title: Al2O3/GdAlO3 fiber for dental porcelain reinforcement.
abstract: The aim of this study was to test the hypothesis that the addition of continuous or milled GdAlO3/Al2O3 fibers to a dental porcelain increases its mechanical properties. Porcelain bars without reinforcement (control) were compared to those reinforced with long fibers (30 vol%). Also, disk specimens reinforced with milled fibers were produced by adding 0 (control), 5 or 10 vol% of particles. The reinforcement with continuous fibers resulted in significant increase in the uniaxial flexural strength from 91.5 to 217.4 MPa. The addition of varied amounts of milled fibers to the porcelain did not significantly affect its biaxial flexural strength compared to the control group. SEM analysis showed that the interface between the continuous fiber and the porcelain was free of defects. On the other hand, it was possible to note the presence of cracks surrounding the milled fiber/porcelain interface. In conclusion, the reinforcement of the porcelain with continuous fibers resulted in an efficient mechanism to increase its mechanical properties; however the addition of milled fibers had no significant effect on the material because the porcelain was not able to wet the ceramic particles during the firing cycle.
authors.affiliation: Departamento de Materiais Dentários, Instituto de Física de São Carlos, Universidade de São Paulo, São Paulo, Brazil. igorsm@usp.br
authors.forename: Igor S
authors.initials: IS
authors.lastname: Medeiros
authors.forename: Luciana A
authors.initials: LA
authors.lastname: Luz
authors.forename: Humberto N
authors.initials: HN
authors.lastname: Yoshimura
authors.forename: Paulo F
authors.initials: PF
authors.lastname: Cesar
authors.forename: Antonio C
authors.initials: AC
authors.lastname: Hernandes
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D055119:Elastic Modulus; D005682:Gadolinium / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D016474:Weight-Bearing
chemical_list: D003776:Dental Porcelain; D005682:Gadolinium; D000537:Aluminum Oxide