11 | 合法醫療器材資訊網

2015年1月1日—Impressionmaterialsareloadedintotraysintheirinitiallowviscousform(withtheexceptionofimpressioncompound)andthenplacedinthe ...

Impressions are used in the dental surgery to produce accurate (varying degrees of accuracy) negative reproductions of the patients’ teeth, surrounding tissues and dental arches. Casts (positive reproductions) are created from dental impressions and are used to fabricate various dental prostheses. Different types of impression materials are available. Technique, accuracy, taste, ease of manipulation, cost, dimensional stability and the operator’s preference will dictate the choice of impression materials (Figure 11.1[1]).

Figure 11.1[2] Impression material classification (elastic properties).

Impression materials are loaded into trays in their initial low viscous form (with the exception of impression compound) and then placed in the patient’s mouth. The impression material will set chemically or physically and then may be ...