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首页> 外文期刊>The Journal of Prosthetic Dentistry >Hardness of celluloid strip-finished or polished composite surfaces with time.
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Hardness of celluloid strip-finished or polished composite surfaces with time.

机译：赛璐strip带状表面或抛光复合表面的硬度随时间变化。

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STATEMENT OF PROBLEM: An in-vitro study revealed that a celluloid strip-finished composite surface discolored more than the polished composite surface. Thus, the celluloid strip-finished composite surface may not cure enough compared with the polished composite surface. PURPOSE: This study tested the hypothesis that the celluloid strip-finished composite surface did not cure enough compared with the polished composite surface. METHODS AND MATERIAL: The composite was placed in a 1.5-mm thick aluminum mold and the upper surface was covered with a celluloid strip. Composite was light cured for 60 seconds, then a layer of approximately 200 microm thick was ground away from the lower surface and polished. The hardness of the upper composite surface that was polymerized under a celluloid strip and the polished lower surface were measured with Vickers hardness measuring instrument 15 minutes, 6 hours, and 6 days after light curing. The hardnesses of polished and celluloid strip-finished surfaces were compared using a paired t test. One-way ANOVA and Tukey was used for tests for the significant differences in hardnesses between 15 minutes, 6 hours, and 6 days after light curing for a given surface. RESULTS: Microhardness of the celluloid strip-finished composite surface was 380.6 N/mm(2) at 15 minutes, 442.5 N/mm(2) at 6 hours, and 519.2 N/mm(2) at 6 days after light curing. Microhardnesses of the polished composite surface was 476.6 N/mm(2) at 15 minutes, 511.7 N/mm(2) at 6 hours, and 535.0 N/mm(2) at 6 days after light curing. The hardness of the celluloid strip-opposed composite surface was significantly lower than that of the polished surface 15 minutes and 6 hours after light curing (P <. 001). There was no difference in hardness between the celluloid strip-opposed surface and the polished surface on the sixth day. CONCLUSION: The hardness of the celluloid strip-opposed composite surface was lower than that of the polished surface at 15 minutes and at 6 hours after light curing. However, there was no difference in microhardness in 6 days.
机译：问题陈述：一项体外研究显示，赛璐strip条状表面处理后的复合材料表面比抛光后的复合材料表面更易变色。因此，与抛光的复合物表面相比，赛璐strip条完成的复合物表面可能无法充分固化。目的：本研究检验了以下假设：与抛光复合表面相比，赛璐strip带状复合表面未完全固化。方法和材料：将复合材料放入1.5毫米厚的铝制模具中，其上表面覆盖有赛璐strip带。将复合物光固化60秒，然后从下表面研磨掉约200微米厚的层并抛光。在光固化后15分钟，6小时和6天，用维氏硬度测量仪测量在赛璐strip条下聚合的上复合表面和抛光的下表面的硬度。使用成对t检验比较抛光和赛璐strip带状表面的硬度。对于给定的表面，在光固化后15分钟，6小时和6天之间，单向ANOVA和Tukey用于测试硬度的显着差异。结果：光固化后，赛璐strip带状复合表面的显微硬度在15分钟时为380.6 N / mm（2），在6小时时为442.5 N / mm（2），在6天时为519.2 N / mm（2）。光固化后，抛光后的复合材料表面的显微硬度在15分钟时为476.6 N / mm（2），在6小时时为511.7 N / mm（2），在6天后为535.0 N / mm（2）。光固化后15分钟和6小时，赛璐strip带状对置复合表面的硬度明显低于抛光表面的硬度（P <。001）。在第6天，赛璐strip条相对的表面和抛光的表面之间的硬度没有差异。结论：光固化后15分钟和6小时，赛璐strip带状复合材料表面的硬度低于抛光表面的硬度。但是，在6天内显微硬度没有差异。

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