Flury Simon, Lussi Adrian, Hickel Reinhard, Ilie Nicoleta
Department of Preventive, Restorative and Pediatric Dentistry, School of Dental Medicine, University of Bern, Freiburgstrasse 7, 3010, Bern, Switzerland,
Clin Oral Investig. 2014 Apr;18(3):809-18. doi: 10.1007/s00784-013-1051-y. Epub 2013 Aug 9.
The aim of this study was to investigate micromechanical properties of five dual-curing resin cements after different curing modes including light curing through glass ceramic materials.
Vickers hardness (VH) and indentation modulus (Y HU) of Panavia F2.0, RelyX Unicem 2 Automix, SpeedCEM, BisCem, and BeautiCem SA were measured after 1 week of storage (37 °C, 100 % humidity). The resin cements were tested following self-curing or light curing with the second-generation light-emitting diode (LED) curing unit Elipar FreeLight 2 in Standard Mode (1,545 mW/cm(2)) or with the third-generation LED curing unit VALO in High Power Mode (1,869 mW/cm(2)) or in XtraPower Mode (3,505 mW/cm(2)). Light curing was performed directly or through glass ceramic discs of 1.5 or 3 mm thickness of IPS Empress CAD or IPS e.max CAD. VH and Y HU were analysed with Kruskal-Wallis tests followed by pairwise Wilcoxon rank sum tests (α = 0.05).
RelyX Unicem 2 Automix resulted in the highest VH and Y HU followed by BeautiCem SA, BisCem, SpeedCEM, and finally Panavia F2.0. Self-curing of RelyX Unicem 2 Automix and SpeedCEM lowered VH and Y HU compared to light curing whereas self-curing of Panavia F2.0, BisCem, and BeautiCem SA led to similar or significantly higher VH and Y HU compared to light curing. Generally, direct light curing resulted in similar or lower VH and Y HU compared to light curing through 1.5-mm-thick ceramic discs. Light curing through 3-mm-thick discs of IPS e.max CAD generally reduced VH and Y HU for all resin cements except SpeedCEM, which was the least affected by light curing through ceramic discs.
The resin cements responded heterogeneously to changes in curing mode. The applied irradiances and light curing times adequately cured the resin cements even through 1.5-mm-thick ceramic discs.
When light curing resin cements through thick glass ceramic restorations, clinicians should consider to prolong the light curing times even with LED curing units providing high irradiances.
本研究旨在调查5种双重固化树脂水门汀在不同固化模式（包括通过玻璃陶瓷材料进行光固化）后的微观力学性能。
在储存1周后（37℃，100%湿度）测量Panavia F2.0、RelyX Unicem 2 Automix、SpeedCEM、BisCem和BeautiCem SA的维氏硬度（VH）和压痕模量（Y HU）。树脂水门汀在自固化或使用第二代发光二极管（LED）固化灯Elipar FreeLight 2以标准模式（1545 mW/cm²）或第三代LED固化灯VALO以高功率模式（1869 mW/cm²）或超功率模式（3505 mW/cm²）进行光固化后进行测试。光固化直接进行或通过IPS Empress CAD或IPS e.max CAD的1.5或3 mm厚的玻璃陶瓷盘进行。采用Kruskal-Wallis检验分析VH和Y HU，随后进行两两Wilcoxon秩和检验（α = 0.05）。
RelyX Unicem 2 Automix的VH和Y HU最高，其次是BeautiCem SA、BisCem、SpeedCEM，最后是Panavia F2.0。与光固化相比，RelyX Unicem 2 Automix和SpeedCEM的自固化降低了VH和Y HU，而Panavia F2.0、BisCem和BeautiCem SA的自固化导致VH和Y HU与光固化相似或显著更高。一般来说，与通过1.5 mm厚陶瓷盘进行光固化相比，直接光固化导致的VH和Y HU相似或更低。对于所有树脂水门汀，通过3 mm厚的IPS e.max CAD盘进行光固化通常会降低VH和Y HU，但SpeedCEM受陶瓷盘光固化的影响最小。
树脂水门汀对固化模式的变化反应不均一。即使通过1.5 mm厚的陶瓷盘，所施加的辐照度和光固化时间也能充分固化树脂水门汀。
当通过厚玻璃陶瓷修复体对树脂水门汀进行光固化时，即使使用提供高辐照度的LED固化灯，临床医生也应考虑延长光固化时间。
