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

本研究的目的是将浆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陶瓷修复体而开发的。由于这种瓷器是作为糊状供应的，不需要冷凝，只需要一个平坦的塑料来建立。近年来，全陶瓷修复体因其具有良好的美观性和生物相容性而备受关注。浆糊瓷在全瓷修复中的应用在临床上具有重要的应用价值。然后，我们尝试改进现有的糊瓷工艺，用于全陶瓷修复。并对全瓷的物理性能、结合强度、颜色稳定性和显微硬度进行了比较。方法1：实验方法遵循ISO 6872:1995口腔陶瓷标准。本研究测定了所有陶瓷试样的抗弯强度，与传统粉末陶瓷（Vitadur Alpha， VA）相比，含有更多PP的In-Ceram Alumina （ICA）和Spinell （ICS）。方法二：用分光光度计（CM-2600d, KONICA MINOLTA， JAPAN）对直径20mm /厚度1mm的普通粉瓷（PO）和糊瓷（Paste porcelain）烧制和抛光后的瓷片进行颜色研究。测量结果直接记录在相对于CIE标准光源D65的L^*a^*b^*坐标中。计算并比较PP和PO试样的色差fⅱE，了解其颜色稳定性。颜色测量后，对每个试样进行显微硬度测试，使用显微硬度试验机（MVK-G2， AKASHI， JAPAN）测量维氏硬度。从这些实验结果中我们可以得出结论，与传统的粉末陶瓷相比，膏瓷层状陶瓷具有相似或略高的抗折强度、相似的颜色稳定性和显微硬度。这意味着新开发的糊瓷可用于全瓷修复。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