硅烷偶联剂对纯钛表面改性及细胞相容性的影响

Silane coupler effects on titanium surface modification and biocompatibility

背景:目前国内将硅烷偶联用于金属表面预处理的报道较少。目的:对NaOH碱处理的钛片行硅烷化改性,观察硅烷膜的表面形貌与结构特征及细胞相容性。方法:对制得的纯钛试件行NaOH碱处理,然后分别以8%,15%,33%浓度的KH-550硅烷偶联剂进行改性处理,以纯钛片和碱处理的钛片为对照组,采用扫描电镜观察改性处理钛片表面微观形貌,采用能谱仪分析改性处理钛片表面的成分。将纯钛片、碱处理的钛片及不同浓度KH-550硅烷偶联剂改性处理的钛片分别与犬骨髓间充质干细胞共培养,观察材料表面细胞的形态及黏附。结果与结论:硅烷膜由许多呈脑浆状的小片构成,排列紧密,主要由C、N、O、Si等元素组成。当硅烷溶液浓度为8%时,钛表面难以形成较完整的硅烷膜;当硅烷溶液浓度为15%时,钛表面形成的硅烷膜表面较8%浓度组钛表面相对较完整,但可仍见有较多裂纹,难以形成致密的硅烷膜;当硅烷溶液浓度为33%时,纯钛表面能形成致密的硅烷膜。犬骨髓间充质干细胞在33%浓度硅烷膜处理后钛基体上的黏附情况明显优于纯钛、碱处理钛片及8%,15%浓度硅烷膜处理后的钛片。说明33%硅烷化改性纯钛表面硅烷膜较完整,并且具有良好的生物相容性,可促进骨髓间质干细胞在活性层表面的黏附。

BACKGROUND：Nowadays, silane coupling for metal surface pretreatment has not been widely applied yet. OBJECTIVE：To observe the surface appearance, structure and biocompatibility of NaOH pre-treated titanium sheet coated with silane films. METHODS：The NaOH pre-treated titanium sheet was silanized with the silane coupler （KH-550） at different concentrations （8%, 15%and 33%）. The test specimens manufactured with different concentrations of silane treatment solutions were analyzed with scanning electron microscope and energy dispersive spectroscopy analyzer, in comparison with pure titanium and alkali-pretreated titanium sheets as controls. After silanization, bone marrow mesenchymal stem cel s from dogs were co-cultured with the test specimens to observe the cel morphology and adhesion on the surface of test specimens. RESULTS AND CONCLUSION：The silane film consisted of brain shaped sheets which arranged closely. The composition of the silane film was C, N, O and Si. The test specimen coated with the 33%silane solution had the ful silane film, while the silane film was imperfect at a concentration of 8%. The cel adhesion was better on the surface of test specimens treated with 33%silane solution than the other specimens. These findings indicate that the titanium sheet modified with 33%silane solution possesses a good biocompatibility, thereby improving the cel adhesion, spreading, proliferation and differentiation.