两种喷砂粒度对钯银合金金瓷结合强度的影响

doi:10.3877/cma.j.issn.1674-1366.2015.01.006

中华口腔医学研究杂志(电子版) ›› 2015, Vol. 09 ›› Issue (01) : 37 -43. doi: 10.3877/cma.j.issn.1674-1366.2015.01.006

所属专题：文献；

基础研究

两种喷砂粒度对钯银合金金瓷结合强度的影响

叶剑涛¹^,^†(

), 李博华², 李洁银¹, 王希乾², 王璐², 叶秀华¹

^1. 510120　广州，中山大学孙逸仙纪念医院口腔科
^2. 450000　郑州，河南省人民医院口腔科

收稿日期:2014-11-01 出版日期:2015-02-01
通信作者: 叶剑涛

Effects of two sizes of sandblasting on the metal-ceramic bonding strength of palladium-silver alloy

Jiantao Ye¹^,^†(), Bohua Li², Jieyin Li¹, Xiqian Wang², Lu Wang², Xiuhua Ye¹

^1. Department of Stomatology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou 510120, China
^2. Department of Stomatology, Henan Provincial People′s Hospital, Zhengzhou 450000, China

Received:2014-11-01 Published:2015-02-01
Corresponding author: Jiantao Ye
About author:
Corresponding author: Ye Jiantao, Email: dutaoye@163.com, Tel: 020-81332579

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目的

研究上瓷前不同粒度喷砂对钯银合金金瓷结合强度的影响。

方法

采用不同粒度（250、120 μm）的Al₂O₃在0.3 MPa压力下，以45°角对钯银合金试件表面进行喷砂10 s粗化处理后，对合金表面的粗糙度、表面接触角进行检测。用ISO 9693规定的三点弯曲测试分别测定其金瓷试件的结合强度。两组表面粗糙度、表面接触角以及金瓷结合强度的数据使用独立样本t检验进行统计学分析（α= 0.05）。使用有X线能谱分析的扫描电镜观察试件的显微特征，元素成分。

结果

250 μm喷砂处理后钯银合金金属表面粗糙度2.03 μm，接触角46.02°，与120 μm喷砂处理后的表面粗糙度1.69 μm、接触角63.61°比较，表面更为粗糙，润湿性更好。250 μm组的金瓷结合强度为（51.61 ± 5.91）MPa，120 μm组的金瓷结合强度为（46.62 ± 4.33）MPa，两者间差异有统计学意义（t=2.360，P=0.028）。三点弯曲测试后，所有开裂试件都为混合折裂模式。

结论

钯银合金在0.3 MPa压力下，250 μm较120 μm Al₂O₃喷砂后能获得较高的金瓷结合强度。

关键词: 喷砂粒度, 粗糙度, 表面接触角, 金瓷结合强度

Objective

To investigate the effect of size of sandblasting on metal-ceramic bonding strength of Pd-Ag alloy.

Methods

The surface roughness (Ra) and contact angle of Pd-Ag alloy surface were evaluated after using the different sizes of Al₂O₃ (250, 120 μm) in 0.3 MPa air pressure to rough the alloy surface. The bond strengths were evaluated using a three-point bend test according to ISO 9693. The data of surface roughness, surface contact angle, and metal-ceramic bonding strength between two groups were analyzed using independent sample t-test (α= 0.05) . Scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS) was used to evaluate microscopic features and elemental compositions.

Results

The mean surface roughness was 2.03 μm and the contact angle was 46.02° for sandblasted with 250 μm Al₂O₃ particles. Sandblasted with 250 μm Al₂O₃ provided rougher surface and better surface wettability than sandblasted with 120 μm Al₂O₃. The mean bonding strength of 250 μm sandblasting and 120 μm sandblasting group were (51.61 ± 5.91) and (46.62 ± 4.33) MPa, respectively. There was a statistically significant difference between two groups (t=2.360, P=0.028) . Mixture of adhesive and cohesive fracture modes were observed from fracture surfaces of all specimens.

Conclusion

Sandblasted with 250 μm Al₂O₃ obtain higher bond strengths than 120 μm in 0.3 MPa air pressure.

Key words: Sandblasting size, Surface roughness, Contact angle, Metal-ceramic bonding strength

图1 钯银合金试件表面镜下观（SEM × 1000）

表1 不同粒度喷砂金属表面粗糙度和接触角（ ± s）

组别	试件数	Ra（μm）	接触角（θ°）
250 μm喷砂组	5	2.03 ± 0.23	46.02 ± 2.06
120 μm喷砂组	5	1.69 ± 0.30	63.61 ± 1.95

表1 不同粒度喷砂金属表面粗糙度和接触角（ ± s）

组别	试件数	Ra（μm）	接触角（θ°）
250 μm喷砂组	5	2.03 ± 0.23	46.02 ± 2.06
120 μm喷砂组	5	1.69 ± 0.30	63.61 ± 1.95

图2 金瓷试件结合界面镜下观（SEM × 500）

表2 两组试件的金瓷结合强度（ ± s）

组别	试件数	结合强度（MPa）
250 μm喷砂组	12	51.61 ± 5.91
120 μm喷砂组	12	46.62 ± 4.33

表2 两组试件的金瓷结合强度（ ± s）

组别	试件数	结合强度（MPa）
250 μm喷砂组	12	51.61 ± 5.91
120 μm喷砂组	12	46.62 ± 4.33

图3 金瓷试件剥离面肉眼观

图4 金瓷剥离面金属暴露部分镜下观（SEM × 1000）

图5 折裂金属表面电镜二次成像

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