ヒトの臼歯咬合面形態と補綴学的平面との関係について
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概要
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In order to make clear the significance of occlusal form in the masticatory system and make the standard of occlusal restoration, the author investigated the form of occlusal surface of posterior teeth to the prosthetic plane which included the lowest point of left ala of nose and the lowest point of left and right external auditory meatus. Forty subjects who had normal occlusion, 11 males and 29 females, with a mean age of 18.6 years, were included in this study. Formcorder and X-Y Recorder were used as a measuring apparatus for this study, and the following results were obtained. (1) For the mesial and the distal inclined plane of cusp and the total occlusal surface of posterior tooth, the sizes of these projective areas to the prosthetic plane were decreased in the following order. They were first molar, second molar, first premolar and second premolar in the case of upper jaw, while for lower jaw, the order was first molar, second molar, second premolar and first premolar. (2) A significant difference below 5% significance level was not recognized between the projective area of mesial and distal inclined plane of cusp in the arrangement of upper posterior teeth. But in the arrangement of lower posterior teeth, the projective area of distal inclined plane was bigger than that of mesial, and the difference of projective area was 14.40mm^2 in the case of male and 14.07mm^2 in the case of female respectively. (3) The triangular ridge inclination to the prosthetic plane became bigger in the direction of posterior tooth in the stamp cusp, but the triangular ridge inclination of molar was smaller than that of premolar in the shearing cusp. (4) The open angle made by the buccal and the lingual triangular ridge was 103∿108°in upper premolars, 111∿125°in upper molars, 124°in lower second premolar and 111∿127°in lower molars. (5) The line from the incisal edge of lower central incisor to distobuccal cusp tip of lower second molar in male and the line from that to distolingual cusp tip of lower second molar in female were parallel with the prosthetic plane extremely. These two lines and the prosthetic plane converged anteriorly. (6) After measuring the greatest buccolingual tooth dimension and intercuspal distance, the order of these size in each tooth was nearly same as the order of size in the projective area of inclined plane. (7) The ratio of intercuspal distance to the greatest buccolingual tooth dimension was about 48∿66% in upper jaw, and about 45∿58% in lower jaw.
- 九州歯科学会の論文
- 1976-01-31
著者
関連論文
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- ヒトの臼歯咬合面形態と補綴学的平面との関係について : 主論文の要旨
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