Gonulol Nihan, Ozer Sezin, Tunc Emine Sen
Department of Restorative Dentistry, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey.
Department of Pediatric Dentistry, Faculty of Dentistry, Ondokuz Mayıs University, Samsun, Turkey.
Int J Paediatr Dent. 2016 Sep;26(5):376-82. doi: 10.1111/ipd.12213. Epub 2015 Nov 9.
To assess the effects of different modes of a third-generation light-curing unit (LCU) (VALO) on the microhardness of restorative materials.
A microhybrid composite resin (Filtek(™) Z550), a giomer (Beautifil II), a compomer (Dyract eXtra) and a RMGIC (Photac(™) Fil) were used in the study. Three different modes of VALO were tested and a second-generation LCU (Elipar S10) was used as a control. The microhardness (VHN) was measured using a Vickers Hardness tester. Data were analyzed using two-way anova and post hoc Tukey's test (P < 0.05).
The Filtek Z550 group had the highest VHN values followed by Photac Fil, Beautifil II and the Dyract eXtra at both top and bottom surfaces, however the difference between Filtek Z550 and Photac Fil was not statistically significant for the bottom surfaces (P > 0.05). Of the different curing protocols tested, the VALO LCU in Mode 3 resulted in the lowest VHN values at both top and bottom surfaces (P < 0.05).
Based on the results of this study, it can be concluded that the high-power mode of the VALO LCU can be recommended for clinical applications especially in pediatric patients, as it can shorten the time required to adequately polymerize resin-based tooth-colored restorative materials.
评估第三代光固化机（VALO）的不同模式对修复材料微硬度的影响。
本研究使用了一种微混合复合树脂（Filtek(™) Z550）、一种聚酸改性复合树脂（Beautifil II）、一种复合体（Dyract eXtra）和一种树脂改性玻璃离子水门汀（Photac(™) Fil）。测试了VALO的三种不同模式，并使用第二代光固化机（Elipar S10）作为对照。使用维氏硬度计测量微硬度（VHN）。数据采用双向方差分析和事后Tukey检验进行分析（P < 0.05）。
在顶面和底面，Filtek Z550组的VHN值最高，其次是Photac Fil、Beautifil II和Dyract eXtra，然而在底面，Filtek Z550和Photac Fil之间的差异无统计学意义（P > 0.05）。在所测试的不同固化方案中，模式3的VALO光固化机在顶面和底面均导致最低的VHN值（P < 0.05）。
基于本研究结果，可以得出结论，VALO光固化机的高功率模式可推荐用于临床应用，特别是在儿科患者中，因为它可以缩短充分聚合树脂基牙齿颜色修复材料所需的时间。
