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Quintessence Publishing: Journals: QI
Quintessence International

Edited by Eli Eliav

ISSN 0033-6572 (print) • ISSN 1936-7163 (online)

Publication:
February 2007
Volume 38 , Issue 2

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Effect of sprue design on the castability and internal porosity in pure titanium castings

Satyabodh S. Guttal, MDS, MFPT (UK) / Narendra P. Patil, MDS

PMID: 17510717

Objective: The aim of the study was to evaluate the pure titanium castability and internal porosity with 3 different sprue designs. Method and Materials: The sprue designs selected were the conventional cylindrical, funnel-shaped, and sheet-form sprue formers. To evaluate the castability, the mesh monitor was chosen. Eight mesh patterns (14 3 14 mm) of 49 squares were attached to each type of sprue design. They were invested in titanium investment material and cast in a semiautomatic titanium casting machine. The titanium castings were evaluated by 2 methods. One was the visual observation of the castings for completeness, and the second was the radiographic qualitative analysis for the location of the internal porosities. Results: Data were analyzed with analysis of variance and Student t test for paired comparison among different sprue designs. According to analysis of variance, all sprue designs revealed a statistically significant difference at the 5% level of confidence (P < .05, F = 3.50). Mesh patterns attached to funnel-shaped sprue designs showed better percentage castability values. Conclusion: For titanium, casting using a funnel-shaped sprue design displayed better castability values and less internal porosities in the castings. (Quintessence Int 2007;38:89.e7882)

Key words: dental casting, porosity, sprue design, titanium castability

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