An investigation of the dimensional accuracy of milled ceramic inlays and copings and the wear characteristics of the associated milling instruments
Date
1999
DOI
Authors
Takesuye, Jun
Version
OA Version
Citation
Abstract
Statement of problem. Two commercially available systems for making milled restorations are available, the Cerec (Siemens, Beinshein, Germany) and Celay (Mikrona, Spreitenbach, Switzerland) methods; nevertheless there are no published studies comparing the accuracy of the two systems.
Purposes. This study compared the marginal accuracies of inlays and copings made from Vita Mark II material with the use of the Cerec and Celay systems as well as alumina copings made with the two systems. The wear of the diamond cutting tools and the milling time were also evaluated.
Material and methods. Two inlay groups and 5 coping groups with 15 samples in each group were fabricated according to the manufacturer’s instructions. The seven groups were composed of:
-Cerec inlays
-Celay inlays
-Cerec Vita Mark ll copings
-Celay Vita Mark ll copings
-Cerec alumina copings
-Celay alumina copings
-ln-Ceram conventional alumina copings
The marginal gaps of all samples were measured before and after cementation with a video micrometer on Swift stereomicroscope except for the three In-Ceram alumina coping groups that were glass infiltrated. Mean marginal gaps for the ln-Ceram alumina coping groups were measured before infiltration, after infiltration, and after cementation. New diamond cutting instruments were used after every 15 millings and the amount of wear of the cutting instruments was examined subjectively by scanning electron microscopy. Milling time for each milling was also recorded.
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Description
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Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Dental Medicine, 1999 (Prosthodontics).
Includes bibliographical references (leaves 129-133).
Thesis (M.Sc.D.)--Boston University, Henry M. Goldman School of Dental Medicine, 1999 (Prosthodontics).
Includes bibliographical references (leaves 129-133).
License
This work is protected by copyright. Downloading is restricted to the BU community. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.