Siagian Juliana S, Dennis Dennis, Ikhsan Tulus, Abidin Trimurni
Department of Conservative Dentistry, Faculty of Dentistry, Universitas Sumatera Utara, Medan, Indonesia.
Department of Conservative Dentistry, Faculty of Dentistry, Universitas Sumatera Utara, Medan, Indonesia, Phone: +62 8126555068, e-mail:
J Contemp Dent Pract. 2020 Jun 1;21(6):615-620.
The aim of this study is to compare the effect of the use of second-generation and third-generation LED light-curing units (LCUs) on the degree of conversion (DC) and microhardness (VHN) of bulk-fill resin composites.
Thirty cylindrical specimens (each = 5) of Tetric N-Ceram Bulk-Fill, Filtek™ Bulk-Fill Posterior Restorative, and SDR flow were prepared in metal molds (5 mm in diameter and 4 mm in thickness) and cured with second-generation LED (SmartLite® Focus®, Dentsply Sirona) and third-generation LED (Bluephase® style, Ivoclar Vivadent) resulting in six groups. Degree of conversion was determined using Fourier transform infrared spectroscopy (FTIR), and microhardness with Vickers microhardness tester. Data were statistically analyzed using one-way ANOVA and least significance difference (LSD) test, and DC and microhardness were correlated using Pearson's correlation ( = 0.05).
There was a significant difference between DC and VHN between all groups of bulk-fill which were cured by second-generation LED curing light and third-generation LED curing light. Then there is no significant difference between DC of the three composite bulk-fill resins by (second-generation LED vs third-generation LED curing light).
The second-generation LED curing light can still be used to cure bulk-fill resin composites by increasing the duration of irradiation.
In the microhardness test, there was a significant difference in the Filtek™ Bulk-Fill Posterior Restorative resin composites.
本研究旨在比较使用第二代和第三代发光二极管光固化机（LCU）对大块充填树脂复合材料的转化率（DC）和显微硬度（VHN）的影响。
在金属模具（直径5毫米，厚度4毫米）中制备30个圆柱形试件（每种材料5个），材料分别为Tetric N-Ceram Bulk-Fill、Filtek™ Bulk-Fill Posterior Restorative和SDR flow，并使用第二代发光二极管（SmartLite® Focus®，登士柏西诺德）和第三代发光二极管（Bluephase® style，义获嘉伟瓦登特）进行固化，形成6组。使用傅里叶变换红外光谱（FTIR）测定转化率，使用维氏显微硬度测试仪测定显微硬度。数据采用单因素方差分析和最小显著差（LSD）检验进行统计学分析，DC和显微硬度采用Pearson相关性分析（α = 0.05）。
所有由第二代发光二极管固化灯和第三代发光二极管固化灯固化的大块充填材料组之间，DC和VHN存在显著差异。然后，三种复合大块充填树脂的DC在（第二代发光二极管与第三代发光二极管固化灯之间）没有显著差异。
通过增加照射时间，第二代发光二极管固化灯仍可用于固化大块充填树脂复合材料。
在显微硬度测试中，Filtek™ Bulk-Fill Posterior Restorative树脂复合材料存在显著差异。
