Insufficient cure under the condition of high irradiance and short irradiation time
Insufficient cure under the condition of high irradiance and short irradiation time
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DOI：
10.1016/j.dental.2008.07.007
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发表时间：
2009-03-01
期刊：
影响因子：
5
通讯作者：
Suh, Byoung I.
中科院分区：
文献类型：
--
作者：
Feng, Li;Carvalho, Ricardo;Suh, Byoung I.
目标。研究等离子弧固化 (PAC) 光是否以及为何会导致甲基丙烯酸酯基树脂或树脂复合材料固化不足。方法。模型二甲基丙烯酸酯树脂、商用牙科粘合剂和商用树脂复合材料使用 PAC 灯和卤素灯进行固化，辐射曝光相似，但辐照度和照射时间的组合不同。双键转化率 (DC) 使用 FTIR 光谱进行测量，并作为辐射暴露的函数进行分析。结果。对于粘度最低的模型树脂以及四种粘合剂中的三种，PAC 灯产生的直流电压低于卤素灯。凭借高辐照度，PAC 光可以像卤素灯一样彻底固化四种复合材料中的三种。然而，当辐照度降低时，三种复合材料产生较低的 DC。结论。当照射时间太短时，PAC 灯或任何具有非常高辐照度的固化灯可能会导致固化不足。这是因为在较高的辐照度下，自由基的寿命较短。 (C) 2008 年牙科材料学会。由爱思唯尔有限公司出版。保留所有权利。
Objectives. To investigate if and why a plasma arc curing (PAC) light tends to undercure methacrylate-based resins or resin composites.Methods. Model dimethacrylate resins, commercial dental adhesives, and commercial resin composites were cured using a PAC light and a halogen light with the similar radiant exposures but different combinations of irradiance and irradiation time. The degree of double bond conversion (DC) was measured with FTIR spectroscopy and analyzed as a function of radiant exposure.Results. The PAC light produced a lower DC than the halogen light for the model resin with the lowest viscosity and for three of the four adhesives. With a high irradiance, the PAC light could cure three of the four composites as thoroughly as its halogen counterpart. When the irradiance was reduced, however, three composites yielded a lower DC.Conclusions. insufficient cure by PAC lights or any curing lights with very high irradiance is likely to happen when too short an irradiation time is used. It is because under higher irradiance, the lifetime of free radicals is shorter. (C) 2008 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.