Effects of hydrolysis on physical properties of the low-fusing and heat-pressed ceramics
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The purpose of this investigation was to study the resistance to acid degradation of four low-fusing ceramic materials (Duceram-LFC, Finesse, Vita Omega900, and Sensation), two heat-pressed ceramic materials (Cerpress SL and IPS Empress), and a conventional feldspathic ceramic (Vita Omega). The weight loss, flexural strength, modulus of elasticity, fracture toughness, and microhardness before and after a standard hydrolysis test (ISO 6872) was measured for all materials tested. Twenty bars (1.5x2.0x25mm) of each low-fusing ceramic were fabricated from both dentin and enamel powders. Thirty bars of each heat-pressed ceramic were heat pressed from both layering and staining ingots according to manufacturer′s recommendations. Bars were randomly assigned to a control and treatment group. Treatment groups were weighed before and after placement in a Soxhlet extraction device containing a 4% acetic acid solution heated up to 80[degrees]C for 16 hours. A four point bending was applied to all bars using an Instron with a crosshead speed of 0.5mm/min. [TRUNCATED]
PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please click Download and log in with a valid BU account to access. If you are the author of this work and would like to make it publicly available, please contact email@example.com.Dissertation (DScD) --Boston University Henry M. Goldman School of Dental Medicine, 1999 (Prosthodontics).Includes bibliographic references: leaves 193-207.
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