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Classification of impression materials is the most frequently asked question for exams.

We need to understand which impression material and technique are used in an individual.

For instance, elderly with resorbed ridges, it is difficult to get retention in dentures. So, we use mostly admixed technique with resorbed ridges. Individual with deep undercuts, the material of choice for recording impression is alginate with perforated stock trays.

Impressions are the Key for a good prosthesis. It is very important for us to understand taking a good impression using a correct impression technique.

Dentist must know the impression materials used for specific condition.

Prosthesis fabrication starts with an impression. An impression is imprint of the mouth. As we say, first impression should be good,likewise a dental impression recorded should cover all minute details of the mouth.

Impression is a negative replica of a mouth, same as film for a picture.

watch our you tube video on dental pathshala to understand the classification of impression materials.

Classification of Impression materials

Based on the degree of tissue Compression or the amount of pressure applied on the tissues. Impression techniques can be broadly classified into Muco static, Muco compressive, and selective pressure technique.

Mucostatic Impression technique

As the name signifies Muco static means no pressure is applied On the tissues while taking Impression. Since no pressure is applied, Tissue health is preserved.Hence, it is also known as Minimal pressure technique. This technique was given by henry Page.A very good example of mucostatic technique can be Impression plaster. But retention is not good for mucostatic impression technique.

Mucocompressive Impression technique

As per the name it imparts compression forces on mucosa.Hence, it is also known as Definite pressure impression.Since,it is applying compression forus to oral tissues,this technique ,has good retention While chewing.Material of Choice for Mucocompressive impressiontechnique includes Impression compound,Soft liners.

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