Curing-light intensity and depth of cure of resin-based composites tested according to international standards
Curing-light intensity and depth of cure of resin-based composites tested according to international standards
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DOI：
10.14219/jada.archive.2002.0200
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发表时间：
2002-04-01
影响因子：
3.9
通讯作者：
Eichmiller, FC
中科院分区：
文献类型：
--
作者：
Fan, PL;Schumacher, RM;Eichmiller, FC
背景几个因素控制树脂基复合材料的光固化：复合材料的组成、复合材料的色度、固化光的波长和带宽、光与复合材料的距离、固化光的强度和照射时间。作者研究了五种品牌树脂基复合材料的几种色调的固化深度，这些树脂基复合材料在国际标准化组织（ISO）推荐的强度为300毫瓦/平方厘米的400至515纳米波长带宽的光照射下固化。将树脂基复合材料照射产品制造商推荐的时间。作者使用调节为在400-nm至515-nm波长带宽内发射300 mW/cm（2）的固化光来照射每种复合物品牌类型和色调的五个样品。他们使用ISO树脂基复合材料标准中描述的刮擦方法测量固化深度。固化深度定义为在通过手动刮除未固化材料之后复合材料试样长度的50%。作者确定了每个复合品牌和色调的五个样本的平均值。21种复合材料中有13种（62%）达到了ISO标准的固化深度要求（1.5毫米）。当作者将产品制造商推荐的辐照时间加倍时，其余8种材料中有6种达到了固化深度要求。当使用适当的固化时间时，强度为300 mW/cm（2）的固化灯似乎可以有效地固化大多数树脂基复合材料，在某些情况下，固化时间比制造商推荐的时间长。牙医应验证复合材料的固化深度作为基线测量，然后定期检查固化深度以确认光和材料性能。ISO固化深度测量方法可用于此目的。
Background. Several factors control the light curing of a resin-based composite: the composition of the composite, the shade of the composite, the wavelength and bandwidth of the curing light, the distance of the light from the composite, the intensity of the curing light and the irradiation time. The authors investigated the depth of cure of several shades of five brands of resin-based composites when irradiated via light in the 400- to 515-nanometer wavelength bandwidth at the International Organization for Standardization, or ISO, recommended intensity of 300 milliwatts per square centimeter. The resin-based composites were irradiated for the times recommended by the products' manufacturers.Methods. the authors used a curing light adjusted to emit 300 mW/cm(2) in the 400-nm to 515-nm wavelength bandwidth to polymerize five samples of each composite brand type and shade. They measured depth of cure using a scraping method described in the ISO standard for resin-based composites. Depth of cure was defined as 50 percent of the length of the composite specimen after uncured material was removed by manual scraping. The authors determined a mean from the five samples of each composite brand and shade.Results. Thirteen (62 percent) of 21 composite materials met the ISO standard depth-of-cure requirement of 1.5 millimeters. Six of the eight remaining materials met the depth-of-cure requirement when the authors doubled the irradiation time recommended by the product manufacturers.Conclusions and Clinical implications. Curing lights with an intensity of 300 mW/cm(2) appear to effectively cure most resin-based composite materials when appropriate curing times are used, which, in some cases, are longer than those recommended by the manufacturers. Dentists should verify the depth of cure of a composite material as a baseline measure, and then check depth of cure periodically to confirm light and material performance. The ISO depth-of-cure measurement method can be used for this purpose.