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The International Journal of Prosthodontics
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Int J Prosthodont 31 (2018), No. 4     3. July 2018
Int J Prosthodont 31 (2018), No. 4  (03.07.2018)

Page 367-369, doi:10.11607/ijp.5720, PubMed:29953568


Analysis of the Marginal Fit and Dimensional Stability of Cast-to Cobalt-Chromium Implant Cylinders Cast from Different Alloys
Fulginiti, Roberta Limeira / Grossi, Márcio Lima / Ozkomur, Ahmet / Rodrigues Neto, Dimas João / Shinkai, Rosemary Sadami Arai / Teixeira, Eduardo Rolim
Purpose: To evaluate the influence of cobalt-chromium (Co-Cr) casting alloys' melting temperatures on the cast-to Co-Cr implant cylinders' marginal fit.
Materials and Methods: Co-Cr alloys with different melting ranges were cast into 20 Co-Cr cylinders: 10 in a high-melting temperature (HMT) group and 10 in a low-melting temperature (LMT) group. Ten cylinders were used as received as a control group. Cylinders' marginal misfit and dimensional stability were evaluated using scanning electron microscopy (×500).
Results and Conclusion: HMT cylinders showed significant differences in marginal misfit (2.48 ± 1.07 μm2) compared to LMT (1.53 ± 0.37 μm2) and control (1.27 ± 0.57 μm2) cylinders, but there were no differences in dimensional stability. HMT Co-Cr alloys produce implant-supported prostheses with poor marginal fit.