THEORIES OF IMPRESSION MAKING
Channel: DENTISTRY ’N MORE
Date: 17/11/2020

Mucostatic theory (based on Pascal's law) sets out to record the mucosa in its static (supported by underlying basal bone), undisturbed form. This is possible only if the impression material is watery and virtually requires no pressure to place it against tissues. Such an impression will not cover enough area to afford retention, stability and esthetics of a denture.

Mucocompressive theory claims to record the tissues in their functional / supporting form so as to achieve stability in occlusal function. This concept is not very encouraging since it seeks to subject the tissues to a continuous pressure which is conducive to resorptive changes in basal tissues. In addition to this, displaced tissues tend to displace the denture in their attempt to return to their original form.

Last but not the least is the selective pressure theory which is the most widely respected and accepted theory. Here, the idea is to vary the pressure over the denture seat (which is a single unit) depending on the displaceability of the supporting tissues and hence transferring the load over to the selected areas of the seat e.g. buccal shelf area (assuming that it is better suited for the purpose).

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Disclaimer-All the content of the video(Including tables,graphs,pictures, statistics and the description about the topic taken from the reference textbooks available in the public domain(hard and softcopies).

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