Features: The impression here mainly refers to the oral negative mold obtained by the impression material. Its characteristics depend on the impression material used, such as alginate impression molds are elastic and low cost; silicone rubber impression molds are high in precision and good in stability. The impression surface can clearly present the texture and morphology of teeth, gums and surrounding tissues.
Use: It is the basis for making oral models. According to the impression perfusion model material, a positive mold consistent with the patient's oral structure can be obtained, providing an accurate basis for subsequent denture production, orthodontic design, etc.
