氢氟酸蚀刻机加工陶瓷Vita Cerec Mark Ⅱ表面形貌的扫描电镜研究

SEM Study of Machinable Vita Cerec Mark Ⅱ Porcelain Surface Morphology After HF Acid Etching

采用扫描电镜研究在３０个氢氟酸（ＨＦ酸）浓度－时间点下陶瓷蚀刻表面和断面形貌特征，并测定表面孔隙率和断面蚀刻深度。结果表明：蚀刻深度随浓度和时间递增有增加趋势，但ＨＦ酸浓度在５．０％以上，蚀刻时间７．５ｍｉｎ以上，蚀刻深度变化不明显；孔隙率与ＨＦ酸浓度一时间呈正相关关系。

After HF acid etching under 5 different HF concentrations and 6 exposing times,the surface morphology of machinable porcelain was examined by scanning electron microscope,and the porsosity percentage and ething depth were determined. The results showed that the etching depth increased with the rising of HF concentration and disposing time until 5%7.5 min.The porosity percentage of ething surface was positively interrelated with HF concentration and disposing time.It was the first time to classify the etching patterns of machinable porcelain into four groups.