authors.forename: Y
authors.initials: Y
authors.lastname: Iwase
authors.forename: C
authors.initials: C
authors.lastname: Yamada
authors.forename: M
authors.initials: M
authors.lastname: Shinkai
authors.forename: Y
authors.initials: Y
authors.lastname: Matsumoto
authors.forename: H
authors.initials: H
authors.lastname: Hasegawa
authors.forename: Y
authors.initials: Y
authors.lastname: Yamasaki
authors.forename: H
authors.initials: H
authors.lastname: Hayasaki
mesh_terms: D000367:Age Factors; D001921:Brain / Q000254:growth & development; D002648:Child; D002675:Child, Preschool; D003766:Dental Occlusion; D019229:Dentition, Permanent; D004581:Electronics; D005260:Female; D019416:Head Movements / Q000502:physiology*; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008334:Mandible / Q000502:physiology*; D008335:Mandibular Condyle / Q000254:growth & development; D008410:Masticatory Muscles / Q000502:physiology; D010781:Photography; D016059:Range of Motion, Articular / Q000502:physiology*; D012399:Rotation; D013704:Temporomandibular Joint / Q000502:physiology*; D014094:Tooth, Deciduous; D055815:Young Adult