Function of an Impression:
An impression represents the negative image of a patient's mouth. The dental laboratory uses this mold to create a positive cast (or stone model) of the patient's tooth structure. This cast allows the dental laboratory to make a crown, bridge or other prosthetic device outside of a patient's mouth. The impression and stone cast must be extremely accurate in duplicating the teeth and soft tissues. If the impression and stone cast are not accurate, the restoration made by the dental laboratory may not fit and a costly remake may be required.

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