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首页> 外文期刊>Operative dentistry >Curing capability of halogen and LED light curing units in deep class II cavities in extracted human molars.
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Curing capability of halogen and LED light curing units in deep class II cavities in extracted human molars.

机译：提取的人类臼齿中II类深腔中的卤素和LED光固化单元的固化能力。

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Class II cavities were prepared in extracted lower molars filled and cured in three 2-mm increments using a metal matrix. Three composites (Spectrum TPH A4, Ceram X mono M7 and Tetric Ceram A4) were cured with both the SmartLite PS LED LCU and the Spectrum 800 continuous cure halogen LCU using curing cycles of 10, 20 and 40 seconds. Each increment was cured before adding the next. After a seven-day incubation period, the composite specimens were removed from the teeth, embedded in self-curing resin and ground to half the orofacial width. Knoop microhardness was determined 100, 200, 500, 1000, 1500, 2500, 3500, 4500 and 5500 microm from the occlusal surface at a distance of 150 microm and 1000 microm from the metal matrix. The total degree of polymerization of a composite specimen for any given curing time and curing light was determined by calculating the area under the hardness curve. Hardness values 150 microm from the metal matrix never reached maximum values and were generally lower than those 1000microm from the matrix. The hardest composite was usually encountered between 200 microm and 1000 microm from the occlusal surface. For every composite-curing time combination, there was an increase in microhardness at the top of each increment (measurements at 500, 2500 and 4500 microm) and a decrease towards the bottom of each increment (measurements at 1500, 3500 and 5500 microm). Longer curing times were usually combined with harder composite samples. Spectrum TPH composite was the only composite showing a satisfactory degree of polymerization for all three curing times and both LCUs. Multiple linear regression showed that only the curing time (p < 0.001) and composite material (p < 0.001) had a significant association with the degree of polymerization. The degree of polymerization achieved by the LED LCU was not significantly different from that achieved by the halogen LCU (p = 0.54).
机译：用提取的下臼齿制备II类腔体，并使用金属基质以3个2mm的增量填充并固化。使用SmartLite PS LED LCU和Spectrum 800连续固化卤素LCU固化三种复合材料（Spectrum TPH A4，Ceram X mono M7和Tetric Ceram A4），固化周期为10、20和40秒。在添加下一个增量之前，将其固化。经过7天的潜伏期后，将复合材料样本从牙齿上取下，嵌入自固化树脂中，并研磨至口面宽度的一半。努氏显微硬度是在距金属表面150微米和1000微米的距离，从咬合面100、200、500、1000、1500、2500、3500、4500和5500微米处测定的。在任何给定的固化时间和固化光下，复合样品的总聚合度通过计算硬度曲线下的面积来确定。金属基质的150微米硬度值从未达到最大值，通常低于基质的1000微米。最坚硬的复合材料通常会在距咬合面200微米至1000微米之间遇到。对于每个复合固化时间组合，在每个增量的顶部（在500、2500和4500微米处进行测量）的显微硬度都增加，而在每个增量的底部（在1500、3500和5500微米处进行测量）的硬度降低。较长的固化时间通常与较硬的复合材料样品结合使用。 Spectrum TPH复合材料是唯一在所有三个固化时间和两个LCU中均显示令人满意的聚合度的复合材料。多元线性回归表明，只有固化时间（p <0.001）和复合材料（p <0.001）与聚合度显着相关。 LED LCU实现的聚合度与卤素LCU实现的聚合度没有显着差异（p = 0.54）。

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