不同瓷系统对金瓷修复体颜色的影响

目的探讨不同瓷系统对金瓷修复体颜色的影响.方法用Ni-Cr非贵金属体系烤瓷合金(德国)制作金属基底,选用Vita VMK 95 METALL KERAMIK A2瓷粉和Shofu Vintage A2瓷粉这2种不同系统的瓷粉,在相同的金属基底上分别制作金瓷试件(金属基底厚为0.3mm,遮色瓷厚度为0.2mm,瓷厚度为1mm).用Shde eye EX(松风,日本)电脑比色仪检测试件的颜色.结果①2种不同瓷系统对金瓷修复体的颜色、色相、和明度均无影响(P＞0.05).②2种不同瓷系统对金瓷修复体的彩度(饱和度)有影响,并有显著差异(p＜0.01).结论Vita和Shofu这2种瓷粉颜色之间比较,除了Shofu系列瓷粉的彩度比Vita瓷粉高外,颜色的明度和色相无明显的差异.如要增加金瓷修复体颜色的彩度,可选用Shofu系列瓷粉,以达到再现自然牙颜色的目的.     

牙本质瓷厚度对Ni-Cr合金烤瓷修复体颜色的影响

目的 探讨牙本质瓷厚度对金属烤瓷修复体颜色的影响.方法 用SHOFU Vintage Halo A2色牙本质瓷粉制作牙本质瓷为不同厚度(0.3mm、0.6mm、0.9mm、1.2mm、1.5mm)的金属烤瓷试件,用色度计测量试件的L*、a*、b*值,并计算其⊿E 和C*ab.比较试件颜色与VITA A2色比色片颜色的差...     

3种不同背景对金瓷修复体颜色的影响

目的比较3种不同背景下金瓷修复体之间及其与Vitapanclassical比色板的色彩差异。方法应用CIE1976L*a*b*颜色系统,采用高像素数码摄影及计算机处理技术,在标准光源及相同条件下,采集了2组金瓷修复体的12个试件与6个A2比色片的图片,分别测量、分析其色度值。结果同种金瓷修复体在3种不同背景之间的色度差明显大于1.5NBS;在灰色背景下金瓷修复体与比色片的色度差最小。结论3种不同背景下金瓷修复体之间及其与VITA比色板存在肉眼可见的颜色差异,灰色背景要优于其他两种。     

影响金属烤瓷修复体颜色的临床因素

金属烤瓷修复体的色彩再现一直是口腔修复领域的一个难题,随着金属烤瓷修复体的广泛应用,色彩问题也成为研究的热点。本文就可能影响金属烤瓷修复体颜色效果的一些临床因素作一综述。     

不同龈瓷对金属烤瓷修复体颜色的影响

目的了解不同周边牙龈瓷对金属烤瓷修复体颜色的影响,为临床陶瓷类修复体的正确比色及颜色的准确展现提供实验依据。方法利用A2及A4色体瓷与深、浅牙龈瓷分别组合制作实验组试件,利用A2及A4色体瓷制作相应对照组试件,以分光光度计测试有无龈瓷的实验组及相应对照组试件的颜色。结果体瓷在牙龈瓷周边色的影响下,与原体瓷对照组色度值相比,L＊值降低、a＊值增加、b＊值减小、C＊ab降低、H0ab降低,所有色度值变化均具有统计学意义（P〈0.05）。结论周边牙龈瓷对金属烤瓷修复体颜色有影响,龈瓷颜色不同,对体瓷影响也不同。     

多次烧结遮色瓷对金瓷修复体颜色的影响

探讨金属烤瓷修复体颜色匹配和色泽稳定性,提高金瓷修复体质量,一直是临床烤瓷修复面临的重要课题。本实验拟利用光谱扫描色度仪测试多次烧结遮色瓷层后金瓷修复体色相、明度、彩度的变化,探讨烧结变色规律及对金瓷修复体颜色的影响,为临床上金属烤瓷修复体的制作提供实验依据。     

烤瓷修复体崩瓷的修复

烤瓷熔附金属 (ｐｏｒｃｅｌａｉｎ ｆｕｓｅｄ ｔｏ ｍｅｔａｌ)修复体 ,因其良好的生物相容性 ,稳定的理化性能 ,逼真的色泽 ,近年来在我国口腔修复领域得到了广泛应用[1～ 3] 。但烤瓷熔附金属修复体在设计 ,制作和使用过程中如不注意 ,则易造成瓷修复体的瓷裂 (ｐｏｒｃｅ ｌａｉｎｆｒａｃｔｕｒｅ)。如何妥善修复崩瓷 ,各国学者做了大量的研究 ,下面就这方面的研究进展做一综述。金属烤瓷修复体在患者口腔中发生崩瓷后 ,不仅影响患者的美观和功能 ,而且给医生修复崩瓷带来很多不利。早期氰基丙烯酸酯 ,丙烯酸树脂 ,复合树脂都曾用于修…     

3种不同金瓷修复体颜色差异的研究

目的比较3种不同金瓷修复体之间及与Vitapan classical比色板的色彩差异。方法应用CIE1976L*a*b*颜色系统,采用高像素数码摄影及计算机处理技术,在标准光源及相同条件下,采集了24件3种金瓷修复体与A2比色片的样本图片,测量、分析其色度值。结果从颈部到切端,3种金瓷修复体与A2比色片明度值均呈递增趋势,彩度值呈递减趋势;金瓷修复体明度值均高于A2比色片的明度值;色相为黄红色;彩度值不同,修复体较A2比色片偏黄红色;金沉积金瓷修复体明度及彩度高于其他两种。结论3种不同金瓷修复体颈部、体部与VITA比色板存在颜色差异,金沉积烤瓷冠、金合金烤瓷冠在色泽上优于镍铬合金烤瓷冠。     

五种烤瓷合金金瓷结合强度的比较

目的：比较镍铬合金、含钛的镍铬合金、钴铬合金、钯银合金和纯钛的金瓷结合强度。方法：执行ISO9693标准,采用三点弯曲试验分别测定镍铬合金、含钛的镍铬合金、钻铬合金、钯银合金、纯钛在常规热处理条件下的金瓷结合强度。结果：金瓷结合强度分别为：镍铬合金（37．82±2．72）Mpa;含钛的镍铬合金（39．23±2．45）Mpa;钴铬合金（39．06±3．41）Npa;钯银合金（47．98±3．74）Npa;纯钛（32．61±5．62）Mpa。镍铬合金、含钛的镍铬合金、钻铬合金组间差异无统计学意义（P〉0．05）,这3种合金与纯钛、钯银合金组间差异都有统计学意义（P〈0．05）,纯钛与钯银合金组间差异也有统计学意义（P〈0．05）。结论：①镍铬合金、含钛的镍铬合金、钴铬合金金瓷结合强度相近,都大于纯钛且小于钯银合金的金瓷结合强度。②镍铬合金、含钛的镍铬合金、钻铬合金、钯银合金和纯钛的金瓷结合强度都大于25Mpa,按ISO9693标准均可应用于临床。     

陶瓷材料对瓷贴面颜色的影响

目的研究两类三种陶瓷材料对瓷贴面修复颜色的影响,为临床工作中瓷贴面修复体与比色板的颜色匹配性提供指导。方法制作直径10mm、厚度0.7mm的A2色瓷贴面圆盘试件,按陶瓷材料及制作工艺分为无遮色长石质烤瓷组、遮色长石质烤瓷组、IPSe.maxPress铸瓷组3组。每组10个试件,共计30个试件。选择Natural Die Material Shade Guide比色板中的ND4、ND6、ND8三种颜色,分别代表轻、中、重度变色牙底色,采用对应颜色树脂各制作1个底色圆盘。对每个瓷贴面试件分别以3种底色圆盘为基牙底色,采用Vita Easyshade电脑比色仪测量瓷贴面修复体的色度值。计算各组瓷贴面修复体与标准比色片A2的色差。结果在轻、中、重度变色牙背景条件下,两种陶瓷材料的瓷贴面修复体与标准比色片A2间色差的比较结果为,IPS e.max Press铸瓷组<无遮色长石质烤瓷组<遮色长石质烤瓷组,差异有统计学意义(P<0.05)。结论采用长石质烤瓷贴面及IPS e.max Press热压铸瓷贴面模拟修复不同程度的变色牙时,热压铸瓷贴面与标准比色片的颜色匹配性高于长石质烤瓷贴面。     

Colorimetric analysis of opaque porcelain fired to different base metal alloys used in metal ceramic restorations

STATEMENT OF PROBLEM: The popularity of base metal alloys has considerably increased in recent years because of their superior mechanical properties as well as the high cost of noble alloys. However, there is disagreement about their effect on the opaque porcelain color and the color differences among base metal alloys. PURPOSE: The purpose of this in vitro study was to determine and compare the influence of various commercially available base metal alloys (excluding titanium-based systems) on the resulting color of opaque porcelain with the use of a colorimetric device. MATERIAL AND METHODS: Fourteen different types of Ni-Cr and 3 different types of Co-Cr porcelain bonding alloys were selected with a Au-Pd alloy (V-Delta SF) as the control group for colorimetric measurements and determination of color shift after opaque application. Shade B1 of an opaque porcelain (IPS d.SIGN Opaquer) was applied (0.1 mm) to all specimens (16 mm x 1 mm). The color coordinates of each specimen were measured with a chromameter. The data were displayed in L*, a*, and b* values according to the CIELAB system, and the color differences (DeltaE) between base metal alloys and the control group were calculated. Data were statistically analyzed with 1-way ANOVA (alpha=.05). The ANOVA was followed by Dunnett's multiple comparison test for comparisons with the control group to determine specifically which groups were significantly different from the control group. RESULTS: The L* value of only 1 base metal alloy was significantly different from the control group (P<.001). All base metal alloy groups except 3 had a* values which were significantly different from the control group a* value (P=.001 for Rexillium III, P=.008 for Heracles N, and P<.001 for the remaining 12 alloys), whereas only 3 base metal alloys were not statistically significantly different from the control group in the means of b* values (P<.001). All base metal alloys to which opaque porcelain was applied had significantly different DeltaE values in comparison with the control group (P<.001). CONCLUSIONS: The data of the study indicated that a 0.1-mm-thick layer of opaque porcelain applied on the Ni-Cr and Co-Cr alloys did not reliably reproduce the color of opaque porcelain. However, within the limitations of this study, the color differences of base metal alloys measured according to the control group are within clinically acceptable limits (DeltaE<3.5).     

Effect of different metal ceramic alloys on the color of opaque and dentin porcelain

Certain metal ceramic alloys alter the final color of bonded porcelain. Contradicting results, inconsistent test designs, and incomplete alloy selections have led to some confusion. In this study, differential colorimetric analysis was done at the opaque and dentin porcelain stages with five major types of metal ceramic alloys. The color stability of the porcelain on the high-noble metal alloys was found to be excellent. The palladium-silver and nickel-chromium alloys resulted in significant color changes of the dentin porcelain only. The greatest changes in color were found with the palladium-silver alloy, which resulted in a higher yellow-green saturation. The nickel-chromium alloy also produced a color change, although not as severe, resulting in a porcelain shade with a reduced Value or lightness.     

Marginal adaptation of porcelain margins in metal ceramic restorations.

The purpose of this study was to evaluate the marginal adaptation of all-porcelain labial margin metal ceramic crowns using a porcelain shoulder material containing a light-polymerizing resin and one that used a direct-lift technique. Conventional metal margin restorations served as controls. Scanning electron micrographs were made of a 1-mm mesiodistal width of the margin at midfacial and midlingual reference marks. Image processing and analysis techniques were accomplished using a computer. Statistical evaluation indicated that the mean labial marginal discrepancy of the control group was significantly less than that of either of the two porcelain shoulder methods.     

Evaluating porcelain color match of different porcelain shade-matching systems

PURPOSE: This in vitro study was designed to evaluate the new ShadeEye-EX Chroma Meter and a new visual porcelain shade-matching system (Vitapan 3-D Master, Omega 900) in comparison to the traditionally used visual porcelain shade-matching system (Vita Lumin Vacuum, VMK 68). MATERIALS AND METHODS: Shade matches and porcelain fabrications on individualized shade tabs were carried out. The fabricated porcelain tabs were evaluated against the respective natural tooth using the United States Public Health Service (USPHS) criteria to determine clinically acceptable match. The tabs also were ranked according to the final-color match to the corresponding natural tooth. RESULTS: The percentage of clinically acceptable color matches were as follows: Vita Lumin Vacuum (46.67%), ShadeEye-EX (40%), and Vitapan 3-D Master (56.67%). The generalized estimating equation (alpha = 0.5) showed no statistically significant difference between systems in obtaining a clinically acceptable match (p = .5729). The chi-squared test (alpha = 0.5) showed no statistically significant difference between systems in terms of rank order (p = .5017). The two new systems do not produce color match that is better than the conventional visual porcelain shade-matching system.     

The effects of manipulative variables on the color of ceramic metal restorations

Certain variables were tested for their influence on the color of ceramic metal restorations. The variables included firing temperature, condensation technique, modeling liquid, and brand of porcelain. In addition, the color of different nominal shades was compared. The color was measured with a Minolta CR-121 small-area colorimeter. The small (7 mm2) measuring area enabled readings to be made on actual crown specimens rather than disks. The results were expressed in the CIELAB color system enabling comparisons to be made related to visual perception. The following conclusions can be drawn from the study. 1. The small-area colorimeter is able to detect statistically significant and perceivable color differences between shades of porcelain. The variation in color parameters associated with making replications of a restoration is significantly greater than the error associated with making repeated color measurements of the same restoration. 2. Restorations made with the different brands of porcelain studied have noticeably different colors despite having the same nominal shade. 3. Color changes caused by the choice of modeling liquid were not statistically significant in this study. If the mean color differences are truly representative, using Rainbow or Carv-eze modeling liquids with Vita VMK porcelain may produce color changes that are just barely detectable. 4. The manipulative variables of firing temperature and condensation have little influence on the color of the restorations.