Development of resin-ceramic interpenetrating phase composites
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The feasibility of infiltration as a technique for producing resin-ceramic interpenetrating phase composites (RCIPC) was examined. Using a colloidal processing technique, Vita MK powder was pressed to fabricate ceramic billets. Testing bars were then sectioned from the billet and fired in various sintering protocols. The linear shrinkage and relative density of the bars were measured. Microstructures of selected specimens were examined by scanning electron microscopy. The results showed that the materials with relative densities less than 60% have the potential to be used as matrix materials for second phase infusion. The effects of silane treatment of porous ceramic matrix (60% relative density) and post-cured heat treatments of infused RCIPC were evaluated by three-point flexural strength measurement. The results showed that both silane coating and post-cured heat treatments improved the strength of RCIPC. Based on the results, an optimal infusion protocol was proposed. Six groups of ceramic matrix specimens were sintered for 5 minutes at different temperatures. Using the proposed infusion protocol, six groups of specimens were infiltrated and tested in three-point flexure. The highest strength in this study was 193 MPa from 975 degrees C group, which was higher than most of the all-ceramic systems. Both 975 and 1000 degrees C groups showed relatively high Weibull modulus values, which represented homogeneous properties of the new RCIPC. [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 firstname.lastname@example.org.Thesis (D.Sc.D.)--Boston University, Henry M. Goldman School of Graduate Dentistry, 1996 (Prosthodontics).Includes bibliographical references: (leaves 169-171).
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