Liao Y, Liu X Q, Chen L, Zhou J F, Tan J G
Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China; Department of General Dentistry II, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China.
Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China.
Beijing Da Xue Xue Bao Yi Xue Ban. 2018 Feb 18;50(1):53-57.
To evaluate the effects of different surface treatments on the shear bond strength between zirconia and resin cement.
Forty zirconia discs were randomly divided into four groups (10 discs in each group) for different surface treatments: control, no surface treatment; sandblast, applied air abrasion with aluminum oxide particles; ultraviolet (UV), the zirconia sample was placed in the UV sterilizer at the bottom of the UV lamp at 10 mm, and irradiated for 48 h; cold plasma, the discs were put in the cold plasma cabinet with the cold plasma generated from the gas of He for 30 s. Specimens of all the groups were surface treated prior to cementation with Panavia F 2.0 cement. The surface morphology and contact angle of water were measured. The shear bond strengths were tested and the failure modes were examined with a stereomicroscope.
Surface morphology showed no difference between the UV/cold plasma group and the control group. Sandblasted zirconia displayed an overall heterogeneous distribution of micropores. The contact angle of the control group was 64.1°±2.0°. After sandblasting, UV irradiation and cold plasma exposure, the values significantly decreased to 48.8°±2.6°, 27.1°±3.6° and 32.0°±3.3°. The values of shear bond strength of the specimens with sandblasted (14.82±2.01) MPa were higher than those with no treatment (9.41±1.07) MPa with statistically significant difference (P<0.05). The values of shear bond strength of the specimens with UV irradiation (10.02±0.64) MPa were higher than those with no treatment (9.41±1.07) MPa, but without statistically significant difference (P>0.05). The values of cold plasma group (18.34±3.05) MPa were significantly higher than those of control group (9.41±1.07) MPa, even more than those with sandblast(14.82±2.01) MPa (P<0.05). X-ray photoelectron spectroscopy (XPS) showed increase in oxygen (O) and decrease in carbon (C) elements after UV and cold plasma treatment. The surface C/O ratio also decreased after UV and cold plasma treatment.
Zirconia specimens treated with UV and cold plasma could significantly improve the hydrophilicity. The surface morphology was unaffected by the UV irradiation and cold plasma treatments. The improvements of ziconia shear bond strength were slight in UV group without statistically significant difference. Cold plasma treatment significantly improved the shear bond strength between zirconia and resin cement.
评估不同表面处理对氧化锆与树脂水门汀之间剪切粘结强度的影响。
将40个氧化锆圆盘随机分为四组（每组10个圆盘）进行不同的表面处理：对照组，未进行表面处理；喷砂处理，用氧化铝颗粒进行空气研磨；紫外线（UV）处理，将氧化锆样品置于紫外线灯底部的紫外线消毒器中，距离为10 mm，照射48小时；冷等离子体处理，将圆盘放入冷等离子体箱中，用氦气产生冷等离子体处理30秒。所有组的标本在用Panavia F 2.0水门汀粘结之前均进行表面处理。测量表面形态和水接触角。测试剪切粘结强度，并用体视显微镜检查破坏模式。
表面形态显示紫外线/冷等离子体组与对照组之间无差异。喷砂处理的氧化锆显示出微孔的整体不均匀分布。对照组的接触角为64.1°±2.0°。经过喷砂、紫外线照射和冷等离子体处理后，该值显著降低至48.8°±2.6°、27.1°±3.6°和32.0°±3.3°。喷砂处理（14.82±2.01）MPa的标本的剪切粘结强度值高于未处理（9.41±1.07）MPa的标本，差异具有统计学意义（P<0.05）。紫外线照射（10.02±0.64）MPa的标本的剪切粘结强度值高于未处理（9.41±1.07）MPa的标本，但无统计学意义（P>0.05）。冷等离子体组（18.34±3.05）MPa的值显著高于对照组（9.41±1.07）MPa，甚至高于喷砂处理组（14.82±2.01）MPa（P<0.05）。X射线光电子能谱（XPS）显示，紫外线和冷等离子体处理后氧（O）元素增加，碳（C）元素减少。紫外线和冷等离子体处理后表面C/O比也降低。
紫外线和冷等离子体处理的氧化锆标本可显著提高亲水性。紫外线照射和冷等离子体处理未影响表面形态。紫外线组氧化锆剪切粘结强度的改善不明显，无统计学意义。冷等离子体处理显著提高了氧化锆与树脂水门汀之间的剪切粘结强度。
