Lewinstein I, Rotstein I
Hebrew University Hadassah, Jerusalem, Israel.
Endod Dent Traumatol. 1992 Feb;8(1):16-20. doi: 10.1111/j.1600-9657.1992.tb00220.x.
Trichloracetic acid is recommended for the treatment of external cervical root resorption. The present study examined the effect of 90% trichloracetic acid on the microhardness and surface morphology of human dentin and enamel. Intact extracted human teeth were sectioned and embedded in acrylic resin. Each tooth was grinded and highly polished exposing a flat surface of dentin and enamel. The teeth were treated with 90% trichloracetic acid for 30, 60 and 90 s. Vicker's microhardness of the dentin and enamel was assessed for each tooth before and after each treatment. In addition the surface morphology of a trichloracetic acid treated tooth was examined via SEM. The results showed that 90% trichloracetic acid caused a second order type reduction of the microhardness, as well as structural changes in both dentin and enamel.
推荐使用三氯乙酸治疗外部颈缘牙根吸收。本研究检测了90%三氯乙酸对人牙本质和牙釉质显微硬度及表面形态的影响。将完整拔除的人牙进行切片并嵌入丙烯酸树脂。每颗牙齿经研磨和高度抛光，暴露出牙本质和牙釉质的平整表面。用90%三氯乙酸对牙齿分别处理30、60和90秒。在每次处理前后评估每颗牙齿牙本质和牙釉质的维氏显微硬度。此外，通过扫描电子显微镜检查经三氯乙酸处理的牙齿的表面形态。结果显示，90%三氯乙酸导致显微硬度呈二级类型降低，同时牙本质和牙釉质均出现结构变化。
