Besnault Catherine, Pradelle-Plasse Nelly, Picard Bernard, Colon Pierre
Department of Operative Dentistry and Endodontics, Faculté de Chirurgie Dentaire Paris 7, Laboratoire de Biomateriaux Dentaires, 14, rue des Morteaux, 92160 Antony, France.
Am J Dent. 2003 Oct;16(5):323-8.
To evaluate the effect, in vitro, of a LED (GC E Light) versus an halogen (Astralis 7) polymerization on the mechanical properties of three commercially available microhybrid composite resins.
Three commercially available composite resins (Tetric Ceram, Charisma, and Z100), and six modes of polymerization were evaluated (one mode for Astralis (AST): HIP 40 seconds and five modes for the GC E Light (GCE): standard 40 seconds, fast cure 6 seconds, fast cure 12 seconds, soft cure A 39 seconds, and turbo 10 seconds) in terms of top surface and bottom surface (2 mm-depth) microhardness, and flexural strength. Five specimens of each composite resin were made for the two mechanical properties tested. Five hardness values were recorded on each side for each sample with a Vickers diamond indenter. A three point bending test was performed at a crosshead speed of 1 mm/minute. Statistical comparisons were made using a two-way ANOVA (composite resin, polymerization mode) and a Fisher's test (P < 0.05).
Z100 presented highest properties for both tests. Top surface microhardness: for Tetric Ceram and Charisma, the longer the exposure time, the higher the results, with no difference between AST mode and the longer GCE modes. For Z100, the highest values were obtained with AST. Whichever the material, short times (fast cure 6 seconds and turbo) exhibited poor results. Bottom surface microhardness: the samples cured with AST presented higher results but quite similar mechanical properties were achieved with the fast cure 12 GCE mode of the LED LCU. Fast cure 6 seconds and turbo obtained the lowest results. Flexural strength: the results were comparable with those obtained in bottom microhardness.
在体外评估发光二极管（GC E Light）与卤素灯（Astralis 7）聚合对三种市售微混合复合树脂机械性能的影响。
评估了三种市售复合树脂（Tetric Ceram、Charisma和Z100）以及六种聚合模式（Astralis（AST）的一种模式：40秒高压灭菌，GC E Light（GCE）的五种模式：标准40秒、快速固化6秒、快速固化12秒、软固化A 39秒和涡轮模式10秒）的顶面和底面（2毫米深度）显微硬度及弯曲强度。针对每种测试的机械性能，制备了每种复合树脂的五个样本。使用维氏金刚石压头在每个样本的每一侧记录五个硬度值。以1毫米/分钟的十字头速度进行三点弯曲试验。使用双向方差分析（复合树脂、聚合模式）和费舍尔检验进行统计比较（P < 0.05）。
在两项测试中，Z100均表现出最高性能。顶面显微硬度：对于Tetric Ceram和Charisma，曝光时间越长，结果越高，AST模式与较长的GCE模式之间无差异。对于Z100，使用AST获得了最高值。无论何种材料，短时间（快速固化6秒和涡轮模式）的结果都很差。底面显微硬度：用AST固化的样本结果更高，但使用LED光固化机的快速固化12秒GCE模式可获得相当类似的机械性能。快速固化6秒和涡轮模式得到的结果最低。弯曲强度：结果与底面显微硬度的结果相当。
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