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

本研究的目的是将糊瓷应用于全瓷修复体的分层。这种瓷器是为了更容易制造金属烤瓷修复体而开发的。由于这种瓷器是以膏体状态提供的，不需要冷凝，只需要一个平板塑料来堆积。近年来，全瓷修复体因其美学价值和生物相容性而备受关注。糊瓷在全瓷修复体中的应用具有重要的临床应用价值。并对现有的全瓷修复体用糊瓷工艺进行了改进。并对全瓷的物理性能、结合强度、颜色稳定性和显微硬度与常规粉末瓷进行了比较。方法1：实验方法参照ISO 6872：1995牙科陶瓷。本研究测定了所有陶瓷试件的抗弯强度，In-Ceram Alumina(ICa)和Spinell(ICs)在陶瓷试件中包裹了…方法：用直径为20 mm/1 mm的常规粉末瓷(PO)和厚度为1 mm的糊瓷制成烤瓷和抛光瓷盘，用分光光度计(CM-2600d，日本柯尼卡美能达)测定其颜色。测量直接记录在相对于CIE标准光源D65的L^*a^*b^*坐标中。计算PP和PO样品之间的色差f和E，并进行比较，以了解颜色的稳定性。颜色测量后，用日本赤桥MVK-G2型显微硬度计对每个试件进行显微硬度测试，结果表明，与传统粉瓷相比，所有的糊瓷陶瓷都具有相似或略高的抗折强度、相近的颜色稳定性和显微硬度。这些结果意味着新开发的糊瓷可以用于全瓷修复体。较少

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