title: Sliding contact fatigue of graded zirconia with external esthetic glass.
abstract: Veneer chipping and fracture are common failure modes for porcelain-veneered zirconia dental restorations. We hypothesized that the graded glass/zirconia/glass with external esthetic glass (e-GZG) can increase the lifetime and improve resistance to veneer chipping and fracture relative to porcelain-veneered zirconia, while providing necessary esthetics. Previously, we have demonstrated that a graded glass-zirconia surface possesses excellent resistance to occlusal-like sliding contact fatigue. Here, we investigated the sliding contact fatigue response of this graded glass-zirconia surface with external esthetic glass. This external glass is essential for shade options, for preventing excessive wear of opposing dentition, and for protecting Y-TZP from hydrothermal degradation. e-GZG plates were bonded to composite blocks and subjected to prolonged sliding contact up to 10 million cycles at 200 N in water. The resistance to sliding contact fatigue of e-GZG matches that of monolithic Y-TZP, and both of these materials demonstrated lifetimes that were orders of magnitude longer than that of porcelain-veneered zirconia. Graded e-GZG is a promising restorative material.
authors.affiliation: Department of Biomaterials and Biomimetics, New York University College of Dentistry, 345 East 24th Street, New York, NY 10010, USA.
authors.forename: L
authors.initials: L
authors.lastname: Ren
authors.forename: M N
authors.initials: MN
authors.lastname: Janal
authors.forename: Y
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D003442:Crowns; D003776:Dental Porcelain / Q000737:chemistry; D019232:Dental Restoration Failure; D019554:Dental Restoration Wear; D003799:Dental Stress Analysis; D003801:Dental Veneers; D005898:Glass; D008422:Materials Testing; D018583:Pliability; D013314:Stress, Mechanical; D015040:Zirconium / Q000737:chemistry
chemical_list: D003776:Dental Porcelain; D015040:Zirconium; C028541:zirconium oxide