A practical study on esthetic restoration with newly developed paste porcelain.

本研究的目的是将膏状瓷应用于全瓷贴面的分层。这种陶瓷是为了更容易制造金属陶瓷涂层而开发的。由于这种陶瓷是以膏状提供的，因此不需要冷凝，只需要一个扁平的塑料就可以了。近年来，全瓷修复体因其美观和生物相容性而受到广泛关注。膏体瓷在全瓷修复中的应用具有广阔的临床应用前景。并对现有的全瓷化膏瓷工艺进行了改进。方法1：按照ISO 6872：1995牙科陶瓷标准进行实验研究。本研究测定了所有陶瓷样品的弯曲强度，In-Ceram氧化铝（伊卡）和尖晶石（ICS）， 关于我们 方法2：采用CM-2600 d型分光光度计，对20 mm直径/1 mm厚度的普通粉瓷（PO）和膏状瓷（Paste Porcelain）制作的瓷盘进行颜色对比研究。测量结果直接记录在相对于CIE标准光源D 65的L^*a^*B^* 坐标中。通过计算PP和PO试样间的色差f、E，比较PP和PO试样间的色差f、E，了解PP和PO的颜色稳定性。通过显微硬度测试仪（MVK-G2，AKASHI，JAPAN）测定陶瓷的维氏硬度（Vickers Hardness），结果表明：与普通粉瓷相比，所有陶瓷层覆瓷的抗折强度、颜色稳定性和显微硬度均相近或略高。这些结果表明，新开发的膏体瓷可以投入实际使用的全瓷澄清。少

The objective of this research was to put the paste porcelain to practical use for layering of all-ceramic restorations. This porcelain has been developed for easier fabrication of metal-ceramic restorations. Since this porcelain is supplied as paste state, no condensation is needed, only a flat plastic is necessary for build-up. Recently, all-ceramic restorations have been focused because of its esthetic merit and biocompatibility. Application of paste porcelain(PP) to all-ceramic restoration can be very useful for clinical field. Then we tried to improve the existing process of paste porcelain for all-ceramic restorations. And physical properties and the bond strength for all-ceramics and color stability and microhardness comparing to those of conventional powder porcelain were evaluated.Methods 1 : the experimental method followed ISO 6872:1995 Dental ceramics. This study determined the flexural strength of all ceramic specimens, In-Ceram Alumina (ICA) and Spinell (ICS) layered with … More PP comparing to those layered with conventional powder porcelain, Vitadur Alpha (VA).Methods 2 : the color of fired and polished porcelain disks, made with conventional powder porcelain (PO) and Paste Porcelain, 20mm diameter/1mm thickness, were studied using a spectrophotometer (CM-2600d, KONICA MINOLTA, JAPAN). Measurements were recorded directly in L^*a^*b^* coordinates relative to CIE standard light source D65. Color difference f¢E among the specimens of PP and PO were calculated and compared to know the color stability. After color measurements, microhardness test was made on each specimen to measure the Vickers Hardness using the microhardness testing machine (MVK-G2, AKASHI, JAPAN).From the results of these experiments, we can conclude that all ceramics layered with paste porcelain possesses similar or slightly higher flexural strength and similar color stability and microhardness comparing to those of conventional powder porcelain. These results mean the newly developed paste porcelain can be put to practical use for all-ceramic restorations. Less