Impression (Dental)
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A dental impression may be described as an accurate representation of part or all of a person's dentition. It forms a "negative" of a person's teeth which can then be used to make a model (physical) of the dentition. This may be used for the fabrication of dentures, crowns or other prostheses.
An impression is carried out by placing a liquid material into the mouth in a customised tray. The material then sets to become an elastic solid, and when removed from the mouth retains the shape of the teeth.
Common materials used for dental impressions are sodium alginate, agar and silicones, both condensation-cured silicones and addition-cured silicones.zh-min-nan:Kā-bô·
