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

Abstract EN

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 (P>0.05) was found at four marker points of each group.

For internal fit, no significant difference (P>0.05) was found between two groups, whereas significant difference (P<0.01) 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.