Journal of Prosthetic Dentistry
Volume 92, Issue 4 , Pages 377-381, October 2004

Porosity of cpTi casting with four different casting machines

  • Dimitris Eliopoulos, DDS

      Affiliations

    • Postgraduate Student.
    • ,
  • Spiros Zinelis, PhD

      Affiliations

    • Metallurgical Engineer.
    • ,
  • Triantafillos Papadopoulos, DDS, PhD

      Affiliations

    • Associate Professor.
    • Corresponding Author InformationReprint requests to: Dr Triantafillos Papadopoulos, Department of Biomaterials, Dental School, University of Athens, Thivon 2, 115 27 Athens, Greece, Fax: 3102107240633

Department of Biomaterials, Dental School, University of Athens, Athens, Greece

Statement of problem

Porosity is a well-known problem in dental titanium casting, resulting in inferior mechanical properties of dental restorations.

Purpose

The aim of this study was to evaluate the porosity of cpTi castings produced with different casting machines.

Material and methods

Four groups of 20 rectangular (30 × 3 × 0.5 mm) wax patterns were fabricated. Group CyII was cast in a CyclarcII casting machine, Group DAM in a Dor-A-Matic, Group TiF in a Titec 201F, and Group ETi in an EasyTi with cpTi, according to manufacturers' instructions. Groups CyII, DAM and TiF were invested with magnesia based Titavest CB and Group ETi with Ticoat S+L silica based investment. The percentage porosity of each specimen was determined using standardized digital radiographs and calculated by quantitative image analysis procedure. The results were statistically analyzed by nonparametric Kruskal-Wallis test (α=.05).

Results

No statistical differences were found among the groups tested; nevertheless, pore distribution among the specimens of the same group was inhomogeneous. The results show that the casting machines tested produced nonuniform porosity.

Conclusions

Under the conditions of the present study, the type of casting machine does not significantly influence the internal porosity in cpTi castings.

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 Part of this study was presented at the 81st General Session of the IADR, June 2003, Goteborg, Sweden.

PII: S0022-3913(04)00459-7

doi:10.1016/j.prosdent.2004.07.006

Journal of Prosthetic Dentistry
Volume 92, Issue 4 , Pages 377-381, October 2004

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