歯冠豊隆量と辺縁歯肉の厚さが咀嚼時の食塊と歯頸部歯面との接触に及ぼす影響 : 歯頸部歯面の上下的位置による差異について  [in Japanese] Effect of Coronal and Gingival Contours on the Contact of Food Bolus on the Cervical Area of the Crown : Difference of the Food Contacts Measured at the Different Heights  [in Japanese]

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Author(s)

    • 猪野 照夫 INO Teruo
    • 明海大学歯学部歯科補綴学第2講座 The Second Department of Prosthetic Dentistry, Meikai University School of Dentistry
    • 天野 秀雄 AMANO Hideo
    • 明海大学歯学部歯科補綴学第2講座 The Second Department of Prosthetic Dentistry, Meikai University School of Dentistry
    • 岡本 和彦 OKAMOTO Kazuhiko
    • 明海大学歯学部歯科補綴学第2講座 The Second Department of Prosthetic Dentistry, Meikai University School of Dentistry
    • 矢島 俊彦 YAJIMA Toshihiko
    • 明海大学歯学部歯科補綴学第2講座 The Second Department of Prosthetic Dentistry, Meikai University School of Dentistry
    • 佐久間 栄 SAKUMA Shigeru
    • 明海大学歯学部歯科補綴学第2講座 The Second Department of Prosthetic Dentistry, Meikai University School of Dentistry

Abstract

The purpose of this study was to investigate the effect of coronal and gingival contours in the contact with the food bolus on the cervical area of the crown atdifferent heights during mastication. A bridge containing a load cell with two sensitive areas within the pontic and having adjustable coronal and gingival buccal contours was constructed for the missing lower first molar. The buccal surface of the crown was contoured normally or 0.5 mm excessively, and the gingival crest was contoured with 0.5 mm thick or 1.0 mm thick.<BR>Forces in the cervix direction were observed during the closing phases, and forces in the cusp directionwere observed during the opening phase. The former forces were more frequent andintense, and the following results were obtained therefrom.<BR>The contact forces were less frequent in the lower sensitive area than in the upper one, and wereless intense and frequent with the overly contoured crown and gingiva. The contact force decreased greatly in the upper sensitive area because the buccal surface of the crown was overly contoured, and in the lower one because the thickness of the marginal gingiva was increased.<BR>These findings suggested that the friction caused by food bolus on the tooth surface close to gingival crest could be difficult to control by altering only the coronal contour.

Journal

  • Nihon Hotetsu Shika Gakkai Zasshi

    Nihon Hotetsu Shika Gakkai Zasshi 42(1), 51-59, 1998-02-01

    Japan Prosthodontic Society

References:  21

Codes

  • NII Article ID (NAID)
    10008168447
  • NII NACSIS-CAT ID (NCID)
    AN00197911
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    03895386
  • Data Source
    CJP  J-STAGE 
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