Department of Prosthodontics, Istanbul Okan University Faculty of Dentistry, Istanbul, Turkey and ITI Scholar, Division of Postdoctoral and Research, National Autonomous University of Mexico, Mexico City, Mexico.
Department of Prosthodontics, Kütahya Health Sciences University Faculty of Dentistry, Kütahya, Turkey.
J Mech Behav Biomed Mater. 2021 May;117:104401. doi: 10.1016/j.jmbbm.2021.104401. Epub 2021 Feb 18.
To evaluate the effect of thermocycling on the water contact angle (WCA), surface roughness (SR), and microhardness (MH) of resin-matrix computer-assisted design and computer-assisted manufacturing (CAD-CAM) ceramics after different surface treatments (conventional polishing or 2 different surface sealants).
Two different types of resin-matrix CAD-CAM ceramics; a nanoparticle-filled resin (CeraSmart; CS) and a resin nanoceramic (Lava Ultimate; LU) were tested. Rectangular-shaped plates (1 mm-thick) were divided into 3 groups (n = 8) in terms of surface treatment methods applied: conventional polishing (control) or 2 surface sealants (Optiglaze (OG) and Palaseal (PS)). Scanning electron microscope images ( × 1000 and × 700 magnifications) of each material were taken from 2 additional specimens before surface treatments. After surface treatments, WCAs of deionized water, SR, and MH values of specimens were measured. All specimens were subjected to 5000 thermocycling and measurements were repeated. SR, WCA, and MH data before and after thermocycling were compared by using a 2-way ANOVA (α=.05).
A significant interaction was found between the surface treatment and the material for WCA after thermocycling (P < .001), for SR before thermocycling (P = .014), and for MH both before and after thermocycling (P < .001). SEM images before surface treatments revealed that the surface of CS was mechanically rougher with a more microretentive topography compared with the surface of LU. No significant correlation was found between SR and WCA (P > 0.05).
Thermocycling affected the SR, MH, and WCA of all resin-matrix CAD-CAM ceramics.
评估不同表面处理（常规抛光或 2 种不同的表面密封剂）后，树脂基质计算机辅助设计和计算机辅助制造（CAD-CAM）陶瓷的水接触角（WCA）、表面粗糙度（SR）和显微硬度（MH）的热循环影响。
测试了两种不同类型的树脂基质 CAD-CAM 陶瓷；一种纳米颗粒填充树脂（CeraSmart；CS）和一种树脂纳米陶瓷（Lava Ultimate；LU）。根据所应用的表面处理方法，将矩形片（1 毫米厚）分为 3 组（n = 8）：常规抛光（对照）或 2 种表面密封剂（Optiglaze（OG）和 Palaseal（PS））。在进行表面处理之前，从另外 2 个标本中获取每种材料的扫描电子显微镜图像（×1000 和×700 放大倍数）。对处理后的试件的去离子水 WCA、SR 和 MH 值进行测量。所有标本均进行 5000 次热循环，重复测量。使用双向方差分析（α=.05）比较热循环前后的 SR、WCA 和 MH 数据。
热循环后 WCA（P<.001）、热循环前 SR（P=.014）和热循环前后 MH（P<.001）均发现表面处理与材料之间存在显著交互作用。在进行表面处理之前，SEM 图像显示 CS 的表面粗糙度更大，具有更微观的保留形貌，与 LU 的表面相比。在 SR 和 WCA 之间未发现显著相关性（P>.05）。
热循环影响了所有树脂基质 CAD-CAM 陶瓷的 SR、MH 和 WCA。
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