目的:这项体外研究评估不同表面处理后氧化钇稳定四方氧化锆(Y-TZP)和树脂水泥的剪切粘结强度(SBS)。材料和方法:将48个陶瓷立方体分为四组(n=12):G1(对照)用Al2O3喷砂;用二氧化硅涂层的Al2O3(Rocatec)进行G2喷砂;G3-RocatecCO2激光;和G4-CO2激光Rocatec。将金属底漆施加到预处理的陶瓷上。在中心区域改装了一个橡胶圈,然后,将树脂水泥插入基质中并进行光活化。评估样品的表面粗糙度(Ra),SBS,故障类型,并用扫描电子显微镜(SEM)进行定性。数据采用单因素方差分析和Tukey检验(p<0.05)。结果:Ra(μm)的平均值如下:G1-4.52a,G2-4.24a,B,G3-4.10a,B,和G4-2.90b和SBS(MPa)的平均值如下:G1-7.84a,G2-4.41b,G3-4.61b和G4-6.14a,Procedures.SEM分析显示所有组的表面不规则性,对于G1更为突出。在G2、G3和G4中观察到二氧化硅沉积物的存在,但在最后两组中存在一些线性区域,通过二氧化硅的融合促进,由于CO2激光的热机械作用。结论:CO2激光+Rocatec表面处理,使用一种MDP基水泥,可以是Y-TZP陶瓷的粘附胶结的替代方案,因为它与氧化铝喷砂的常规预处理一样有效。
Objective: This in vitro study evaluates the shear bond strength (SBS) of yttria-stabilized tetragonal zirconia (Y-TZP) and resin cement after different surface treatments. Materials and methods: Forty-eight ceramic cubes were divided into four groups (n = 12): G1 (control) sandblasting with Al2O3; G2-sandblasting with silica-coated Al2O3 (Rocatec); G3-Rocatec + CO2 laser; and G4-CO2 laser + Rocatec. A metallic primer was applied to the pretreated ceramic. A rubber ring was adapted on the central area, and then, the resin cement was inserted into the matrix and photoactivated. The samples were evaluated regarding surface roughness (Ra), SBS, failure type, and qualitatively with scanning electron microscopy (SEM). The data were analyzed by one-way analysis of variance followed by Tukey\'s test (p < 0.05). Results: The mean values of Ra (μm) were as follows: G1-4.52a, G2-4.24a,b, G3-4.10a,b, and G4-2.90b and the mean values of SBS (MPa) were as follows: G1-7.84a , G2-4.41b , G3-4.61b and G4-6.14a,b. SEM analyses showed superficial irregularities for all groups, being more prominent for G1. The presence of silica deposits was observed for G2, G3, and G4, but in the last two groups there were some linear areas, promoted by the fusion of silica, due to the thermomechanical action of the CO2 laser. Conclusions: The surface treatment with CO2 laser + Rocatec, using one MDP-based cement, can be an alternative protocol for the adhesion cementation of Y-TZP ceramic since it was as effective as the conventional pretreatment with aluminum oxide sandblasting.