More wettability means that the material displaces moisture well and results in fewer voids in the impression. Wettability: how well the material flows into small areas.The chemistry dictates whether a material can work in wet environments. Hydrophilic properties: the ability to tolerate moisture and produce an accurate impression.It is an essential consideration depending on how soon a cast will poured. Some materials have a longer time, with a poured cast remaining accurate up to two weeks, whereas others last just two hours or less. Dimensional stability: how long the material maintains accuracy after an impression is taken.Dimensional accuracy: how closely the impression material reproduces the details of the patient’s mouth.Impression materials are often subject to the following criteria 1: “It’s a matter of preference for most clinicians.”Ĭharacteristics of Impression Materials Comparing the attributes of materials is helpful when choosing one for a given case. “There are so many great impression materials,” Dr. And honestly, clinically, materials have gotten so good that there is not much difference.”Įach type has its pros and cons - situations where the material provides excellent performance and others that leave less than optimal results.
“Clinicians fall into either camp: They are either a VPS clinician or a polyether clinician. “Most of the impression materials in use today are VPS or polyethers,” says Sam Simos, DDS, a dentist in private practice in Ottawa, Illinois, and a national lecturer in cosmetic and restorative dentistry. The most recent addition, which joined the group about 10 years ago, is vinyl polyether siloxane (VPES), a hybrid of PE and VPS that exhibits qualities of each. The most common types have been used since the middle of the 20th century and include alginates, polyethers (PEs) and vinyl polysiloxane (VPS). Today’s market contains a plethora of choices of impression materials. Moreover, the materials should remain dimensionally stable so the technician can pour multiple casts. Lab technicians expect it to retain dimensional accuracy when disinfected.
Produces an accurate impression by adapting in great detail to the patient’s teeth and gums.
The ideal material has all the following characteristics: In other words, the impression materials you choose could make it or break it for you - sometimes literally.ĭental professionals have high expectations for impression materials. When it comes to conventional impressions, good ones start, at least in part, with excellent materials. Making a good impression is essential to the success of your indirect restorations.
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