上顎第一小臼歯の歯根形態と歯周病変について : II. 根面溝の形態学的研究

概要

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One hundred and six extracted upper first premolars with one root were examined for the incidence of the lateral grooves on each root surface, and their length and their form on the mesial surface. The results were as follows : 1. The incidence of lateral grooves on both mesial and distal surfaces was 73.6%, on mesial was 17.9%, and on neither surface was 6.6%. 2. As regard to the length of the groove, half of the grooves that originate from between the neck of the root and one-third of the root run across the one-half of the root. 3. The form of the groove was divided into three categories by bucco-lingual ground sections of plastic tooth casts-flat type in 46.5%, shallow concaved in 39.4% and narrow V-shaped in 14.1%.
特定非営利活動法人日本歯周病学会の論文
1975-09-25