title: The effect of staining and vacuum sintering on optical and mechanical properties of partially and fully stabilized monolithic zirconia.
abstract: The effect of staining and vacuum sintering on optical properties and the bi-axial flexural strength of partially and fully stabilized monolithic zirconia (PSZ, FSZ) were evaluated. Disc-shaped specimens divided into three subgroups (n=15): non-stained, stained and non-stained with vacuum sintering. After staining and sintering, optical properties were evaluated using a reflection spectrophotometer and bi-axial flexural strength was tested using the piston-on-three balls technique. Statistical analysis was performed using multivariate analysis of variance (MANOVA) followed by post-hoc Tukey's tests (p<0.05). Staining decreased translucency parameter (TP) values of FSZ (p<0.05). Sintering under vacuum enhanced TP values for PSZ (p<0.05). Staining enhanced surface gloss for both types of zirconia (p<0.05). Staining increased bi-axial flexural strength of FSZ (p<0.05), while it decreased the strength of PSZ (p<0.05). Sintering under vacuum provided minimal benefits with either type of zirconia.
authors.affiliation: Department of Prosthetic Dentistry and Biomaterials Science, Institute of Dentistry.
authors.forename: Taiseer A
authors.initials: TA
authors.lastname: Sulaiman
authors.forename: Aous A
authors.initials: AA
authors.lastname: Abdulmajeed
authors.forename: Terrence E
authors.initials: TE
authors.lastname: Donovan
authors.forename: Pekka K
authors.initials: PK
authors.lastname: Vallittu
authors.forename: Timo O
authors.initials: TO
authors.lastname: Närhi
authors.forename: Lippo V
authors.initials: LV
authors.lastname: Lassila
mesh_terms: D002516:Ceramics / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003799:Dental Stress Analysis; D008422:Materials Testing; D055595:Mechanical Phenomena; D013499:Surface Properties; D014618:Vacuum; D015040:Zirconium / Q000737:chemistry*
chemical_list: D003764:Dental Materials; D015040:Zirconium; C028541:zirconium oxide