Minimal Time for Gingival Retraction Cords to Achieve Accurate Impression: An In Vivo Study

The introduction of elastomeric impression materials in dentistry resulted in the development of different methods of tissue retraction in order to achieve accurate impression of the finish line of the tooth preparation, which is necessary to fabricate a prosthetic crown. This area needs to be clean, dry and visible. The gingival retraction method [1] is conducted using a retraction cord soaked in epinephrine or in an astringent agent. In addition to retracting the tissues laterally to permit impression taking of the tooth preparation finish line, the use of a retractor cord promotes a dry, clean gingival crevice, eliminating blood and/or gingival crevicular fluid.