Effects of different concentrations of MgSiF6 as electrolyte for micro-arc oxidation on the bond strength between titanium and porcelain / 中华口腔医学杂志

ABSTRACT

Objective@#To investigate the effects of different concentrations of MgSiF6 as electrolyte on the bond strength between titanium and porcelain after micro-arc oxidation (MAO) treatment and screen the suitable concentration of MgSiF6 that can improve the bond strength between titanium and porcelain.@*Methods@#Four different concentrations of MgSiF6 (10, 20, 30, 40 g/L) were chosen as MAO reaction solutions. Sandblasting treatment was selected as a control group. After porcelain was fused to each specimen, titanium-porcelain bond strengths were evaluated by the three-point bending test according to ISO 9693. Scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) were adopted to evaluate the morphologies and elemental compositions of both the MAO coatings and the interfaces of the titanium-porcelain restoration.@*Results@#The surface of titanium specimen in the control group was sharp and rough, while specimens in both 10 g/L group and 20 g/L group were porous and homogeneous. However, the pores found on the specimens in the latter group were larger in diameter (approximately 1.0-2.0 μm) than those on the former one (0.2-0.5 μm). The bond strengths of the control group and the experimental groups (10, 20, 30, 40 g/L MgSiF6) were (27.08±3.16), (38.18±2.65), (44.75±2.21), (36.44±2.04), (31.04±2.59) MPa, respectively. All the experimental groups showed higher bond strengths than the control group did (P<0.05), and the bond strength of 20 g/L MgSiF6 group was significantly higher than those of the other groups (P<0.05). Besides, the interfaces between titanium and porcelain were tight and compact in the 20 g/L group, while different amounts of pores and cracks were visible in the other groups. Additionally, after the three-point bending test, few residual porcelains could be observed on the surfaces of specimens in the control group.@*Conclusions@#MAO treatment with 20 g/L MgSiF6 on titanium can improve bonding strength between titanium and porcelain.