Effect Of Cold Atmospheric Plasma On Microstructure And Bonding Strength Of Pure Titanium And Zirconia

Objective: Some mechanical complications may occur in the long-term use of implant restoration.In clinical practice,except for the anterior teeth,zirconia base table is considered to be used for conventional titanium base table.Zirconia crown with good mechanical strength and aesthetic appearance was selected for the upper restoration,and was bonded with self-adhesive resin cement.In this experiment,a new cold atmospheric plasma treatment technology was used to explore its influence on the microstructure and bonding strength of pure titanium and zirconia.Methods: The effects of cold atmospheric plasma treatment on the bonding strength of pure titanium and zirconia were studied by three comparative experiments.Experiment one: The titanium specimens were treated with cold atmospheric plasma,and the experiments were divided into 6 groups according to the treatment time.The surface morphology observation,element analysis,contact Angle measurement,bonding strength measurement of titanium and zirconia,and fracture mode analysis of bonding surface were carried out for each group of titanium specimens.SPSS 22.0 was used for statistical analysis of measurement data.Experiment two: Zirconia samples were treated with cold atmospheric plasma,and the samples were divided into 6 groups according to the time of zirconia treatment.The surface morphology observation,element analysis,contact Angle measurement,bonding strength measurement of titanium and zirconia,and fracture mode analysis of bonding surface were carried out for each group of zirconia samples.SPSS22.0 was used for statistical analysis of measurement data.Experiment three: Cold atmospheric plasma treatment of zirconia and titanium specimens,and bonding strength measurement and bonding surface fracture mode analysis.SPSS 22.0 was used for statistical analysis of measurement data.Results: 1.Experimental results of cold atmospheric plasma treatment on titanium specimens: cold atmospheric plasma treatment had no effect on the surface morphology and roughness of titanium specimens;The surface contact Angle can be reduced,so that the surface of the specimen from hydrophobic to hydrophilic,oxygen-containing polar groups increased.After cold atmospheric plasma treatment,the adhesion betweentitanium specimen and resin adhesive was enhanced,and almost all of the adhesive remained on the surface of titanium specimen after fracture.2.Experimental results of cold atmospheric plasma treatment on zirconia samples: after cold atmospheric plasma treatment on zirconia samples,the surface morphology and roughness of the samples did not change;Surface contact Angle decreased and hydrophilicity increased.The adhesion between zirconia specimen and resin adhesive was enhanced.The percentage of bonding strength of zirconia treated specimens is higher than that of titanium treated specimens.3.Experimental results of cold atmospheric plasma treatment of titanium specimen and zirconia specimen: the bonding strength of titanium specimen and zirconia specimen was higher than that of zirconia specimen,titanium specimen and zirconia specimen without treatment.Conclusions: 1.Cold atmospheric plasma treatment of titanium specimen and zirconia specimen can introduce a large number of high-energy charged particles,free radicals and polar groups containing oxygen on the surface to enhance the hydrophilicity and surface energy of the specimen.The bonding strength between titanium specimen and resin adhesive and zirconia specimen and resin adhesive was enhanced.This method has the advantage of simple operation and time saving.2.The bonding strength of pure titanium and zirconia treated with cold atmospheric plasma was significantly enhanced compared with that without treatment,and the bonding effect was higher than that of zirconia and pure titanium treated with cold atmospheric plasma.