Effects of microarc oxidation duty cycle and frequency on the bonding strength of titanium to porcelain / 实用口腔医学杂志

ABSTRACT

Objective:To study the effects of duty cycle and frequency of microarc oxidation(MAO) on the titanium ceramic bonding strength.Methods:Titanium samples were treated with MAO in a Na2SiO3 electrolytic solution with voltage 300 V?3 min. According to the different duty cycle and frequency,experimental groups were named as:group Ⅰ(0.2, 500 Hz); group Ⅱ(0.2, 1 000 Hz); group Ⅲ(0.04,1 000 Hz); group Ⅳ(0.04,500 Hz) and group Ⅴ(0.12,750 Hz). The non-MAO samples were used as a control group.The surface of the samples was observed by scanning electron microscope (SEM).The samples were bonded to porcelain,and the bonding strength was measured by a three point bending test according to ISO 9693.Results:The surfaces of 1 000 Hz test pieces were smaller holes,more holes in the number and thicker layer than that of 500 Hz. When measured the bonding strength(MPa) of the samples, group Ⅳ was higher than group Ⅲ(P