Effect of Distance on Light Transmission Through Polymerized Resin Composite.
Effect of Distance on Light Transmission Through Polymerized Resin Composite.
复制标题
距离对聚合树脂复合材料光传输的影响。
DOI：
10.1922/ejprd_01700aromaa05
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Pekka K. Vallittu
中科院分区：
文献类型：
--
作者：
M. Aromaa;L. Lassila;Pekka K. Vallittu
目标
牙科复合材料的透光率因产品和色调而异，而且光固化单元的辐照度和固化尖端的光纤结构也各不相同。本研究的目的是研究固化尖端到树脂复合材料的距离与树脂复合材料下表面的辐照度之间是否存在线性关系。
材料和方法
制造了 1 毫米厚（6 毫米直径）的圆盘。使用两个光固化装置 Elipar S10 (3M-ESPE) 和 Silverlight (GC) 在距离光尖端 0、2、4、6、8、10 mm 处测量通过圆盘的透光率（强度）。计算辐照度比（没有复合盘/有复合盘的传感器表面的辐照度），并根据光固化尖端的距离绘制。使用协方差分析（ANCOVA，Tukey's，α=0.05）进行统计分析。
结果
Silverlight 的辐照比在 18% 到 24% 之间变化，而 Elipar S10 光固化装置的辐照比在 21% 到 26% 之间变化。光固化头不同距离的比率之间差异有统计学意义（p⟨0.05）。有趣的是，Elipar S10 装置在尖端距离为 4 毫米时发现最高辐照度比，而 Silverlight 装置在尖端距离为 6 毫米时具有最高辐照度比。在两种测试的树脂复合材料中，可流动复合材料表现出比常规可包装树脂复合材料更高的辐照比。
结论
正如预期的那样，增加光固化尖端与复合材料表面的距离会降低复合材料下方的绝对辐照度。然而，似乎存在 4-6 毫米的设备相关最佳距离，以通过复合树脂达到最有效的辐照比，请记住，通过使光固化尖端与材料接触来实现通过材料的最有效的光传输。
OBJECTIVE
Light transmittance of dental composites varies between products and shades, but also light curing units differ to each other in their irradiance and fiber optic structure of curing tip. The aim of this study was to investigate whether there is linear relationship between the distance of the curing tip to the resin composite and irradiance at lower surface of the resin composite.
MATERIALS AND METHODS
Disks of 1 mm thickness (6mm diameter) were fabricated. Light transmittance (intensity) through the disk was measured at distance of 0, 2, 4, 6, 8, 10 mm from the light tip with two light curing units Elipar S10 (3M-ESPE) and Silverlight (GC). Irradiance ratio (irradiance on the sensor surface without the composite disk / with the composite disk) was calculated and plotted against the distance of the light curing tip. Statistical analysis was carried out using analysis of covariance (ANCOVA, Tukey's, α =0.05).
RESULTS
Irradiance ratio varied between 18% to 24% with Silverlight and 21% to 26% with Elipar S10 light curing units. There were statistically significant differences between the ratios with different distances of the light curing tip (p⟨0.05). Interestingly, the highest irradiance ratio for Elipar S10 unit was found with 4 mm distance of the tip, whereas Silverlight unit had the highest ratio with 6 mm distance. Out of two tested resin composites, the flowable composite showed higher irradiance ratio than regular packable resin composite.
CONCLUSIONS
Increase of distance of the light curing tip from the composite surface decreased the absolute irradiance underneath of composite, as expected. However, there seemed to be device dependent optimal distance of 4-6 mm to reach the most efficient irradiance ratio through the composite resin keeping in mind that most efficient transmission of light through the material is reached by having light curing tip in contact to the material.