Department of Prosthodontics Dentistry, School of Dentistry, Pusan National University, Yangsan, Korea.
Lasers Med Sci. 2012 Jul;27(4):729-33. doi: 10.1007/s10103-011-0964-4. Epub 2011 Jul 24.
This study evaluated the microhardness and polymerization shrinkage of flowable resins that are cured using different light sources. Seven flowable resins and two light sources (diode-pumped solid-state (DPSS) laser (LAS) and Optilux 501 (OP)) were chosen for the study. To evaluate the microhardness, a mold (height: 2 mm, inner diameter: 4 mm) was filled with resin and then light cured. The microhardness was measured at the top and bottom surfaces after aging for 24 h. The level of polymerization shrinkage was evaluated for 130 s (during and after the light curing) by measuring the dimensions of the cylindrical shape resin filling. The light intensity of the LAS and OP was approximately 520 mW/cm(2) and 800 mW/cm(2), respectively. The data for the microhardness and polymerization shrinkage were analyzed statistically. The microhardness (Hv) of the specimens at the top and bottom surface ranged from 25.3 ± 0.6 to 55.3 ± 1.0 and 28.0 ± 2.6 to 63.0 ± 2.3, respectively. Admira flow, Grandio flow, and Filtek Z350 flow showed a slightly higher microhardness at the bottom surface than that at the top surface. The degree of polymerization shrinkage (μm) of the specimens ranged from 30.5 ± 1.3 to 45.9 ± 0.6 for LAS and from 35.1 ± 1.5 to 47.1 ± 1.0 for OP. The values obtained using LAS and OP showed a statistical difference, but in many cases, the difference between the absolute values was minor.
本研究评估了使用不同光源固化的流动树脂的显微硬度和聚合收缩率。选择了七种流动树脂和两种光源（二极管泵浦固态（DPSS）激光（LAS）和 Optilux 501（OP））进行研究。为了评估显微硬度，将模具（高度：2 毫米，内径：4 毫米）充满树脂，然后进行光固化。在老化 24 小时后，在顶部和底部表面测量显微硬度。通过测量填充圆柱形树脂的尺寸，评估聚合收缩率在 130 秒（光固化期间和之后）的水平。LAS 和 OP 的光强度分别约为 520 mW/cm(2)和 800 mW/cm(2)。对显微硬度和聚合收缩率的数据进行了统计学分析。顶部和底部表面的试件显微硬度（Hv）范围为 25.3 ± 0.6 至 55.3 ± 1.0 和 28.0 ± 2.6 至 63.0 ± 2.3。Admira flow、Grandio flow 和 Filtek Z350 flow 在底部表面的显微硬度略高于顶部表面。LAS 的试件聚合收缩率（μm）范围为 30.5 ± 1.3 至 45.9 ± 0.6，OP 的范围为 35.1 ± 1.5 至 47.1 ± 1.0。LAS 和 OP 得到的值存在统计学差异，但在许多情况下，绝对值之间的差异较小。
