title: Effect of intermediate fiber layer on the fracture load and failure mode of maxillary incisors restored with laminate veneers.
abstract: This study evaluated the fracture load and failure mode of various veneer materials cemented with or without the addition of a fiber-reinforced composite (FRC) layer at the adhesive interface. Sixty intact incisors were randomly divided into three groups. Group 1 was fabricated with the heat-press technique (IPS Empress 2); Group 2 with the copy milling technique (ZirkonZahn); and Group 3 with the direct or indirect composite technique (Z250)--and specimens were cemented either with or without FRC at the adhesive interface. The specimens were thermocycled and tested with a universal testing machine. No significant differences in fracture load (p>0.05) were found among the various veneer materials. The addition of FRC at the adhesive layer did not lead to significant differences in the fracture load (p>0.05) but resulted in differences in the failure mode. Laminate veneers made of composite, zirconia, and Empress 2 showed comparable mean fracture loads. However, the use of FRC at the interface changed their failure modes.
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, Suleyman Demirel University, Isparta, Turkey.
authors.forename: Suha
authors.initials: S
authors.lastname: Turkaslan
authors.forename: Arzu
authors.initials: A
authors.lastname: Tezvergil-Mutluay
authors.forename: Bora
authors.initials: B
authors.lastname: Bagis
authors.forename: Akikazu
authors.initials: A
authors.lastname: Shinya
authors.forename: Pekka K
authors.initials: PK
authors.lastname: Vallittu
authors.forename: Lippo V
authors.initials: LV
authors.lastname: Lassila
mesh_terms: D000134:Acid Etching, Dental; D002484:Cementation; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry; D003776:Dental Porcelain / Q000737:chemistry; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis / Q000295:instrumentation; D003801:Dental Veneers; D006801:Humans; D007180:Incisor; D018020:Lithium Compounds / Q000737:chemistry; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D019904:Polymethyl Methacrylate / Q000737:chemistry; D012821:Silanes / Q000737:chemistry; D013314:Stress, Mechanical; D013696:Temperature; D013997:Time Factors; D015040:Zirconium / Q000737:chemistry
chemical_list: C515607:Bifix composite; D003188:Composite Resins; D003764:Dental Materials; C118557:Empress 2; C444701:Filtek Z250; D018020:Lithium Compounds; D008689:Methacrylates; D012821:Silanes; C488002:Solobond Plus adhesive; C485628:Stick resin; D003776:Dental Porcelain; D019904:Polymethyl Methacrylate; D015040:Zirconium; C028541:zirconium oxide