| Objective: As an emerging metal material,titanium is widely used in various fields of the oral cavity,such as pure titanium implants,removable partial denture pure titanium stents,titanium post cores and pure titanium base porcelain crowns.Pure titanium is used as porcelain crown metal.The substrate has many advantages,but the bonding strength between the pure titanium substrate and the porcelain is relatively low,and the phenomenon of porcelain collapse often occurs clinically.The titanium-ceramic combination is an unresolved problem.In this experiment,electron beam deposition of nano-silica coating on the surface of pure titanium was used to explore the effect on the bonding strength of titanium-porcelainMethods: Divide 50 pieces of 25mm×3mm×0.5mm wire-cut titanium specimens into 5groups randomly,10 pieces in each group.The 5 groups of titanium pieces are polished,ultrasonically washed and sandblasted in sequence,and then evaporated by electron beam evaporation equipment.40nm(group A),60nm(group B),80nm(group C),100nm(group D)thickness of silicon dioxide film,the control group is only sandblasted specimens(group E),after coating and spraying only Each group of sand titanium sheets randomly selected2 coated test pieces,and observed the surface morphology of each group of pure titanium samples after coating treatment by scanning electron microscope(SEM),and randomly selected 3 areas for energy spectrum analysis(EDS),observe its element composition.After coating,each group randomly selects 6 pieces of porcelain,and performs three-point bending according to the requirements of ISO-9693 to evaluate the bonding strength of titanium porcelain.After the three-point bending test,the porcelain layer is separated from the pure titanium specimen,and the porcelain of each group is observed.For the residual status of porcelain powder on the surface of the zone,two samples were randomly selected from each group of samples after the porcelain was peeled off,and the surface morphology was observed by SEM,and the element analysis was performed by EDS.Use SEM to observe the morphology of the titanium-porcelain bonding interface,and perform linear scanning of the titanium-porcelain bonding interfaceResults: The bonding strength of the five groups of titanium porcelain is 31.14±1.43MPa(group A),38.15±0.52 MPa(group B),42.69±1.08 MPa(group C),46.28±0.94 MPa(group D),29.47±0.65 MPa(group E)).The three-point bending results showed that the titaniumceramic bonding strength of the three groups B,C,and D was significantly higher than that of the E group(P<0.05),and result show that a group was not significant compare with control group E.Among them,the bonding strength of titanium porcelain in group D is the highest.The surface topography of the experimental group and the control group under the scanning electron microscope.The surface of the control group is rough,uneven,and the shape is relatively irregular.Obvious cavities are visible,and the surface is relatively large.sharp.The surface morphology of the test pieces of each experimental group.No obvious cavities were seen on the surface of the test pieces after coating.The surface of the titanium sheet after sandblasting can be observed to the naked eye to be gray-black,while the titanium sheet of the experimental group is silver-gray,and the surface is brighter.Using EDS to analyze the surface of the coated titanium sheet,it can be seen that there are silicon and oxygen elements after the coating of the titanium sheet in each experimental group,which proves the existence of the surface film of the specimen after the electron beam evaporation,and the film layer As the thickness increases,the content of silicon and oxygen is increasing,while the content of titanium is decreasing.The bonding interface of titaniumceramics in the experimental group was relatively flat,without obvious pores and cavities.In the control group,the bonding interface is not smooth,there are obvious sharp protrusions,and the traces after sandblasting can be seen,indicating that the porcelain powder melting and the wettability of titanium are poor.Scanning electron microscopy and elemental analysis of the porcelain peeling surface and the titanium-porcelain bonding interface showed that the amount of residual porcelain powder on the surface of the experimental group was more than that of the control group.Conclusions: The bonding strength of titanium-porcelain can be improved by electron beam evaporation of nano-Si O2 coating on the surface of pure titanium.In this experiment,as the thickness of the film increases,the bonding strength between titanium and porcelain shows an upward trend,and 100 nm is the best thickness to improve the bonding strength of titanium and porcelain. |
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