One of the most important steps in denture making is to take an impression of the tooth and reproduce the shape of the tooth outside the mouth before making a denture. At this point, the precision of the restoration is reflected in the impression material.

The impression step is of course the more accurate the better, because it directly affects the final quality of the restoration. Unfortunately, due to cost and historical reasons, silicone rubber is rarely used in the process of fixing dentures, porcelain crowns, etc. The precision of the restoration can be imagined.

Silicone rubber belongs to polymer synthetic rubber, is an elastic irreversible impression material. In recent years, it has been widely used in the medical field and is one of the most ideal impression materials. Its advantages are mainly shown in the following three aspects:

(1) The size is more stable after solidification, and the size change within 24 hours is stable at about 0.1%;

(2) Short operation time, fast solidification in the mouth, the first impression of 3 minutes for solidification, the second impression of 3 minutes and half;

(3) High precision impression, good operation performance; In addition, the silicone rubber impression material is the same viscosity of rubber components 1:1 mixed use, to the clinical work has brought convenience.