Dureza knoop de resinas compostas em função do número relativo de radicais livres

Marco Aurelio Reis Lima Menezes, A. Muench
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引用次数: 8

Abstract

The present study had the purpose of determining the relative number of free radicals of three composites with clear and dark colors. Intensities of irradiation were: 110, 180, 300, and 580 mW/cm2, for 10, 20, 30, 40, 50, 60, 80 and 90 seconds. Hardness was determined for the clear colors of the composites, using 110 and 300 mW/cm2 irradiation intensities, for 20, 40, 60, and 80 seconds, on front and deep surfaces, at the ages of 5 minutes, 1 hour, 1 day, 1 week, and 1 month. The conclusions were that: depending on the resin, clear colors present more free radicals; the number of free radicals increases with higher intensity and longer irradiation time; composite Z100 is much richer in free radicals than Silux Plus and Heliomolar RO; higher intensity of irradiation leads to increasing hardness; longer irradiation time increases hardness of Silux Plus and Heliomolar RO, but not that of Z100; hardness increases with age; in depth hardness is very low; Z100 is much harder than the other two resins; Z100 is less sensitive to irradiation intensity.
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复合树脂的努普硬度与相对自由基数的关系
本研究的目的是测定三种颜色分别为明暗两种颜色的复合材料的相对自由基数。辐照强度分别为:110、180、300和580 mW/cm2,辐照时间分别为10、20、30、40、50、60、80和90秒。在5分钟、1小时、1天、1周和1个月的时间内,使用110和300 mW/cm2辐照强度,分别对复合材料的正面和深层表面进行20、40、60和80秒的辐照,以测定其清晰颜色的硬度。结论是:根据树脂的不同,颜色清晰的树脂呈现出更多的自由基;辐照强度越大,辐照时间越长,自由基数量越多;复合材料Z100的自由基含量远高于Silux Plus和Heliomolar RO;辐照强度越大,硬度越大;较长的辐照时间增加了Silux Plus和Heliomolar RO的硬度,但对Z100没有影响;硬度随龄期增加;在深度硬度很低;Z100比其他两种树脂硬得多;Z100对辐照强度不太敏感。
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