[The definitive cementing of fixed prostheses].

The design of the preparations is the main factor of a long lasting retention of crowns and bridges. Unfortunately, cementation is not a gluing but a luting procedure. Among the new permanent cements, glass ionomer which has a low solubility is the most interesting one. The cement exposed at the marginal gap is less prone to be lost. Nevertheless, zinc phosphate, which has a longer working time, remains very popular. Cementation using zinc phosphate is described step by step.