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The Influence of Microwave Sintering Process on the Adaptation of CAD/CAM Zirconia Core  

Kim, Keun Bae (Department of prosthodontics, college of Dentistry, Yonsei University)
Kim, Jee Hwan (Department of prosthodontics, college of Dentistry, Yonsei University)
Lee, Keun-Woo (Department of prosthodontics, college of Dentistry, Yonsei University)
Publication Information
Journal of Dental Rehabilitation and Applied Science / v.25, no.2, 2009 , pp. 95-107 More about this Journal
Abstract
The purpose of this research was to examine the fitness of zirconia cores that were made by different sintering methods; generic electricity furnace and microwave furnace. Firstly, 12 cores for each group were made by using each different sintering process and attached them to a metal die with silicon. The internal and marginal gap of sintered zirconia was measured by using Skyscan 1076 micro-CT, then it was reorganized by CT-An software. To each samples, we extracted B-L image, M-D image of cutting side, and cross-sectional side of tooth long axis and calculated the mean value of marginal, axial, and occlusal gap each side. Results: 1. The mean marginal gap of sintered zirconia was $36.20{\mu}m$ for EVE, $47.67{\mu}m$ for LAV, $52.47{\mu}m$ for DEN, and $54.63{\mu}m$ for CER. 2. For the axial wall, the research showed the largest value of $63.49{\mu}m$ for EVE, but there were no statistical significance. 3. In related to the occlusal internal measurement, DEN showed the smallest value ($77.06{\mu}m$), EVE and CER showed significantly high value. From this study, it is suggested that CAD/CAM zirconia core which was made in the process of microwave sintering has clinically acceptable values in marginal and internal gap.
Keywords
microwave sintering; CAD/CAM; zirconia; marginal and internal fit; micro-CT;
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