title: Damage maps of veneered zirconia under simulated mastication.
abstract: Zirconia-based restorations often fracture from chipping and/or delamination of the porcelain veneers. We hypothesized that veneer chipping/delamination is a result of the propagation of near-contact-induced partial cone cracks on the occlusal surface under mastication. Masticatory loading involves the opposing tooth sliding along the cuspal inner incline surface with an applied biting force. To test this hypothesis, we cemented flat porcelain-veneered zirconia plates onto dental composites and cyclically loaded them (contact-slide-liftoff) at an inclination angle as a simplified model of zirconia-based restorations under occlusion. In light of in situ observation of damage evolution in a transparent glass/zirconia/polycarbonate trilayer, post mortem damage evaluation of porcelain/zirconia/composite trilayers by a sectioning technique revealed that deep-penetrating occlusal surface partial cone fracture is the predominant fracture mode of porcelain veneers. Clinical relevance is discussed.
authors.affiliation: Department of Biomaterials and Biomimetics, New York University College of Dentistry, 345 East 24th Street, New York, NY 10010, USA.
authors.forename: J-W
authors.initials: JW
authors.lastname: Kim
authors.forename: J-H
authors.initials: JH
authors.lastname: Kim
authors.forename: M N
authors.initials: MN
authors.lastname: Janal
authors.forename: Y
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D001732:Bite Force; D017610:Calcium Compounds / Q000737:chemistry; D017554:Carbon Compounds, Inorganic / Q000737:chemistry; D002484:Cementation / Q000379:methods; D003188:Composite Resins / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry; D003776:Dental Porcelain / Q000737:chemistry*; D003801:Dental Veneers; D004853:Epoxy Resins / Q000737:chemistry; D005898:Glass / Q000737:chemistry; D006801:Humans; D008409:Mastication / Q000502:physiology*; D008422:Materials Testing; D010087:Oxides / Q000737:chemistry; D011076:Polycarboxylate Cement / Q000737:chemistry; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D017655:Silicon Compounds / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D012972:Sodium Hydroxide / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D015040:Zirconium / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D017554:Carbon Compounds, Inorganic; D003188:Composite Resins; D003764:Dental Materials; D004853:Epoxy Resins; D010087:Oxides; D011076:Polycarboxylate Cement; D011109:Polymethacrylic Acids; C462240:RelyX ARC; D019279:Resin Cements; D017655:Silicon Compounds; C083568:Z100 composite resin; D003776:Dental Porcelain; C005506:polycarbonate; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate; C004569:soda lime; D012972:Sodium Hydroxide; D012822:Silicon Dioxide; D015040:Zirconium; C028541:zirconium oxide; C022088:silicon carbide