Learn the scientific approach to successful and predictable results with C&B investments. Martin Schmid, CDT, covers controllable expansion rates, precise and consistent fits, mixing times, and helpful hints to increase productivity and minimize finishing time. Learn how to avoid porosities and short castings, and review the area of rapid-firing investments. Special attention is given to spruing: direct vs. indirect techniques, the proper use of a runner bar (reservoir) and how to position copings on them. Also covered: how to work with long-span, non-precious bridges and how to cast small bridges with one sprue.