Microstructure, composition, and etching topography of dental ceramics.
Microstructure, composition, and etching topography of dental ceramics.
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发表时间：
2002-03
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通讯作者：
Á. Della Bona;K. Anusavice
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作者：
Á. Della Bona;K. Anusavice
目的通过对蚀刻陶瓷的形貌分析，提供影响微机械固位机制的定性表面结构信息。本研究验证了蚀刻机制根据蚀刻剂的类型和陶瓷的微观结构和组成而变化的假设。材料与方法采用扫描电子显微镜、背散射成像、X射线衍射、光学轮廓仪和基于Phi-Rho-Z校正的波长色散光谱对15种牙科陶瓷进行定量和定性分析。用金刚石化合物将所有陶瓷样品抛光至1微米，并使用以下蚀刻剂和蚀刻时间：氟化氢铵（ABF）1分钟，9.6%氢氟酸（HF）2分钟，和4%酸化磷酸氟化物（APF）2分钟。结果HF产生不规则的蚀刻图案，其中孔隙是特征性的形貌特征。ABF蚀刻陶瓷表面主要表现为沟槽，而APF蚀刻剂导致表面沉淀物的积累。核心陶瓷显示较少的地形变化后，蚀刻，因为它们的氧化铝含量高，化学反应性低。结论三种酸蚀剂的酸蚀机理不同，HF酸蚀效果最好。
PURPOSE Topographic analysis of etched ceramics provides qualitative surface structure information that affects micromechanical retention mechanisms. This study tested the hypothesis that the etching mechanism changes according to the type of etchant and the ceramic microstructure and composition. MATERIALS AND METHODS Quantitative and qualitative analyses of 15 dental ceramics were performed using scanning electron microscopy, back-scattered imaging, X-ray diffraction, optical profilometry, and wavelength dispersive spectroscopy based on Phi-Rho-Z correction. All ceramic specimens were polished to 1 micron with diamond compound, and the following etchants and etching times were used: ammonium bifluoride (ABF) for 1 minute, 9.6% hydrofluoric acid (HF) for 2 minutes, and 4% acidulated phosphate fluoride (APF) for 2 minutes. RESULTS HF produced an irregular etching pattern in which pores were the characteristic topographic feature. ABF-etched ceramic surfaces showed mostly grooves, and APF etchant caused a buildup of surface precipitate. Core ceramics showed less topographic change after etching because of their high alumina content and low chemical reactivity. CONCLUSION The observations suggest that the etching mechanism is different for the three etchants, with HF producing the most prominent etching pattern on all dental ceramics examined.