下顎前歯部正面形態の増齢的変化

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概要

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• With regard to the upper anterior teeth, many studies have been made on forms, sizes, standards for selecting colors, and state of dentition. However, little concern has been shown on the lower anterior teeth from the viewpoint of esthetics, although they are as clearly visible as the upper anterior teeth during speaking. Therefore, with 56 individually normal dentulous males, 20 to 40 years of ages, as subjects, incisal point, gingival point, and interdental papillary apex were measured and the horizontal and vertical relationships in position with aging among the measured items and changes in position of each measured item were examined. The prosthetic plane was used as the vertical base plane and the contact points of the lower left and right central incisors as the horizontal reference points. The results were as follows : 1. Incisal point, incisal embrasure apex, and gingival embrasure apex showed little changes horizontally and vertically with aging. 2. Gingival point showed a tendency to lower slightly with aging. For all ages, the gingival points of the central and lateral incisors were at about the same positions, and that of the canine was located at about 1.5mm below those points. 3. Interdental papillary apex lowered with a statistical significance with aging. The extent of lowering was about the same for all items. 4. Interdental papillary apex and gingival point both lowered vertically ; however, the former showed a greater tendency to lower with aging. 5. The coronal axis was positioned about vertically to the occlusal plane for the central and lateral incisors but inclined about 8°mesially for the canine. 6. The coronal twist angles of the central and lateral incisors and canine were 0°, 13-18°, and 31-35°, respectively. 7. Incisal embrasure area showed no changes with aging but gingival embrasure area tended to decrease with aging. 8. The clinical coronal lengths of the lateral incisor and canine were about the same for both the upper and lower jaws but that of the central incisors was greater for the upper jaw.

• 九州歯科学会の論文
• 1987-12-25

著者

• 佐藤 清高

  九州歯科大学歯科補綴第1講座

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• 下顎前歯部正面形態の増齢的変化

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