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首页> 外文期刊>The Journal of Prosthetic Dentistry >Influence of ceramic and cement thickness on the masking of various types of opaque posts.
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Influence of ceramic and cement thickness on the masking of various types of opaque posts.

机译：陶瓷和水泥厚度对各种类型的不透明柱的掩膜的影响。

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STATEMENT OF PROBLEM: Dark-colored posts may negatively affect the esthetics of all-ceramic single unit crowns as the thin layers of luting cement may not be sufficiently opaque. PURPOSE: This in vitro study evaluated the influence of the color of 2 commercially available nonmetallic opaque posts (carbon fiber and zirconia) and an experimental esthetic post, and the shade and thickness of luting cements on the esthetics of all-ceramic restorations.Material and methods: Sample disks at several thickness values were made in glass-ceramic (IPS-Empress), an experimental ceramic, a zirconia, a carbon fiber post material, a resin composite material (Z100) as reference, and a luting cement (Variolink II). A laboratory procedure, with 3 possible combinations of stapling the disks, was used. This was performed for 4 substrates, 3 cement colors at 2 thickness values, and 3 heights of ceramic disks. For each combination, the shift in color was measured with a spectrophotometer. Readings were performed for 3 conditions: (1) ability of ceramic to mask the aspect of the abutment in relation to its thickness (1.0, 1.5, or 2.0 mm); (2) effect of a change in cement color (W, Y, or B) on the final color of the ceramic; and (3) influence of cement film thickness (0.1 or 0.2 mm) on the final color of the ceramic. RESULTS: When ceramic thickness was 1 mm, all other variables were visually appreciable. For ceramic thickness of 1.5 mm, color differences decreased and most differences were appreciable only with laboratory instruments. For ceramic thickness of 2.0 mm, there were no detectable, clinically relevant differences. CONCLUSION: The final esthetic result of the all-ceramic IPS-Empress glass-ceramic restoration was not affected by the presence of different substrates with different colors when the thickness was more than 2.0 mm. When ceramic thickness decreases to 1.5 mm, it is advised to take the substrate aspects into consideration. If the ceramic thickness is less than 1.0 mm, the use of a full ceramic crown is contraindicated because color matching of the abutment is required to ensure an acceptable esthetic result. Differences in cement thickness (0.1 or 0.2 mm) may slightly affect the final result. As this parameter can be controlled by the operator only to a certain extent, it cannot be considered as a procedure to correct color. Availability of different cement shades allows only minor esthetic corrections, which might be instrumentally detectable but are clinically not relevant.
机译：问题陈述：深色的立柱可能会对全陶瓷单冠的美学产生负面影响，因为胶结水泥的薄层可能不够透明。目的：这项体外研究评估了2种市售非金属不透明柱（碳纤维和氧化锆）和实验性美学柱的颜色，以及粘固剂的阴影和厚度对全瓷修复体美学的影响。方法：在玻璃陶瓷（IPS-Empress），实验陶瓷，氧化锆，碳纤维桩材料，树脂复合材料（Z100）和参考水泥（Variolink II）中制作了几个厚度值的样品盘）。使用了一种实验室程序，其中有3种可能的装订磁盘组合。这是针对4种基材，3种水泥颜色（2种厚度值）和3种高度的陶瓷盘进行的。对于每种组合，用分光光度计测量颜色变化。在以下三个条件下进行读数：（1）陶瓷掩盖基台相对于其厚度（1.0、1.5或2.0 mm）的外观的能力; （2）改变水泥颜色（W，Y或B）对陶瓷最终颜色的影响; （3）水泥膜厚度（0.1或0.2mm）对陶瓷最终颜色的影响。结果：当陶瓷厚度为1 mm时，所有其他变量在视觉上都是可观的。对于1.5 mm的陶瓷厚度，色差减小，并且大多数色差仅在实验室仪器下才可察觉。对于2.0毫米的陶瓷厚度，没有可检测的临床相关差异。结论：当厚度大于2.0 mm时，全陶瓷IPS-Empress玻璃陶瓷修复体的最终美学效果不受存在不同颜色的不同基底的影响。当陶瓷厚度减小到1.5 mm时，建议考虑基材的方面。如果陶瓷厚度小于1.0毫米，则禁止使用完整的陶瓷牙冠，因为需要对基台进行颜色匹配以确保获得可接受的美学效果。水泥厚度的差异（0.1或0.2毫米）可能会稍微影响最终结果。由于该参数只能由操作员在一定程度上控制，因此不能视为校正颜色的过程。不同水泥阴影的可用性仅允许进行较小的美学校正，这可以通过仪器检测到，但在临床上不相关。

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