Abstract:

Objective To investigate the effect of a new engineering technique of vacuum deposition - plasma magnetron reactive sputter deposition technique on the metal- porcelain bond strength of a new type of Co- Cr ceramic and framework dental alloy. Methods Before porcelain painted on the specimens, the standardized metal strips made from DA9- 4 dental alloy were coated with a thin Al2O3 ceramic film by plasma magnetron reactive sputter deposition technique. The conformation, structure and thickness of the ceramic film were analyzed. The specimens for three- point bending test made from DA9- 4 alloy and VMK95 porcelain were used for metal- porcelain bond strength measurement, in the same time the interface of metal- porcelain and element distribution were also observed. Results The flexural bonding strength of metal- porcelain of sputtering group and control group were（180.55±16.45）MPa and （143.80±24.49）MPa. The flexural bonding strength of metal - porcelain of sputtering group was higher than control group significantly through statistical analysis（P<0.01）. Conclusion The plasma magnetron reactive sputter deposition technique has a positive effect in improving the bonding strength of DA9- 4 dental alloy and ceramic.

Key words: plasma magnetron reactive sputter deposition technique, cobalt- chromium alloy, bonding strength