title: Damage and reliability of Y-TZP after cementation surface treatment.
abstract: Zirconia-based restorations are widely used in prosthetic dentistry, but their susceptibility to post-sintering cementation surface treatments remains controversial. We hypothesized that grinding (600-grit) and alumina abrasion (50 microm, 5 sec, 0.5 MPa) affect the damage modes and reliability of zirconia core material. Monolithic CAD/CAM-machined and sintered Y-TZP plates (0.5 mm thickness) were adhesively cemented to dentin-like composite substrates. Uni-axial mouth-motion cyclic contact was applied through a tungsten carbide spherical indenter (r = 3.18 mm). Results showed that zirconia core ceramic is vulnerable to lower surface radial fracture after grinding or alumina abrasion, while the as-received control chiefly fractured from load-application surface cone fracture. Significantly lower reliability of ground and alumina-abraded compared with the as-received zirconia core ceramic can be attributed to damage induced on the cementation surface. Clinical relevance concerning surface treatment protocols for zirconia framework materials prior to cementation is addressed.
authors.affiliation: Department of Prosthodontics, Albert-Ludwigs-University, Freiburg, Germany. petra.guess@uniklinik-freiburg.de
authors.forename: P C
authors.initials: PC
authors.lastname: Guess
authors.forename: Y
authors.initials: Y
authors.lastname: Zhang
authors.forename: J-W
authors.initials: JW
authors.lastname: Kim
authors.forename: E D
authors.initials: ED
authors.lastname: Rekow
authors.forename: V P
authors.initials: VP
authors.lastname: Thompson
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D002484:Cementation / Q000379:methods*; D003188:Composite Resins / Q000737:chemistry; D017076:Computer-Aided Design; D045662:Dental Etching / Q000379:methods*; D003764:Dental Materials / Q000737:chemistry; D003775:Dental Polishing / Q000379:methods; D003776:Dental Porcelain / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure; D018130:Diamond / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008859:Microscopy, Polarization; D019279:Resin Cements / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors; D017973:Tungsten Compounds / Q000737:chemistry; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction; D015019:Yttrium / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D008689:Methacrylates; D019279:Resin Cements; D017973:Tungsten Compounds; C499362:yttria stabilized tetragonal zirconia; D014867:Water; C002802:tungsten carbide; D003776:Dental Porcelain; C100646:Metal Primer; D015019:Yttrium; D018130:Diamond; D015040:Zirconium; D000537:Aluminum Oxide