Almuallem Zahra, McDonnell Sinead, Busuttil-Naudi Antoniella, Santini Ario
University of Edinburgh.
Locum Consultant in Paediatric Dentistry, Sheffield Teaching Hospitals, NHS Foundation Trust.
Eur J Prosthodont Restor Dent. 2016 Dec;24(4):203-214. doi: 10.1922/EJPRD_1576Almuallem12.
The aims of this study were to assess the light energy transmission and Vickers hardness (VH) ratio of two bulk-fill resin-based composites (RBCs) (Tetric EvoCeram and Filtek) cured at different distances between the light curing unit's (LCU) tip and the surface of the restoration (T-S) using either a Bluephase G2, Bluephase® 'turbo tip' or Bluephase Style LCU. Samples were cured from the top at T-S distances of 2mm, 6mm and 10mm for 20 seconds. A MARC-Resin-Calibrator™ recorded the transmitted irradiance reaching the bottom of the sample, in real time. The VH was measured at the top and bottom after 24h of dark storage. Both the total light energy (TLE) transmitted through the samples and their VH ratios were reduced with increasing T-S distance. At 10mm T-S distance, the VH ratio values of samples cured with Bluephase G2 LCU were significantly greater than the samples cured with the other LCUs while the samples cured with Bluephase® 'turbo tip' showed the lowest values. It can be concluded that TLE transmitted through bulk-fill RBCs and their VH ratio reduces with increasing T-S distance but the rate of decline is LCU dependent. Bluephase G2 was associated with the smallest light attenuation.
本研究的目的是评估使用Bluephase G2、Bluephase®“涡轮头”或Bluephase Style光固化机（LCU）在光固化机尖端与修复体表面（T-S）之间的不同距离处固化的两种大块充填树脂基复合材料（RBCs）（Tetric EvoCeram和Filtek）的光能传输和维氏硬度（VH）比。样品在T-S距离为2mm、6mm和10mm处从顶部固化20秒。MARC-Resin-Calibrator™实时记录到达样品底部的透射辐照度。在黑暗储存24小时后，在顶部和底部测量VH。随着T-S距离的增加，透过样品的总光能（TLE）及其VH比均降低。在T-S距离为10mm时，用Bluephase G2 LCU固化的样品的VH比值显著高于用其他LCU固化的样品，而用Bluephase®“涡轮头”固化的样品显示出最低的值。可以得出结论，透过大块充填RBCs的TLE及其VH比随着T-S距离的增加而降低，但下降速率取决于LCU。Bluephase G2的光衰减最小。
