| 摘要: | 在臨床上，全瓷冠?復物治療常常會需要將牙齒修磨成支台齒的形狀，或是使用植體取代牙齒再戴上製作好的全瓷冠，然而，在長期的臨床觀察下，發現全瓷冠會因支台齒的顏色漸漸變深，而在陶瓷較薄的齒齦交界處透出，讓全瓷冠的美觀性下降，此論文研究之目的為探討顏色過深之支台齒使用了內層上金之二氧化鋯全瓷冠後，是否可以提升遮色效果，進而解決此問題。
本研究使用A2色二氧化鋯瓷塊作為材料，將瓷塊切削、依廠商提供之燒結參數燒結，製作出長寬皆為1.0cm正方形，且厚度為0.5、0.7、0.9、1.1mm的樣品，再在二氧化鋯內層加上金屬，樣品隨即進行噴砂處理，每個厚度之瓷塊分組為上金0層、1層與2層之組別。
樣品製作完後先進行X光繞射法分析使用材料之結晶特性，再將樣品置於白色、18度灰、黑色之色卡上，用比色機檢測各樣品之CIE L*a*b*值並分析樣品的△E顏色差異值，討論二氧化鋯瓷塊上金與否以及背景顏色對樣品顏色的影響。
實驗結果顯示：二氧化鋯的厚度會影響二氧化鋯的顏色，二氧化鋯厚度越厚，則顏色明度越低，色度會往紅色與黃色色調偏移；背景顏色對二氧化鋯有較大的影響，背景顏色越深，L*、a*、b*值下降越多，讓二氧化鋯樣品的明度、色度下降；上金後會影響二氧化鋯本身的明度，但上金確實有良好的遮色的效果，而用來遮色的上金層需要一定厚度才能具有良好的遮色效果，在口腔?復物的應用上有很好的潛力。
In clinical application, prosthodontic treatment using full-porcelain crown tends to prepare the natural tooth into abutment, or placing implant to attach the prosthesis. If the abutment color becomes dark after long-term usage, the aesthetics of the full-porcelain crown worsens. The purpose of this study is to investigate whether coating a thin layer of gold can improve the shading ability of full ceramic zirconia crown when applied on dark color abutment tooth.
In this study, we fabricated the sample by cutting the zirconia block into rectangular shape, followed by sintering and samples with a size of 10 x 10 mm2, and various thickness (0.5, 0.7, 0.9, and 1.1 mm) can be prepared. After sandblasting, gold inner layer(s) were deposited. The samples were divided into three major groups (0,1,2 layers of gold) and each major group contained four minor groups (0.5, 0.7, 0.9, and 1.1mm).
The X-ray diffraction analysis was first performed, followed by thickness measurement, and at last the CIE L*a*b* color parameters were obtained by plating the samples on three different background color (white, grey, and black) using a colorimeter. The color differences among samples with different background colors, thicknesses of zirconia, and with/without gold inner layer(s) were evaluated.
The results showed that the thickness of zirconia affected the color of zirconia. The larger the thickness, the smaller the L* value. The chroma will
shifted to red and yellow color. Background color have significant impact on the sample color parameters. The deeper the background color, the larger the impact. Gold plated samples showed more resistance to the effect of the deep background color. Zirconia with a thick-enough gold inner layer revealed good shading effects and high potential to be use on dental prostheses. |
