J Korean Acad Prosthodont.  2013 Oct;51(4):261-268. 10.4047/jkap.2013.51.4.261.

Effect of different pattern size and pattern shape on castability of commercially pure titanium

• Seo YJ
• Oh GJ
• Lee HI
• Shin YJ
• Kim HJ
• Park SW

• KMID: 2000149
• DOI: http://doi.org/10.4047/jkap.2013.51.4.261

Abstract

PURPOSE
The purpose of this study was to investigate the effect of geometrically different wax pattern shapes and sizes on the castability of Grade2 Cp-Ti (commercially pure titanium).
MATERIALS AND METHODS
Total of 40 mesh wax pattern (61 mm x 24 mm, 207 grids), (61 mm x 17 mm, 138 grids) was cast in this experiment. Depending on the geometrical shape of the wax pattern, 8 groups was organized; Flat, Semicircular, Horse-shoe and V-shape, each consisting 5 samples. Runner-bar sprue was used in all patterns. The number of completely cast grid in wax pattern served as a measure for the castability of comercially pure titanium.
RESULTS
The mean value of square count in each group was as followed; 133.20 squares in group SS (96.52%), 132.40 squares in group SH (95.94%), 132.00 squares in group SF (95.65%), 127.60 squares in SV (91.43%), 198.60 squares in group LF (95.94%), 197.80 squares in group LV (95.56%), 196.40 squares in group LS (94.88%), and 188.00 squares in group LH (90.82%).
CONCLUSION
Within the limitations of this study the results indicate that there were no sttistically significant difference in castability of titanium regarding wax pattern shape (P>.05). However, Small size wax patterns were showing the noticeable castability more than Large size pattern.

Keyword

Titanium; Castability; Wax pattern; Size; Shape; Sprue

MeSH Terms

Titanium*
Titanium

Figure

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  Fig. 1. Schematic represntation of pattern size. A: Small, B: Large.

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  Fig. 2. Stone block indexes used for fabricating wax patterns. A: Semicircular, B: Horse-shoe, C: V-shape.

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  Fig. 3. Wax patterns of each group. A: Flat, B: Semicircular, C: Horse-shoe, D: V-shape.

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  Fig. 4. Preheating schedule of the invested molds.

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  Fig. 5. Titanium castability of shapes and size on the wax pattern.

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  Fig. 6. Sample of casted mesh patterns. A: Small Flat, B: Small Semicircular, C: Small Horse-shoe, D: Small V-shape, E: Large Flat, F: Large Semicircular, G: Large Horse-shoe, H: Large V-shape.

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