微弧氧化中MgSiF6与Na2SiO3混合溶液对钛瓷结合强度的影响

Effects of MgSiF_6 and Na_2SiO_3 mixed electrolyte for micro-arc oxidation on the bonding strength between titanium and porcelain

目的研究Na_2SiO_3和MgSiF_6不同比例的复合溶液微弧氧化处理对钛瓷结合强度的影响。方法喷砂后的纯钛试件随机分成四组,A、B、C三组进行微弧氧化,其电解液分别为的20 g/L MgSiF_6(A组)、20 g/L MgSiF_6+1 g/L Na_2SiO_3(B组)、20 g/L MgSiF_6+2 g/L Na_2SiO_3(C组),对照组(D组)仅喷砂处理,对钛试件微弧氧化后形成的膜层进行扫描电镜(SEM)观察,试件进行烤瓷后通过三点弯曲试验测定钛瓷结合强度。结果通过三点弯曲试验测得A、B、C、D四组钛瓷结合强度分别为:(39.13±2.49)MPa、(37.56±2.83)MPa、(43.55±2.11)MPa和(30.13±1.65)MPa,微弧氧化组的钛瓷结合强度均高于喷砂对照组(P<0.05),且高于ISO 9693规定的临床标准,其中20 g/L MgSiF_6+2 g/L Na_2SiO_3复合溶液组(C组)的钛瓷结合强度高于其他各组(P<0.05)。扫面电镜结果显示微弧氧化组均能形成均匀多孔的陶瓷膜层,但其微孔数目和孔径略有差别,C组形成的膜层微孔数目较多,孔径约1μm,瓷剥脱后表面瓷粉残留高于其他组。结论使用合适比例的复合电解液进行微弧氧化处理可以提高钛瓷结合强度。

Objective To investigate the effects of the composite electrolyte for micro-arc oxidation （MAO） on the bonding strength between titanium and porcelain. Methods The composite electrolyte of Na2SiO3 and MgSiF6 was chosen as MAO reaction solutions. There were four groups： 20g/L MgSiF6 （group A）、20g/L MgSiF6＋1g/L Na2SiO3 （group B）、20g/L MgSiF6＋2g/L Na2SiO3 （group C） and the sandblasting treatment was selected as a control group （group D）. After different treatments disposed and porcelain fused on each sample, bonding strengths of the titanium-porcelain were measured by the three-point bending test accordi ng to ISO 9693. The morphology of the micro-arc oxidation coating on titanium substrate were detected by scanning electron microscopy （SEM）. Results The mean bond strength of the three micro-arc oxidation groups, and the control group were （39.13±2.49）MPa、（37.56±2.83） MPa、（43.55±2.11）MPa and （30.13±1.65）MPa respectively. The bond strengths of micro-arc oxidation groups were significantly higher than the control groups （P〈0.05）. When the titanium were treated by micro-arc oxidation with 20g/L MgSiF6 and 2g/L Na2SiO3, it had higher bonding strength than that in any other groups （P〈0.05）. The surface of the sample in micro-arc oxidation groups were porous and homogeneous while the sample in the control group was sharp and rough. The number of micropores in group B and group C was more than that in group A. But the diameter of micropores in group B （〈0.5μm） was smaller than that in group A and group C （1μm）. After three-point bending test, the residual porcelains of group C were more than that of other groups. Conclusions The micro-arc oxidation treatment by suitable proportion of composite electrolyte could be an effective method for increasing the titanium -porcelain bonding strength.