| 0889 Marginal fit of the CAD/CAM fabricated Zirconia frameworks | ||
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J. KUNII, Y. HOTTA, Y. TAMAKI, A. OZAWA, Y. KOBAYASHI, A. FUJISHIMA, Y. SHIMAKURA, T. MIYAZAKI, and T. KAWAWA, Showa University, Tokyo, Japan Objective: Recently, ceramic bridge restorations produced by a dental CAD/CAM system has been available because of the innovation of highly reinforced ceramics for frameworks. Since these ceramics need a sintering process after the CAD/CAM process, the accuracy of frameworks highly depends on the CAD/CAM system available. The aim of this study was to determine the marginal fit of the Zirconia frameworks produced by the newly developed CAD/CAM system. Methods: A Five-unit bridge model (APAPA, A=abutment, P=pontic) was prepared. The abutment teeth made of stainless steel were fixed to the metal mold at an interval of 10.0mm. A stone model for digitizing was copied from the master model. Zirconia frameworks were fabricated by the CAD/CAM system (KATANA®, NORITAKE DENTAL SUPPLY CO., LTD., Japan). Fabricated Zirconia frameworks were sintered at 1350°C finally, and were cemented to the original metal abutment using a resin luting cement, followed by embedding in an acrylic resin and sectioning by the mesio-distal direction. The marginal gap was observed on each measuring point. (Tinschert et al., Oper Dent 2001) Three frameworks were reproduced and the data were analyzed with Tukey¢s Multiple Comparison test at p<0.05. Results: The average marginal gap of the pontic side was 14.5μm(SD 14.9) and that of the non-pontic side was 12.8μm(SD 9.0). There was no statistically significant difference between the two groups. Since SD of the gap of pontic side was larger than that of non-pontic side , the marginal fit of the frameworks might be affected by the shrinkage of the pontic at sintering. Whereas, these gap values were equivalent or superior to that expressed in the literature (Hertlein et. al 2006 , Beuer et. al 2005). Conclusions: The newly developed KATANA® CAD/CAM system produced the Zirconia frameworks with an excellent marginal fit for a five-unit bridge model (APAPA).
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| Seq #107 - Ceramics: Mechanical Properties and Marginal Fit 3:30 PM-4:45 PM, Thursday, March 22, 2007 Ernest N. Morial Convention Center Exhibit Hall I2-J | ||
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