不同瓷表面处理对长石质可切削陶瓷黏结强度的影响

背景:长石质可切削陶瓷作为全瓷材料中不可分割的一种,应用于牙科椅旁CAD/CAM系统,具有精确、快速、高效并且一次就诊等优点,其黏结效果与各种瓷表面处理方法息息相关。目的:比较不同瓷表面处理对长石质可切削陶瓷的黏结强度的影响。方法:将切割好的32个VitaMarkⅡ瓷片分为4组:空白组瓷表面无处理;酸蚀组PorcelainEtchant酸蚀40s,流水冲洗1min后吹干;硅烷偶联剂组使用RelyXCeramicPrimer处理,1min后吹干;酸蚀和硅烷偶联剂联合组按上述方法酸蚀后涂布硅烷偶联剂,1min后吹干。每组依次与RelyXUnicem进行黏结。万能材料试验机测其剪切强度,扫描电镜观察黏结界面。结果与结论:酸蚀和硅烷偶联剂联合组的黏结强度最高,显著高于其余3组(P<0.05),硅烷偶联剂组黏结强度显著高于酸蚀组与空白组(P<0.05)。酸蚀和硅烷偶联剂联合组黏结界面最紧密。说明酸蚀和硅烷偶联剂联合应用可提高长石质可切削陶瓷的黏结强度。

Influence of different surface treatments on shear bond strength to feldspathic machinable ceramics

BACKGROUND:Feldspathic machinable ceramics are an essential all-ceramic material,it has been used in CAD/CAM chairside dental restoration system and has advantages with precision,rapid,efficiency and single visit.The bonding result is relevant to different surface treatments.OBJECTIVE:To evaluate the shear bond strength of different surface treatments to feldspathic machinable ceramics.METHODS:Thirty-two Vita MarkⅡ ceramic slices were randomly divided into four groups.Blank group:no treating;acid etching group:acid etching for 40 seconds using Porcelain Etchant and water washing for one minute;silane coupling agent group:treating with RelyX Ceramic Primer for one minute and drying;combination group:laying on silane coupling agent for one minute after acid etching and drying.All ceramic slices were cemented with RelyX Unicem.Shear bond strength was determined on an universal testing machine.The bonded surface was examined with scanning electron microscopy.RESULTS AND CONCLUSION:The bond strength in combination group was significantly higher than the other three groups(P < 0.05),and the silane coupling agent group was superior to acid etching group and blank group(P < 0.05).The bonded surface of combination group was the most compact.Acid etching combined to silane coupling agent can significantly increase shear bond strength to feldspathic machinable ceramics.