Occlusal phase of gum-chewing strokes

H. Hayasaki, I. Saitoh, G. S. Throckmorton, Y. Iwase, S. Nakata, M. Nakata

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


The occlusal phase of chewing is especially interesting because food particles are being pulverized in this phase. For efficient chewing the upper and lower teeth must come together in a congruent fashion with less variation than in other phases. To examine this expectation the chewing motions of 28 women were recorded optoelectrically, and their frontal and sagittal angles of the closing and following opening strokes were measured at 3.0 mm (3-D linear distance) of opening. Closing strokes were more stable than opening strokes. The frontal angle was correlated with the sagittal angle during closing. The opening and closing sagittal angles were moderately correlated, and the opening and closing frontal angles were negatively correlated at the intersubject level. No direct association was found between the closing strokes and following opening strokes at the intra-subject level. These results suggest that closing strokes are more stable than opening strokes, resulting in efficient mastication.

Original languageEnglish (US)
Pages (from-to)1041-1046
Number of pages6
JournalJournal of Oral Rehabilitation
Issue number10
StatePublished - Oct 2003


  • Chewing movement
  • Correlation
  • Occlusal phase
  • Opening and closing strokes
  • Stability

ASJC Scopus subject areas

  • Dentistry(all)


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