| 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 the 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 tooth ( 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 tooth ( 20 ). The dam ( 24; 124; 224 ) is formed to accommodate either the posterior teeth or the anterior teeth. The dam has retainers ( 125 A, 125 B; 225 A, 225 B) formed therein for aiding in holding the silicone impression material.
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