Effect of low-temperature degradation and sintering protocols on the color of monolithic zirconia crowns with different yttria contents.

IF 1.9 4区医学 Q2 DENTISTRY, ORAL SURGERY & MEDICINE Dental materials journal Pub Date : 2024-03-29 Epub Date: 2024-01-31 DOI:10.4012/dmj.2023-194

Shoko Miura, Akikazu Shinya, Hiroyasu Koizumi, Pekka Vallittu, Lippo Lassila, Masanori Fujisawa

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Abstract

This study investigated the effects of low-temperature degradation (LTD) on the L*, a*, and b* values of highly translucent zirconia crowns. Four types of zirconia disks with different yttria contents (IPS e.max ZirCAD LT, IPS e.max ZirCAD MT, IPS e.max ZirCAD MT Multi, IPS e.max ZirCAD Prime, Ivoclar) and two shades (A2 and BL) were used. A crown was manufactured using four types of zirconia and LTD treated. Color measurements were performed, and the color difference (ΔE₀₀) before and after LTD was calculated. The microstructure was determined through X-ray fluorescence and X-ray diffractometry. Highly translucent zirconia crowns showed greater changes in the a* and b* values than in the L* value after LTD, regardless of the shade. The Multi2 crowns exhibited a discernible color change due to the LTD treatment. The X-ray fluorescence results did not reveal any apparent change in the microstructure between sintering programs for all zirconia specimens.

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低温降解和烧结方案对不同钇含量的整体氧化锆冠颜色的影响。

本研究调查了低温降解（LTD）对高透光氧化锆冠的 L*、a* 和 b* 值的影响。研究使用了四种不同钇含量的氧化锆盘（IPS e.max ZirCAD LT、IPS e.max ZirCAD MT、IPS e.max ZirCAD MT Multi、IPS e.max ZirCAD Prime，Ivoclar）和两种色调（A2 和 BL）。使用四种氧化锆制造牙冠，并经 LTD 处理。进行了颜色测量，并计算了LTD前后的色差（ΔE00）。通过 X 射线荧光和 X 射线衍射测定法确定了微观结构。高透光性氧化锆牙冠在LTD后的a*和b*值的变化大于L*值的变化，而与色调无关。Multi2牙冠在LTD处理后出现了明显的颜色变化。X 射线荧光结果显示，所有氧化锆试样在不同烧结程序之间的微观结构都没有明显变化。

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来源期刊

Dental materials journal 医学-材料科学：生物材料

CiteScore

4.60

自引率

4.00%

发文量

102

审稿时长

3 months

期刊介绍： Dental Materials Journal is a peer review journal published by the Japanese Society for Dental Materials and Devises aiming to introduce the progress of the basic and applied sciences in dental materials and biomaterials. The dental materials-related clinical science and instrumental technologies are also within the scope of this journal. The materials dealt include synthetic polymers, ceramics, metals and tissue-derived biomaterials. Forefront dental materials and biomaterials used in developing filed, such as tissue engineering, bioengineering and artificial intelligence, are positively considered for the review as well. Recent acceptance rate of the submitted manuscript in the journal is around 30%.