| 摘要 |
A method and a device for effecting the cordless retraction of the gingival sulcus tissue (21) prior to the taking of an impression of a tooth (20) for making a crown or bridge which is attained by controlling any bleeding in th e gingival sulcus area (21), and utilizing a dental dam (24; 124; 224) preferably formed of a sponge or foam like material to contain an astringent fortified silicone impression material (26) embedded about the prepared toot h (20), and using the patient's biting force to apply the necessary pressure onto the dam until the silicone impression material (26) sets and adheres to the dam to enhance easy removal of the set impression material from the toot h (20). The dam (24; 124; 224) is formed to accommodate either the posterior teeth or the anterior teeth. The dam has retainers (125A, 125B; 225A, 225B) formed therein for aiding in holding the silicone impression material.</SDOA B>
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