Doctoral student, Graduate Implantology, Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University, São José dos Campos, Brazil.
Doctoral student, Department of Restorative Dentistry, Institute of Science and Technology, São Paulo State University, São José dos Campos, Brazil.
J Prosthet Dent. 2018 Dec;120(6):955-959. doi: 10.1016/j.prosdent.2018.01.029. Epub 2018 Jun 21.
Nonthermal plasma treatment could increase the bond strength of resin cements to zirconia, but studies are lacking.
The purpose of this in vitro study was to evaluate zirconia bond strength, surface roughness, and contact angle and to measure the infrared spectrum after different surface treatments.
Yttria-stabilized tetragonal zirconia polycrystal (Y-TZP; n=9) blocks were sectioned into 36 slices (12×11×3 mm) and divided (n=4) into surface treatment groups as follows: 2 control groups, consisting of airborne-particle abrasion plus primer (APP) and 10% hydrofluoric acid etching plus primer (HFP), and 3 experimental groups consisting of a nonthermal plasma (NP) application; a nonthermal plasma plus primer application (NPP); and a 10% hydrofluoric acid etching plus nonthermal plasma plus primer (HFNPP) application. Each zirconia disk was cemented to a prepolymerized resin block. After cementation, the specimens were sectioned for microtensile strength testing and for surface roughness analysis and contact angle analysis. Results were submitted to analysis of variance and Tukey tests (α=.05).
Results showed no statistically significant differences between the APP and HFNPP groups, but these 2 groups showed statistically better bonding than those of HFP, NP, and NPP.
Airborne-particle abrasion resulted in a significant increase in surface roughness compared with the other groups. After nonthermal plasma treatment, the contact angle of the zirconia surface decreased within 48 hours. Nonthermal plasma application for surface treatment of zirconia showed no significant difference in bond strength when compared with airborne-particle abrasion.
非热等离子体处理可以提高树脂水门汀与氧化锆的粘结强度，但目前研究较少。
本体外研究的目的是评估不同表面处理后氧化锆的粘结强度、表面粗糙度和接触角，并测量红外光谱。
将钇稳定四方氧化锆多晶（Y-TZP；n=9）块体切割成 36 个薄片（12×11×3mm），并（n=4）分为表面处理组，包括：2 个对照组，分别为喷砂加底漆（APP）和 10%氢氟酸蚀刻加底漆（HFP）；3 个实验组分别为非热等离子体（NP）处理、非热等离子体加底漆（NPP）处理和 10%氢氟酸蚀刻加非热等离子体加底漆（HFNPP）处理。每个氧化锆圆盘都粘结到预聚合树脂块上。粘结后，将试件进行微拉伸强度测试、表面粗糙度分析和接触角分析。结果进行方差分析和 Tukey 检验（α=.05）。
结果显示，APP 组和 HFNPP 组之间没有统计学上的显著差异，但这两组的粘结性能明显优于 HFP、NP 和 NPP 组。
与其他组相比，喷砂处理显著提高了表面粗糙度。非热等离子体处理后，氧化锆表面的接触角在 48 小时内降低。与喷砂处理相比，非热等离子体处理对氧化锆表面的粘结强度没有显著差异。
