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大臼齒에 있어서 琺瑯象牙境界와 齒根分岐點間의 距離에 關한 臨床學的考察

Clinical Observation on the Distance between Cemento-enamel Junction and Bifurcation of Root in Molars.

중앙의학 1965년 8권 5호 p.573 ~ 576
김정수,
소속 상세정보
김정수 (  ) - 연세대학교 의과대학 치과학교실

Abstract


Three hundred thirty five extracted upper and lower molars were measured buccally and lingually to determine the mean on the distance between cemento-enamel junction and the level of the most apically located point of the bifurcation.
1. Bifurcation of the root of the each tooth were as follows;
Lower first molar; cervically one-fourth df total root length.
Lower second molar; cervically one-third of total root length
Upper first molar; cervically one-third of total root length
Upper second molar; cervically half of total root length
2. In the distance between cemento-enamel junction and bifurcation of root, the mean values were as follows;
Lower first molar;
a. buccally, ♂ 2.62mm ♀ 2.81mm
b. Lingually, ♂ 3.90mm ♀ 3.86mm
Lower second molar;
a. buccally, ♂ 3.50mm ♀ 3.49mm
b. Lingually, ♂ 4.54mm ♀ 4.56mm
Upper first molar;
a. Buccaly, ♂ 4.08mm ♀ 4.08mm
b. Mesially, ♂ 4.66mm ♀ 4.66mm
c. Distally, ♂ 5.11mm ♀ 5.04mm
Upper second molar;
a. Buccally, ♂ 5.22mm ♀ 5.20mm
b. Mesially, ♂ 5.55mm ♀ 5.49mm
c. Distally, ♂ 5.87mm ♀ 5.75mm

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