This article focuses on different margin configurations and the criteria they must meet to be considered clinically successful. In addition, the use of die spacers to lessen the cement film thickness to achieve a better marginal adaptation of cast restorations is presented. Also, the article presents a step by step method for fitting crowns or retainers in the laboratory and in a clinical setting to make this important procedure less time consuming, more precise, and easy to finalize. Finally, soldering in dentistry and the criteria required for its successful execution are discussed.