Relationships between conversion, temperature and optical properties during composite photopolymerization.
Relationships between conversion, temperature and optical properties during composite photopolymerization.
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DOI：
10.1016/j.actbio.2009.11.006
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发表时间：
2010-06
影响因子：
9.7
通讯作者：
Stansbury, Jeffrey W.
中科院分区：
文献类型：
--
作者：
Howard, Benjamin;Wilson, Nicholas D.;Newman, Sheldon M.;Pfeifer, Carmem S.;Stansbury, Jeffrey W.
固化和未固化的复合材料固化剂的光学性质在依赖于光活化的过程中具有明显的重要性，因为它们可能影响光透射，从而影响机械性质和最终临床性能所依赖的材料转化。本研究的目的是评估同时，实时转换，温度和光学性能的发展。在三种填料负载（分别为0、35或70质量% -无填充、低填充和高填充）与三种引发剂浓度（CQ/EDMAB：0/0、0.2/0.8或1.0/1.6质量%）组合下制备二甲基丙烯酸酯树脂（BisGMA / TEGDMA 70/30质量%）。将样本暴露于低（50 mW/cm 2）或高（500 mW/cm 2）辐照度。在整个聚合过程中进行同时的转化率（近红外峰面积）、温度（热电偶）和可见光透射率（紫外-可见光谱）测量。树脂的折射率随转化率线性上升（r2 = 0.976），在这些材料中在约58%转化率下产生树脂/填料之间的折射率匹配。转化过程中透光率的百分比增加对于增加填料水平更大。较高的CQ含量导致在略高的转化水平下的最大光透射率（对于高填充材料和低填充材料分别为60- 65%和50- 55%）。填料浓度的广泛分布允许临床相关的概括，即高度填充的复合材料不仅危害绝对光透射率，转化率和固化深度，而且还表明材料，加工条件和牙科复合材料的光学性能之间存在复杂的相互关系。
Optical properties of composite restoratives, both cured and uncured, are of obvious importance in a procedure reliant on photoactivation, since they may affect light transmission and therefore, materials conversion upon which mechanical properties and ultimate clinical performance are dependent. The objective of the present study was to evaluate simultaneous, real-time conversion, temperature and optical properties development. The dimethacrylate resin (BisGMA / TEGDMA 70/30 mass %) was prepared at three filler loading (0, 35 or 70 mass % - no fill, low and high fill, respectively) combined with three initiator concentrations (CQ/EDMAB: 0/0, 0.2/0.8 or 1.0/1.6 mass %). Specimens were exposed to either low (50 mW/cm2) or high (500 mW/cm2) irradiance. Simultaneous conversion (near-IR peak area), temperature (thermocouple) and visible light transmission (UV-Vis spectroscopy) measurements were conducted throughout the polymerization process. The refractive index of the resin rises linearly with conversion (r2 = 0.976), producing a refractive index match between resin/filler at approximately 58 % conversion in these materials. The percentage increase in light transmission during conversion was greater for increasing filler levels. Higher CQ content led to maximum light transmission at slightly higher levels of conversion (60-65 and 50-55 % for the high and low filled materials, respectively). The broad distribution of filler concentrations allows for the clinically relevant generalization that highly filled composites not only jeopardize absolute light transmission, conversion and depth of cure, but also demonstrates the complex interrelationship that exists between materials, processing conditions and the optical properties of dental composites.
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影响因子：
2.5
作者：
Fujita, K;Nishiyama, N;Ikemi, T
通讯作者：
Ikemi, T
影响因子：
5
作者：
Mucci, Veronica;Arenas, Gustauo;Vallo, Claudia
通讯作者：
Vallo, Claudia
影响因子：
4.6
作者：
Shibayama, M;Ozeki, S;Norisuye, T
通讯作者：
Norisuye, T
影响因子：
7.6
作者：
SUZUKI, H;TAIRA, M;YAMAKI, M
通讯作者：
YAMAKI, M
影响因子：
7.6
作者：
Shortall, A. C.;Palin, W. M.;Burtscher, P.
通讯作者：
Burtscher, P.