Kaur, Ravneet
August 2011
Guident;2011, Vol. 4 Issue 9, p69
Academic Journal
Aim of the study: Numerous materials and methods have been used for complete crown fabrication. Conventional investing and casting procedures for phosphate-bonded investments require a 2-4 hours process before completion. Accelerated casting techniques have been tried in this study on single unit castings and marginal gaps were measured and compared with castings made with the conventional casting technique. Materials and methods: The study was conducted in vitro on 50 stone dies duplicated from a brass metal die. On 25, castings were made with conventional casting technique and on other 25 with accelerated casting technique. 2-stage wax elimination cycle was used for conventional group. For accelerated group, the investment mold was heated for 15 min in an oven which was preheated to 8150c. Each casting was seated on its respective stone die and marginal gaps were measured under Traveller's microscope. Marginal gaps were then put for statistical analysis and then evaluated by t-test. Results: The average mean value of conventional group was 500.7um and of accelerated group was 514.2um. No statistically significant difference was found between two groups. Conclusion: All the gap measurements were within the range of clinical acceptability. Therefore, it is concluded from the present study that accelerated casting method is technique sensitive but offers a cost effective and time saving method for fabricating single unit castings.


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