Karanasiou Christina, Dionysopoulos Dimitrios, Mourouzis Petros, Strakas Dimitrios, Naka Olga, Tolidis Kosmas
Department of Operative Dentistry, Faculty of Dentistry, School of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece.
Department of Prosthodontics, Faculty of Dentistry, School of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece.
Eur J Oral Sci. 2024 Oct;132(5):e13013. doi: 10.1111/eos.13013. Epub 2024 Aug 15.
This study evaluated the changes in surface properties of three resin-based restorative materials after two laser-assisted, in-office tooth bleaching protocols using erbium, chromium: yttrium-scandium-gallium-garnet (Er,Cr:YSGG) or diode (980 nm) lasers. A nanohybrid composite (Enamel Plus HRi), a Bis-GMA-free composite (Enamel Plus HRi Bio Function), and a resin-matrix CAD-CAM ceramic (Shofu Block HC) were tested. Forty specimens for each material were prepared and divided into four groups (n = 10/group). The control specimens did not undergo any bleaching treatment, whereas group 2 received bleaching with 40% hydrogen peroxide (HO), while groups 3 and 4 underwent the same bleaching procedure with the use of diode (980 nm) or Er,Cr:YSGG lasers, respectively. Surface microhardness and roughness measurements were conducted using a Vickers tester and an optical profilometer. Microhardness was lower in bleached specimens, with the nanohybrid composite exhibiting the largest difference from the no bleaching group. For the Bis-GMA-free composite the microhardness difference between no bleaching and laser-assisted bleaching were smaller than seen for the conventional bleaching technique. Surface roughness was higher in bleached specimens, with nanohybrid composite showing the largest differences from the control specimens. The examined laser-assisted tooth bleaching protocols were found not to impact surface microhardness and roughness of the tested resin-based specimens and they are deemed suitable for clinical use.
钇钪镓石榴石（Er,Cr:YSGG）或二极管（980nm）激光进行两种激光辅助的诊室牙齿漂白方案后的表面性能变化。测试了一种纳米混合复合材料（Enamel Plus HRi）、一种不含双酚A甲基丙烯酸缩水甘油酯（Bis-GMA）的复合材料（Enamel Plus HRi生物功能材料）和一种树脂基质的计算机辅助设计与制造（CAD-CAM）陶瓷（松风Block HC）。每种材料制备40个样本，并分为四组（每组n = 10）。对照组样本未接受任何漂白处理，而第2组用40%过氧化氢（HO）进行漂白，第3组和第4组分别使用二极管（980nm）或Er,Cr:YSGG激光进行相同的漂白程序。使用维氏硬度计和光学轮廓仪进行表面显微硬度和粗糙度测量。漂白后的样本显微硬度较低，纳米混合复合材料与未漂白组的差异最大。对于不含Bis-GMA的复合材料，未漂白组与激光辅助漂白组之间的显微硬度差异小于传统漂白技术。漂白后的样本表面粗糙度较高，纳米混合复合材料与对照样本的差异最大。研究发现，所检查的激光辅助牙齿漂白方案不会影响测试的树脂基样本的表面显微硬度和粗糙度，并且它们被认为适用于临床使用。
