歯内療法を受けた歯冠未封鎖歯のin vitro細菌透過性．

In vitro bacterial penetration of coronally unsealed endodontically treated teeth.

抄録

45 本の根管を洗浄し，成形した後，側方凝結法を用いて，ガッタパーチャと根管シーラーで閉塞した．根充材の歯冠部を Staphylococcus epidermidis および Proteus vulgaris に接触させた．これらの細菌が根管全体に浸透するのに必要な日数を測定した．S. epidermidisに19日間暴露した後，根管の50％以上が完全に汚染された．また，充填物の冠状面をP. vulgarisに42日間暴露したところ，根管の50％が完全に汚染された．

Forty-five root canals were cleaned, shaped, and then obturated with gutta-percha and root canal sealer, using a lateral condensation technique. The coronal portions of the root filling materials were placed in contact with Staphylococcus epidermidis and Proteus vulgaris. The number of days required for these bacteria to penetrate the entire root canals was determined. Over 50% of the root canals were completely contaminated after 19-day exposure to S. epidermidis. Fifty percent of the root canals were also totally contaminated when the coronal surfaces of their fillings were exposed to P. vulgaris for 42 days.