ウシ象牙細管の細菌通過性第1報

概要

論文の詳細を見る
The penetration by bacteria through dematinal tubules was studied using a device that included portion of bovine anterior teeth. Strains of 4 genera, Streptococcus mutans, Lactobacillus casei, Stapltylococcus aureus and Escherichia coli, were used for the experiment, and the effects of acid etching of dentin on the penetration of bacteria through the dentin was examined. The time required for penetration through dentinal tubules of acid-etched samples was shorter than that of unetched samples. The minimum time required for half the samples to become positive for bacterial penetration through dentin MPT_<50> was 4 hours for all strains chosen when the acid-etched dentin was the target. In non-acid etched samples, the MPT_<50> varied among the genera and ranged fom 20 hours to 48 hours ; the speed of penetration was Sta. aureus = L. casei>Str. mutans>E. coli. Observation under the scanning electron microscope indicated that the smeared layer was completely coated on the surface of the prepared cavity, and when bacterial penetration acurred, a portion of the smear layer on the dentin disappeared. In longitudinal sections, the penetration by the bacteria into the tubules was visible. From these results, it is suggested that the smeared layer have an important effects on bacterial penetration through these tubules.
日本補綴歯科学会の論文
1990-02-01