title: [The effects of the multiple structural layer of Ti-cast on bond of porcelain fused to titanium].
abstract: OBJECTIVE
  To study the effects of the multiple structural layer of Ti-cast on the bond of porcelain fused to titanium.
  
  
  METHODS
  The interfacial state and bond strength of porcelain-titanium were observed by EPM analysis and a shear test.
  
  
  RESULTS
  The results showed cracks were observed in the interface of porcelain-titanium in R1 (the group of multiple structural layer of Ti-cast), but there were no cracks in the interface of porcelain-titanium in R2 (the group of removed multiple structural layer from Ti-cast) and R3 (the group of wrought titanium). The width of elemental diffusion layer of R1, R2 and R3 were 29.03 microns, 6.90 microns and 7.01 microns respectively. The shear bond srength of R1, R2 and R3 were 29.45 MPa, 52.75 MPa and 48.32 MPa respectively. There were significant difference in the width of elemental diffusion layer and shear bond strength between R1 and R2, R3 (P < 0.01).
  
  
  CONCLUSIONS
  This investigation indicates that the multiple structural layer of Ti-cast should be removed before firing of porcelain.
authors.affiliation: School of Stomatology, Fourth Military Medical University, Xi'an 710032.
authors.forename: H
authors.initials: H
authors.lastname: He
authors.forename: C
authors.initials: C
authors.lastname: Shi
authors.forename: T
authors.initials: T
authors.lastname: Guo
mesh_terms: D003735:Dental Casting Technique; D003776:Dental Porcelain; D014025:Titanium
chemical_list: D003776:Dental Porcelain; D014025:Titanium