title: Factors affecting masticatory performance of Japanese children.
abstract: OBJECTIVE
  The aim of this study was to analyse occlusal parameters and body variables to examine the factors accounting for masticatory performance of Japanese children in relation to adults.
  
  
  METHODS
  Sixty-six children and 24 adults chewed three pieces of a colour-changeable chewing gum, separately, for 30 s, 60 s, and 90 s. The colour change was measured at 30 s using L* a* b* colour space system. Biting force, occlusal contact areas, and occlusal pressure were recorded by Dental Prescale. Number of strokes, and the height and weight of the subjects were included in the statistical analysis.
  
  
  RESULTS
  Within each sample, Student's t-test revealed significant differences among a* values at the three chewing times in which the value of a* (indicator of red) increased as the length of chewing time increased (P < 0.05). Multiple regression analysis showed that the rate of mandibular movement in preschool children has a significant impact on masticatory performance (P < 0.05). In schoolchildren, the rate of mandibular movement, biting force, and body weight were significant factors (P < 0.05). In adults, occlusal contact area, biting force, and the rate of mandibular movement were the significant factors (P < 0.05).
  
  
  CONCLUSIONS
  Factors affecting masticatory performance differ according to the developmental stage of the individual.
authors.affiliation: Department of Pediatric Dentistry, University of Detroit Mercy, Detroit, MI, USA. oueishs@udmercy.edu
authors.forename: Hassan
authors.initials: H
authors.lastname: Oueis
mesh_terms: D000328:Adult; D001732:Bite Force; D001827:Body Height; D001835:Body Weight; D002638:Chewing Gum; D002648:Child; D002675:Child, Preschool; D003116:Color; D003766:Dental Occlusion; D006801:Humans; D007564:Japan; D008334:Mandible / Q000502:physiology; D008409:Mastication / Q000502:physiology*; D009068:Movement; D011312:Pressure; D013053:Spectrophotometry; D013997:Time Factors; D014070:Tooth / Q000033:anatomy & histology; D055815:Young Adult
chemical_list: D002638:Chewing Gum