title: Surface agents' influence on the flexural strength of bilaminated ceramics.
abstract: The objective of this study was to evaluate the influence of different surface agents on the flexural strength of a ceramic system. Eighty bar-shaped specimens of zirconia were divided into four groups according to the agent to be used: group Control--to be cleaned with alcohol; group VM9--application of a fluid layer of porcelain; group Effect Bonder--application of a bonding agent; and group Coloring Liquid--application of coloring liquid. All specimens received the porcelain application by the layering technique and were then subjected to thermocycling. The four-point bending test was performed to calculate the strength values (σ, MPa) and the failure modes were classified. ANOVA did not detect significant differences among the groups. The Weibull modulus were 5 (Control, VM9 and Effect Bonder) and 6 (Coloring Liquid). The cracking of the porcelain ceramic toward the interface was the predominant failure mode. It was concluded that the surface agents tested had no effect on the flexural strength of the bilaminated ceramic specimens.
authors.affiliation: Graduate Program in Restorative Dentistry, Instituto de Ciência e Tecnologia-ICT, Univ Estadual Paulista-UNESP, São José dos Campos, SP, Brazil. jucostalima@hotmail.com
authors.forename: Júlia Magalhães Costa
authors.initials: JM
authors.lastname: Lima
authors.forename: Lilian Costa
authors.initials: LC
authors.lastname: Anami
authors.forename: Marília Pivetta
authors.initials: MP
authors.lastname: Rippe
authors.forename: Renata Marques
authors.initials: RM
authors.lastname: de Melo
authors.forename: Marco Antonio
authors.initials: MA
authors.lastname: Bottino
authors.forename: Márcia Carneiro
authors.initials: MC
authors.lastname: Valera
authors.forename: Maria Amélia Máximo
authors.initials: MA
authors.lastname: Araújo
mesh_terms: D000704:Analysis of Variance; D002516:Ceramics / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry; D019232:Dental Restoration Failure; D003801:Dental Veneers; D006358:Hot Temperature; D008422:Materials Testing; D018583:Pliability / Q000187:drug effects; D013314:Stress, Mechanical; D013499:Surface Properties / Q000187:drug effects; D013718:Tensile Strength / Q000187:drug effects; D013997:Time Factors; D015019:Yttrium / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry*
chemical_list: D003764:Dental Materials; C499362:yttria stabilized tetragonal zirconia; D015019:Yttrium; D015040:Zirconium