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首页> 外文期刊>Journal - Canadian Dental Association >Hardening of dual-cure resin cements and a resin composite restorative cured with QTH and LED curing units.
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Hardening of dual-cure resin cements and a resin composite restorative cured with QTH and LED curing units.

机译：使用QTH和LED固化单元对双固化树脂胶粘剂和树脂复合材料进行硬化固化。

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OBJECTIVE: The aim of this study was to determine the effects of light intensity and type of light unit (quartztungsten-halogen [QTH] or light-emitting diode [LED]) on the hardening of various resin cements and a resin composite restorative. METHODS: Disk specimens were prepared from 4 dual-cured resin cements (Variolink II, Calibra, Nexus 2 and RelyX ARC). Two QTH light-curing units (Visilux 2, at 550 mW/cm2, and Optilux 501, at 1,360 mW/cm2) and a LED unit (Elipar FreeLight, at 320 mW/cm2) were used for curing. Specimens were light-cured or dual-cured for 10, 30 or 40 seconds with 1 of the 3 light units (curing applied to upper surface only) and were tested 24 hours after curing. Additional cement specimens were self-cured and tested at 15, 30 and 60 minutes and at 24 hours. Testing consisted of measurement of Knoop hardness number (KHN) for each specimen. Six KHN values were obtained for the upper surface only of the various cement specimens in each test group. Disk specimens 2.5 mm thick were also prepared from a resin composite restorative (XRV Herculite). These were light-cured as above, and KHN measurements were obtained for both the upper and the lower surfaces. Mean KHNs were determined, and data were analyzed with analysis of variance. RESULTS: The groups were significantly different (p < 0.05). High-intensity light curing resulted in the highest KHN values for all materials with any of the 3 light-curing times. For the cements, LED light curing (with both dual-curing and light-curing modes) resulted in hardness values similar to those achieved with conventional QTH light curing, although there were some exceptions. However, both LED and conventional QTH light curing resulted in inferior hardening of lower surfaces of the XRV Herculite specimens at the 3 curing times. For all cements except Nexus 2, self-curing resulted in significantly lower hardness values than dual curing. The self-curing mechanism of Variolink II cement needed a longer time to activate than those of the other cements. CONCLUSIONS: High-intensity light curing and longer curing times resulted in the highest KHNs. The LED curing unit was associated with the lowest hardness values for lower surfaces of the resin composite restorative.
机译：目的：本研究的目的是确定光强度和光单元类型（石英钨-卤素[QTH]或发光二极管[LED]）对各种树脂胶粘剂和树脂复合修复剂硬化的影响。方法：圆盘标本由4种双固化树脂胶粘剂（Variolink II，Calibra，Nexus 2和RelyX ARC）制成。使用两个QTH光固化单元（550 mW / cm2的Visilux 2和1,360 mW / cm2的Optilux 501）和一个LED单元（Elipar FreeLight，320 mW / cm2）进行固化。用3个光单元中的1个对样品进行光固化或双重固化10、30或40秒（仅对上表面进行固化），并在固化后24小时进行测试。额外的水泥样品是自固化的，并在15、30和60分钟以及24小时进行了测试。测试包括测量每个样品的努氏硬度值（KHN）。每个测试组中仅对各种水泥样品的上表面获得了六个KHN值。还从树脂复合修复剂（XRV Herculite）制备了2.5毫米厚的圆盘样品。将它们如上所述进行光固化，并且获得上表面和下表面的KHN测量值。确定平均KHN，并通过方差分析对数据进行分析。结果：各组之间存在显着差异（p <0.05）。高强度光固化在所有3次光固化时间中的任何一个下均导致所有材料的KHN值最高。对于水泥，LED光固化（具有双固化和光固化两种模式）所产生的硬度值与常规QTH光固化所达到的硬度值相似，尽管有一些例外。但是，LED和常规QTH光固化都会导致XRV Herculite样品在3个固化时间下表面的硬化变差。对于除Nexus 2以外的所有水泥，自固化导致的硬度值明显低于双重固化。与其他水泥相比，Variolink II水泥的自固化机理需要更长的活化时间。结论：高强度光固化和更长的固化时间导致最高的KHNs。 LED固化单元与树脂复合修复剂下表面的最低硬度值相关。

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