Bonding strength,bonding failure mode,surface and bonding interface characteristics of 3D printed porous titanium alloy posts
Objective To observe the bonding strength,bonding failure mode,surface and bonding interface char-acteristics of 3D printed porous titanium alloy posts,in order to improve the bonding strength of metal posts by utilizing me-chanical interlocking of porous structures.Methods Four experimental groups were designed.In the group A,we se-lected 10 preformed fiber posts,scanned and obtained three-dimensional data.In the groups B,C,and D,we used the data obtained from group A to design and manufacture 3D printed solid titanium alloy posts,3D printed porous titanium alloy posts,and zirconia posts.The posts were embedded and sliced,and the posts were pushed out of the resin using a universal mechanical testing machine.The bonding strength and bonding failure mode of posts in each group were record-ed,and the surface and bonding interface characteristics of the posts were observed using a scanning electron micro-scope.Results The adhesive strengths of groups A,B,C,and D were(229.11±80.15),(389.29±58.39),(572.35±1280.8),and(137.54±26.81)MPa,respectively,with statistically significant difference between every two groups(all P<0.05).The numbers of cases of adhesive interface failure in the groups A,B,C,and D were 7,2,1,and 8,respectively;the numbers of cases of internal adhesive failure were 0,1,3,and 0,respectively;the numbers of cases of mixed adhesive failure were 3,7,6,and 2,respectively;there were statistically significant differences between every two groups(all P<0.05).Under the scanning electron microscope,in the group A,a large number of tightly arranged fi-ber bundles were seen on the surface of the fiber post,and the fiber post was tightly bonded to the post core resin;in the group B,there were a large number of spot-shaped particles on the surface of the 3D printed solid titanium alloy posts,with resin embedded between the spot-shaped particles,and the titanium alloy solid post was tightly bonded to the post-core res-in;in the group C,there were a large number of irregular voids on the surface of 3D printed porous titanium alloy posts,and there were also a large number of spot-shaped particles on the surface of the posts.A large amount of resin embedded was seen between the particles and the voids,greatly increasing the mechanical interlocking effect between the posts and the core resin;in the group D,the zirconia posts and surface were relatively flat,and the posts and core resin were tightly bonded,with significantly less mechanical interlocking than that of the previous three groups.Conclusions Compared with the preformed fiber posts,zirconia posts,and 3D printed solid titanium alloy posts,porous titanium alloy posts made using 3D printing technology have significantly improved bonding strength.The bonding failure mode is mainly the mixed bonding failure,with a large number of irregular voids and spot-shaped particles on the post surface.A large amount of res-in embedded can be seen between the particles and voids,greatly increasing the mechanical interlocking effect between the posts and the resin.
万方数据
维普
