Franchi M, Eppinger F, Filippini G F, Montanari G
School of Dentistry, University of Bologna, Italy.
Bull Group Int Rech Sci Stomatol Odontol. 1992 Sep-Dec;35(3-4):93-7.
Premolars roots of humans were manually instrumented with K-type files and irrigated with different solutions to evaluate the rate of cleaning of endodontic surface. Root canals irrigated with 0.9% saline solution or H2O2 (10 volumes) showed the presence of predentin and amorphous smear layer. Thick smear layer was always present on endodontic walls rinsed with 5% solution of NaOCl. Specimens treated with 0.2% solution of EDTA showed partially clean dentinal tubules orifices and remnants of a thin smear layer. Occasional uninstrumented areas of the same roots presented smear layer remnants and predentin with calcified bacteria. The root canals irrigated with NaOCl and EDTA solutions alternated after each instrument showed at the dentin surface thick smear layer: only few dentinal tubules orifices were visible. Endodontic surface of root canals irrigated with NaOCl during instrumentation and finally rinsed with EDTA solutions showed the most homogeneous ultrastructural pictures: partially clean dentinal orifices were detectable in the whole canals.
使用K型锉手动预备人类前磨牙牙根，并使用不同溶液冲洗，以评估根管表面的清洁率。用0.9%生理盐水或过氧化氢（10体积）冲洗的根管中存在前期牙本质和无定形玷污层。用5%次氯酸钠溶液冲洗的根管壁上始终存在厚的玷污层。用0.2%乙二胺四乙酸（EDTA）溶液处理的标本显示牙本质小管口部分清洁，并有薄玷污层残留。同一牙根偶尔未预备的区域存在玷污层残留和带有钙化细菌的前期牙本质。每次器械操作后交替使用次氯酸钠和EDTA溶液冲洗的根管，在牙本质表面显示出厚的玷污层：仅可见少数牙本质小管口。在器械操作期间用次氯酸钠冲洗并最终用EDTA溶液冲洗的根管的根管表面显示出最均匀的超微结构图像：在整个根管中均可检测到部分清洁的牙本质管口。
