齒牙各咬頭頂と補綴學的平面との位置的關係に就いて : スピー氏彎曲の臨床的觀察

抄録

When the artificial full denture be made for the purpose of reconstructing the lost function of patient's mastication and speech or his appearance, care must be taken of the fact that we are dealing with a living body which differs racially in topographic anatomical details. The author made the measurements on one hundred individuals of the various distances from the occlusal plane to each cusp of lower teeth and found that the occlusal plane established hypothetically by Dr. Gysi would be inapplicable for the Japanese jaws. The measurements showed that the lowest point in dental arch should fall on the contact point between the lower second bicuspid and first molar. It was also shown that the height of buccal cusp of second bicuspid came to the height of mucous rise at the glandula retro molare which is said to keep well its previous level even in edentulous jaw. In view of these findings the author think it advisable in arranging the artificial teeth that the disto-buccal cusp of extreme molar be posed at the same height with the posterior margin of trial base plate so as to keep the denture in the natural anatomical position and to reproduce in it the harmonious ralationship between cusps and tongue.