Dental materials : official publication of the Academy of Dental Materials · 2011
Residual stress measurement in veneering ceramic by hole-drilling.
Сравнительное исследованиеСтатьяНазвание и аннотация: Перевод в очереди
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Mainjot Amélie K, Schajer Gary S, Vanheusden Alain J, Sadoun Michaël J
Аннотация
OBJECTIVES: Mismatch in thermal expansion properties between veneering ceramic and metallic or high-strength ceramic cores can induce residual stresses and initiate cracks when combined with functional stresses. Knowledge of the stress distribution within the veneering ceramic is a key factor for understanding and predicting chipping failures, which are well-known problems with Yttria-tetragonal-zirconia-polycrystal based fixed partial dentures. The objectives of this study are to develop a method for measuring the stress profile in veneering ceramics and to compare ceramic-fused-to-metal compounds to veneered Yttria-tetragonal-zirconia-polycrystal ceramic.
METHODS: The hole-drilling method, often used for engineering measurements, was adapted for use with veneering ceramic. Because of the high sensitivity needed in comparison with industrial applications, a high sensitivity electrical measurement chain was developed.
RESULTS: All samples exhibited the same type of stress vs. depth profile, starting with compressive at the ceramic surface, decreasing with depth and becoming tensile at 0.5-1.0mm from the surface, and then becoming slightly compressive again. The zirconia samples exhibited a stress depth profile of larger magnitude.
SIGNIFICANCE: The hole drilling method was shown be a practical tool for measuring residual stresses in veneering ceramics.
METHODS: The hole-drilling method, often used for engineering measurements, was adapted for use with veneering ceramic. Because of the high sensitivity needed in comparison with industrial applications, a high sensitivity electrical measurement chain was developed.
RESULTS: All samples exhibited the same type of stress vs. depth profile, starting with compressive at the ceramic surface, decreasing with depth and becoming tensile at 0.5-1.0mm from the surface, and then becoming slightly compressive again. The zirconia samples exhibited a stress depth profile of larger magnitude.
SIGNIFICANCE: The hole drilling method was shown be a practical tool for measuring residual stresses in veneering ceramics.
Предметные рубрики MeSH
Aluminum SilicatesCeramicsChromium AlloysComputer-Aided DesignCrownsDental EtchingDental PolishingDental PorcelainDental VeneersDenture, Partial, FixedElectric ConductivityHot TemperatureHumansMaterials TestingMetal Ceramic AlloysPotassium CompoundsStress, MechanicalSurface PropertiesThermodynamicsTransducersYttriumZirconium