上顎乳臼歯頬側溝展開角と窩洞外形について Relationship Between the Occlusal Angles of the Buccal Grooves in the Maxillary Deciduous Molars and Outline Form of Cavity

この論文にアクセスする

この論文をさがす

著者

抄録

咬耗の殆ど認められない3歳0か月から3歳1か月未満の小児の正常乳歯列模型を使用し,上顎第一乳臼歯および第二乳臼歯の頬側溝展開角について計測した結果,以下の結論を得た。<BR>1)頬側溝展開角の平均値は,中央小窩寄り1/3では,上顎第一乳臼歯で128.40°,上顎第二乳臼歯で107.43°であった。頬側縁寄り1/3では,上顎第一乳臼歯で137.44°,上顎第二乳臼歯で107.15° であった。<BR>2)第一乳臼歯は第二乳臼歯に比べ,頬側溝展開角は大きく,また,中央小窩から頬側縁に向かうに従い,大きくなる傾向が認められた。<BR>3)上顎乳臼歯における窩洞形成時の頬側溝追求の有無を調査したところ,第一乳臼歯では,頬側溝を追求した症例は32%,頬側溝が存在していたにもかかわらず,追求されていなかった症例は68%であった。一方,第二乳臼歯では全ての症例において頬側溝が追求されていた。

The aim of this present study was to measure the occlusal angles of the buccal grooves in the maxillary deciduous and to reveal the difference of the angles between maxillary first deciduous molar and second deciduous molar. Dental casts of the deciduous dentition were obtained from children aged from three years under three years and one month, and caries free, hardly any attrition and with normal occlusion. The occlusal angles of the buccal grooves in the maxillary first deciduous molar and second deciduous molar were measured. The tangents were drawn at the disto-internal oblique plane of the mesiobuccal cusp and the mesio-internal oblique plane of the distobuccal cusp. The occlusal angle of the buccal groove was defined as the interior angle which intersected these tangents.<BR>The results were as follows.<BR>1. The mean occlusal angle of the buccal groove of the one third near the central pit was 128.40°at the maxillary first deciduous molar and was 107.43°at the maxillary second deciduous molar. The mean occlusal angle of the buccal groove of the one third near the buccal margin was 137.44°at the maxillary first deciduous molar and was 107.15° at the maxillary second deciduous molar.<BR>2. The mean occlusal angles of the buccal groove of the maxillary first deciduous molar were larger than that of the maxillary second deciduous molar, and indicated a tendency for the angles to increase from the central pit toward the buccal margin.<BR>3. According to research regarding whether the buccal groove was included in the outline form of cavity on the maxillary deciduous molars, the cases of first deciduous molars which included the buccal groove accounted for 32%, and those excluding the buccal groove accounted for 68%. On the other hand, the buccal groove was included in the outline form of cavity on the second deciduous molars in all the cases.

収録刊行物

  • 小児歯科学雑誌

    小児歯科学雑誌 36(4), 670-676, 1998-09-25

    The Japanese Society of Pediatric Dentistry

参考文献:  26件中 1-26件 を表示

各種コード

  • NII論文ID(NAID)
    10013868847
  • NII書誌ID(NCID)
    AN00116228
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05831199
  • データ提供元
    CJP書誌  J-STAGE 
ページトップへ