超・極低出生体重児における咀嚼機能の発達  [in Japanese] Development of Mastication in Children with Extremely Low and Very Low Birthweight  [in Japanese]

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Abstract

超・極低出生体重児に対して咬合力,咀嚼機能および乳犬歯間幅径についての検討を行い,さらに成長による咀嚼機能の変化についても検討した。<BR>その結果,超・極低出生体重児は満期正常出生児と比較して咬合接触面積,咬合力および乳犬歯間幅径は有意に小さい値を示した。また咀嚼筋筋活動量については超・極低出生体重児が有意に大きい値を示した。さらに超・極低出生体重児は成長するにつれて咬合接触面積および咬合力は大きくなっていたが,咀嚼筋筋活動量については逆に小さくなり満期正常出生児に近づく傾向がみられた。これらのことから超・極低出生体重児は満期正常出生児よりも咬合力が弱く,その補完として咀嚼筋が大きく活動し,咀嚼機能については身体的発育よりも早い段階で追いつくことが示唆された。

The purpose of the present study was to investigate the development of the masticatory function, the occlusal force and primary canine distance in children with extremely low and very low birthweight (EVLBW).<BR>The subjects were nine children aged 4.3 to 5.8 yrs (mean 5.0 yrs old) who were born with EVLBW and 16 healthy and normal birthweight children as controls with ages matched those with extremely low and very low birthweight. In seven children of the EVLBW the development of mastication had been observed continuously for 1.5 years. Electromyography (EMG) were recorded while chewing from the bilateral temporal and masseter muscles, and the unilateral digastric muscle. The occlusal contact area and the occlusal force were measured using the bite pressure detecting system Dental Prescale®.<BR>The occlusal contact area, occulusal force and bilateral primary canine distance of those with EVLBW were significantly smaller than those with normal birthweight children. However, the muscle activity of those with EVLBW was found to be significantly higher than that of those with normal birthweight children. According to growth and development for 1.5 years, both the values of occulusal contact area and the occulusal force for those with EVLBW significantly increased, whereas muscle activities of those with EVLBW decreased.<BR>In conclusion, it is suggested that the masticatory muscles of those with EVLBW when chewing would be much more activated to compensate for their low occulusal force, but their masticatory function might be caught up in an earlier stage than their general growth.

Journal

  • The Japanese Journal of Pediatric Dentistry

    The Japanese Journal of Pediatric Dentistry 40(5), 832-842, 2002-12-25

    The Japanese Society of Pediatric Dentistry

References:  46

Cited by:  3

Codes

  • NII Article ID (NAID)
    10012157095
  • NII NACSIS-CAT ID (NCID)
    AN00116228
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    05831199
  • Data Source
    CJP  CJPref  J-STAGE 
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