Abstract
Objective: To determine the effect of sprue design on the marginal accuracy of the casting. Material and Methods: It was an experimental in-vitro study. There are forty-four crowns of single sprue group with a forty-four double sprue group that was compared in 6 different locations of the margin. The sections were inspected under a microscope at 50X magnification and took a micrograph. The radius from an actual casting edge to a possibly excellent margin was then documented as marginal discrepancy (d), in µm. The marginal discrepancy was documented for each of the six sections per casting. Thus 264 sections were measured for each group. Data were analysed using (ANOVA) for analysis of variance. For bivariate analyses, Chi-square and Student t test were used. The significance level was set at < 0.05. Results: The marginal discrepancy was greater in the single sprue group of cast crown (43.1 ± 4.74 µm) and in double sprue group of cast crown was less (25.7 ± 4.25 µm). This difference is statistically significant (p<0.05). The correlation between single sprue group of casting with a double sprue group of casting by student’s t-test where determination height was 95%. Conclusion: Double sprue design produces a higher accurate margin than single sprue design in the nickel-chromium alloy cast crown.
Highlights
Casting of an alloy was one of the critical factors associated with the success of the metal restoration.Castability of an alloy faithfully reproduces the sharp detail and fine margins of the wax pattern
There are forty-four crowns of single sprue group with a forty-four double sprue group that was compared in 6 different locations of the margin
The results of this study show that marginal discrepancy was greater in single sprueing group of cast crown where mean 43.1 ± 4.74 μm and in double sprueing group of cast crown was less where mean 25.7 ± 4.25 μm
Summary
Castability of an alloy faithfully reproduces the sharp detail and fine margins of the wax pattern. Castability of dental alloy was affected by alloy selection, pattern design, sprue technique, investment material, wax elimination procedures and melting temperature and casting procedures [2]. It was important related cast crown fabrication dimensional accuracy. A perfect margin is one of criteria of a dimensionally accurate crown. Proper sprue design makes perfect casting in all dimensions [3]. The dimensionally accurate crown must be fitted with the prepared teeth since the castability of alloy influence directly [4]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Pesquisa Brasileira em Odontopediatria e Clínica Integrada
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
