表面改性氧化锆无机填料对齿科自酸蚀粘结剂性能的影响

Effect of Surface Modified Zirconia Inorganic Filler on Properties of Dental Self-Etching Adhesive

用溶胶-凝胶法对氧化锆粉体表面包覆氧化硅,并用硅烷偶联剂γ-甲基丙烯酰氧丙基三甲氧基硅烷(γ-MPS)进行表面修饰,制备了齿科粘结剂用无机填料。以双酚A-甲基丙烯酸缩水甘油酯(Bis-GMA)单体、二甲基丙烯酸三乙二醇酯(TEGDMA)稀释剂、甲基丙烯酸-2-羟乙酯(HEMA)两性单体、10-(2-甲基丙烯酰氧基)磷酸单癸酯(10-MDP)酸蚀剂为主要成分,将改性过的氧化锆按照质量分数为1%~10%的比例进行填充,测试了自酸蚀粘结剂的粘结强度等性能。结果表明,当填料质量分数为2%时明显提高粘结剂的粘结性能,其粘结强度为(31.63±1.53)MPa;而当ZrO_(2)填充的质量分数增加到5%后,粘结强度开始下降。扫描电镜对粘结断面进行分析,发现随着ZrO_(2)填充量的提高,自酸蚀粘结剂对牙本质小管和复合树脂的渗入作用减弱,导致粘结性能下降。超景深显微镜对样本切片观察显示,粘结剂的存在可以明显缩小牙齿与复合树脂之间的缝隙。

By silica coating the surface of zirconia powder with sol-gel method and subsequently modifying the surface with silane coupling agent γ-methacryloxypropyltrimethoxysilane(γ-MPS),an inorganic filler for dental adhesive was prepared.Using bisphenol A-glycidyl methacrylate(Bis-GMA)monomer,triethylene glycol dimethacrylate(TEGDMA)diluent,2-hydroxyethyl methacrylate(HEMA)amphoteric monomer,and 10-(2-methacryloyloxy)monodecyl phosphate(10-MDP)etching agent as main components,and the modified zirconium oxide is filled with a mass fraction of 1% to 10%,the bonding strength and other properties of self-etching adhesive were tested.The results show that the mechanical properties of the adhesive are significantly improved when the filler mass fraction is 2%,and the bonding strength is(31.63±1.53)MPa.However,when the mass fraction of ZrO_(2) increases to 5%,the bond strength begins to decrease.Scanning electron microscope analysis of the bonding section shows that with the increase of ZrO_(2) filling amount,the infiltration effect of self-etching adhesive on dentin tubules and composite resin is somewhat weakened,resulting in the decrease of bonding performance.The sample sections under the ultra-depth-of-field microscope shows that the presence of adhesive significantly reduces the gap between teeth and composite resin.