Doctoral student, Department of Operative Dentistry and Dental Materials, Dental School, Federal University of Uberlândia, Uberlândia, Minas Gerais, Brazil.
Professor, Department of Dental Clinical Sciences, Dalhousie University, Halifax, Nova Scotia, Canada.
J Prosthet Dent. 2024 Apr;131(4):744-751. doi: 10.1016/j.prosdent.2022.02.017. Epub 2022 Mar 31.
Some light-emitting diode polymerization lights have been promoted as multiple peak or polywave lights that use multiple light-emitting diodes to produce both violet and blue light. However, whether the addition of violet light is required to light-activate resin cements that use bis(4-methoxybenzoyl)diethylgermane (Ivocerin) as the photoinitiator is unclear.
This in vitro study evaluated the effect of violet, blue, or a combination of violet and blue light through ceramic on the degree of conversion of 2 resin cements that use either camphorquinone or Ivocerin as the photoinitiator.
A Bluephase Style polywave light-emitting diode polymerizing unit delivering 6.4 J/cm of violet and blue light was used. This comprised 1.4 J/cm of violet (385 to 420 nm) and 5.0 J/cm of blue light (420 to 515 nm). The light-emitting diode emitters in a second modified Bluephase Style were connected directly to a power supply so that either just violet (1.4 J/cm) or just blue (5.0 J/cm) light was emitted. RelyX Veneer and Variolink Esthetic LC resin cements were either directly light-activated or through 0.5 or 1.5 mm of lithium disilicate ceramic (IPS e.max CAD). The degree of conversion was monitored by using Fourier-transform infrared spectroscopy. Data were subject to a 3-way analysis of variance followed by the Tukey honest significant difference multiple comparison tests (α=.05).
All factors had a significant effect (P<.001). Increasing the ceramic thickness decreased the degree of conversion only for RelyX Veneer cement (P<.001). The effect of the thickness of ceramic was most noticeable when just violet light was delivered to RelyX Veneer. A significant reduction (P<.001) was found in the degree of conversion of RelyX Veneer when just violet light was delivered. Variolink Esthetic LC had significantly higher degree of conversion values than RelyX Veneer, irrespective of the light type used (P<.001).
A multiple-peak light is not required to photopolymerize a resin cement that uses either camphorquinone or Ivocerin as its photoinitiator. Adding the violet light produced no significant increase in the degree of conversion of the Variolink Esthetic LC cement.
一些发光二极管聚合灯被宣传为多峰或多波长灯，它们使用多个发光二极管同时产生紫光和蓝光。然而，使用双(4-甲氧基苯甲酰)二乙基锗（Ivocerin）作为光引发剂的树脂水门汀是否需要添加紫光才能被激活尚不清楚。
本体外研究通过陶瓷评估了紫光、蓝光或紫光和蓝光组合对使用樟脑醌或 Ivocerin 作为光引发剂的 2 种树脂水门汀的聚合程度的影响。
使用 Bluephase Style 多波长发光二极管聚合单元，提供 6.4 J/cm 的紫光和蓝光。这包括 1.4 J/cm 的紫光（385 至 420nm）和 5.0 J/cm 的蓝光（420 至 515nm）。第二个经过修改的 Bluephase Style 中的发光二极管发射器直接连接到电源，以便只发射紫光（1.4 J/cm）或只发射蓝光（5.0 J/cm）。RelyX Veneer 和 Variolink Esthetic LC 树脂水门汀要么直接光激活，要么通过 0.5 或 1.5mm 的二硅酸锂陶瓷（IPS e.max CAD）。通过傅里叶变换红外光谱监测聚合程度。数据采用 3 因素方差分析，然后进行 Tukey 诚实显著差异多重比较检验（α=.05）。
所有因素均有显著影响（P<.001）。增加陶瓷厚度仅降低了 RelyX Veneer 水门汀的聚合程度（P<.001）。当仅输送紫光时，陶瓷厚度的影响对 RelyX Veneer 最为明显。当仅输送紫光时，RelyX Veneer 的聚合程度显著降低（P<.001）。使用任何类型的光，Variolink Esthetic LC 的聚合程度都明显高于 RelyX Veneer（P<.001）。
对于使用樟脑醌或 Ivocerin 作为光引发剂的树脂水门汀，不需要多峰光来进行光聚合。添加紫光并没有显著提高 Variolink Esthetic LC 水门汀的聚合程度。
