What to consider when selecting impression materials

Depending on the clinical situation, choosing the right impression material is one component in achieving an excellent clinical outcome for the patient. To accurately reproduce a model of the teeth and alveolar ridges, impression materials are used to create a negative mould that is then used to make a cast (copy) of the dentition. A cast may be used for treatment planning, the construction of dentures, crowns or bridges and for orthodontic work. More complex dental work might require the use of impression materials for maxillofacial surgery cases.

There are many types of impression materials to select from, each with their own advantages and disadvantages, and they are chosen on the basis of relative need for accuracy, dimensional stability and elasticity. This article will first provide a brief overview of the role of the dental nurse when using impression materials and then consider the types of dental impression materials available for use. An outline of the disinfection process of impressions will then follow.