An investigation of the mechanical properties of a new ceramo-metal restoration (Captek)
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The Captek metal-ceramic system is based upon the formation of an interpenetrating Au-Au/Pt/Pd network. The technique consists of sintering Au/Pt/Pd onto the refractory die to form a porous network which is then infused with molten Au. This study compares the marginal accuracy of Captek crowns and three unit bridges with conventional metal-ceramic restorations; the maximum compressive load that the Captek crowns and three unit bridges (with and without porcelain bonding agent) can sustain in comparison to corresponding conventional metal ceramic crowns and bridges, and the ceramo-metal bond strength. A maxillary central incisor crown preparation was produced on an ivorine tooth with a circumferential chamfer margin of 1.2 mm on the labial, 0.8mm on the lingual and blend type at the proximal. Thirty identical replicas of the master dies were cast in metal upon which the crowns were fabricated. A master model for the three unit bridge with premolar and molar abutment and pontic space was fabricated. Identically contoured porcelain fused to metal crowns and bridges were fabricated according to the manufacturer's instruction into three groups: Group A.) Conventional porcelain fused to high noble metal-ceramic alloy, Group B.) Captek with porcelain bonding agent, Group C.) Captek without porcelain bonding agent. The crown and bridge contours were standardized using jigs. Marginal opening was measured at fourteen locations on both bridge abutments and at eight locations on the crowns at 100X using a traveling microscope. The mean marginal gap of the crowns (UM) is: Group A.) 17.13[plus or minus]3.34, Group B.) 14.7[plus or minus]2.91, Group C.) 14.41[plus or minus]3.06. The mean marginal gap of the bridges (UM) are: Group A.) 21.38[plus or minus]3.60, Group B.) 17.64[plus or minus]3.54, Group C.) 17.62[plus or minus]3.82. ANOVA and Newman-Keuls test revealed a statistically significant difference in marginal fit at p[less than]0.05 in both crown and bridge groups. All crowns were cemented to their respective dies as well as bridges were cemented to bridge supporting models with zinc phosphate cement and positioned in an Instron so that a compressive load was applied at a cross head speed of 0.5 mm/min. The loading force at the initial crack and at catastrophic failure were recorded for bridges and at failure for crowns. The mean load bearing capacity at initial crack and at failure for bridges (kg) is: Group A.) 192.71[plus or minus]17.24 and 213.49[plus or minus]29.43, Group B.) 191.75[plus or minus]15.4 and 210.28[plus or minus]22.01, Group C.) 193.58[plus or minus]8.27 and 216.97[plus or minus]13.10. The mean fracture load (kg) for crowns is: Group A.) 74.20[plus or minus]14.54, Group B.) 74.75[plus or minus]15.92, Group C.) 74.38[plus or minus]8.93. ANOVA and Newman-Keuls test revealed no statistically significant difference in load bearing capacity at p[less than]0.05 between experimental group in each category of restoration. [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, 1995.Includes bibliographical references (leaves 295-315)
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