Before making a denture, an impression of the tooth is made and the shape of the tooth is reproduced outside the mouth. This is one of the most important steps in denture making. At this point, the precision of the restoration is reflected in the impression material.

Of course, the more accurate the impression is, 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 making fixed dentures, porcelain crowns, etc. The precision of the prosthesis can be imagined.

It is strongly recommended that zirconia and other high-end prostheses should be molded with silicone rubber to ensure the quality of the prosthesis and improve patient satisfaction.

1. silicone rubber die material overview

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

(1) After solidification, the size is more stable, and the size change within 24 hours is stable at about 0.1%;
(2) The operation time is short and the solidification in the mouth is fast. The first impression solidifies in 3 minutes and the second impression solidifies in 3 and a half minutes.
(3) high accuracy of impression and good operation performance; In addition, the molded silicone rubber impression material is a 1:1 mixture of rubber components with the same viscosity, which brings convenience to clinical work.