Dumlupinar University, Kutahya, Turkey.
J Prosthet Dent. 2011 Aug;106(2):109-17. doi: 10.1016/S0022-3913(11)60104-2.
Ceramics should be radiopaque enough to be seen on radiographs and to be distinguishable from tooth structures. Information on the radiopacity of different ceramics used in restorative dentistry is limited.
The purpose of this study was to investigate the radiopacity of ceramics in comparison with human and bovine dental hard tissues and metals.
A total of 128 disk-shaped specimens, 6 × 1 mm (n=8), were prepared from dental ceramic materials and metals. The optical densities of each material, along with 2 tooth sections (canine and molar teeth), bovine dentin and enamel specimens, and 2 different aluminum step wedges, were measured from radiographic images using a transmission densitometer. The optical densities of the specimens were used to determine the equivalent aluminum thicknesses. The data were analyzed by nonparametric 1-way ANOVA (Kruskal-Wallis) and Student-Newman-Keuls multiple range tests for post hoc comparison (α=.05).
Among ceramic materials, Cercon Zirconia had the highest and the Cergo Pressable Ceramic had the lowest radiopacity values. Cergo Pressable Ceramic, Noritake Super Porcelain EX3 dentin, IPS Empress e.max Press, Cercon Kiss dentin, IPS Empress 2, Cercon Ceram dentin, bovine dentin, human canine, and molar tooth dentin radiopacity measurements were not significantly different. The radiopacity measurements of In-Ceram Alumina, In-Ceram Spinell, Celay Alumina, Titanium alloy (Ti-6Al-4V), Celay Zirconia, In-Ceram Zirconia, NiCr alloy, Wieland Zirconia, Cercon Zirconia, and 22-carat gold were significantly higher than that of bovine enamel (P<.05).
Significant differences in radiopacity were found among ceramic materials, when compared to metals, bovine enamel and human and bovine dentin. Cercon and Wieland Zirconia had high radiopacity values, which were similar to metals.
陶瓷材料应当具有足够的射线可透性，以便在射线照片上可见，并与牙齿结构区分开来。关于修复牙科中使用的不同陶瓷的射线可透性的信息有限。
本研究的目的是调查陶瓷的射线可透性，以比较其与人类和牛的牙齿硬组织和金属的射线可透性。
共制备了 128 个直径为 6×1mm 的圆盘状样本（n=8），来自牙科陶瓷材料和金属。使用透射密度计从射线照片中测量每种材料以及 2 个牙段（犬齿和磨牙）、牛牙本质和牙釉质标本以及 2 个不同的铝阶跃楔块的光学密度。使用样本的光学密度来确定等效铝厚度。使用非参数 1 方式方差分析（Kruskal-Wallis）和学生-纽曼-凯斯多重范围检验进行数据分析，用于事后比较（α=.05）。
在陶瓷材料中，Cercon Zirconia 的射线可透性最高，Cergo Pressable Ceramic 的射线可透性最低。Cergo Pressable Ceramic、Noritake Super Porcelain EX3 牙本质、IPS Empress e.max Press、Cercon Kiss 牙本质、IPS Empress 2、Cercon Ceram 牙本质、牛牙本质、人类犬齿和磨牙牙本质的射线可透性测量值没有显著差异。In-Ceram Alumina、In-Ceram Spinell、Celay Alumina、钛合金（Ti-6Al-4V）、Celay Zirconia、In-Ceram Zirconia、NiCr 合金、Wieland Zirconia、Cercon Zirconia 和 22 克拉金的射线可透性测量值显著高于牛牙釉质（P<.05）。
与金属、牛牙釉质和人类及牛牙本质相比，陶瓷材料的射线可透性存在显著差异。Cercon 和 Wieland Zirconia 具有较高的射线可透性，与金属相似。
