New Products for Technicians » Bredent Casting Technique » Preparation for casting
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Preparation for casting
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Preparation for casting Fig. 1: Linear preheating |
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Preparation for casting Fig. 2: Bar casting When preparing sprues, it must be ensured that the sprues are directed to the melting reservoir via the center or heat. A horizontal bar which is placed in the center of the casting ring serves as a melting reservoir. |
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Preparation for casting Fig. 3: Attaching the rinsing head Correct dimensioning of the sprue/s to be attached and sufficient thickness of the sprue/s and the rinsing heads are essential for homogeneous dental casting and ensure rapid flowing in. |
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Preparation for casting Fig. 4: Casting with sprues If a gold or precious metal bonding alloy is used for casting the framework, the design shown in the pictures is sufficient. Crystallization cooling fins or a second sprue are not required. |
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Preparation for casting Fig. 5: Crown When using NPM alloys for all cast crowns or bridges, sectional investing is recommended to improve the surface of the casting. The same applies to providing crystallization cooling fins – their use eliminates errors of investing or porosities in the casting. |
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Preparation for casting Fig. 6: Bar restorations A correctly wax-up bar structure needs to have suitable sprues to ensure perfect casting. It is essential to obtain rapid and uniform filling of the mould with the alloy. |
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Preparation for casting Fig. 7: CoCr restorations The sprues must be attached in a way to ensure that they are directed to the casting funnel via the center in the investment muffle.. |
