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

Abstract

Abstract: 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 ZrO₂ increases to 5%, the bond strength begins to decrease. Scanning electron microscope analysis of the bonding section shows that with the increase of ZrO₂ 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.

Key words: zirconia, silica, self-etching adhesive, bonding strength, dentin tubule, marginal microleakage

CLC Number:

TQ437

TU Baoli, ZHANG Qinghong, WANG Haifeng, LIU Mei. Effect of Surface Modified Zirconia Inorganic Filler on Properties of Dental Self-Etching Adhesive[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(5): 1735-1742.

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