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BioMed Research International
Volume 2017 (2017), Article ID 5807304, 9 pages
Research Article

Evaluation of Mechanical Properties and Marginal Fit of Crowns Fabricated Using Commercially Pure Titanium and FUS-Invest

1Department of Stomatology, Chinese PLA General Hospital, Beijing 100853, China
2Department of Stomatology, People’s Hospital of Yuxi City, Yuxi 653100, China
3Department of Prosthodontics, Anyang Sixth People’s Hospital, Anyang 45500, China
4State Key Laboratory of Military Stomatology, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi’an 710032, China
5Institute of New Materials Technology, Beijing University of Science and Technology, Beijing 100853, China

Correspondence should be addressed to Sefei Yang

Received 19 May 2017; Revised 26 June 2017; Accepted 12 July 2017; Published 23 August 2017

Academic Editor: Nick Silikas

Copyright © 2017 Jinshuang Wu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This study investigated the mechanical properties and single crown accuracy of the tailor-made Fourth University Stomatology investment (FUS-invest) for casting titanium. Background. Current investment for casting titanium is not optimal for obtaining high-quality castings, and the commercially available titanium investment is costly. Methods. Titanium specimens were cast using the tailor-made FUS-invest. The mechanical properties were tested using a universal testing machine. Fractured castings were characterized by energy-dispersive spectroscopy. 19 titanium crowns were produced using FUS-invest and another 19 by Symbion. The accuracy of crowns was evaluated. Results. The mechanical properties of the titanium cast by FUS-invest were elastic modulus 125.6 ± 8.8 GPa, yield strength 567.5 ± 11.1 MPa, tensile strength 671.2 ± 15.6 MPa, and elongation 4.6 ± 0.2%. For marginal fit, no significant difference () was found at four marker points of each group. For internal fit, no significant difference () was found between two groups, whereas significant difference () was found at different mark point of each group. Conclusions. The mechanical properties of titanium casted using FUS-invest fulfilled the ISO 9693 criteria. The marginal and internal fit of the titanium crowns using either the FUS-invest or Symbion were similar.