Improvements in a method of and a retraction cord for uncovering

Details Improvements in a method of and a retraction cord for uncovering Improvements in a method of and a retraction cord for uncovering

1987-11-25

1989-10-03

Wilson, John J.

Dentistry

Apparatus

Having absorption means or means to isolate tooth or mouth...

433215, A61C 514

Patent

active

048713112

ABSTRACT:
A retraction cord is provided for use in uncovering and draining the preparation limit line of a tooth where the tooth emerges from gum tissue which is subject to bleeding during the course of conducting a procedure such as the taking of a dental impression, the cementing of a crown and the performance of conservative caries therapy. Practicing the method includes inserting said cord in a gingival crevice extending perimetrically of a tooth having a preparation limit line, where the tooth emerges from gum tissue, between the tooth and the gum tissue, and permitting the cord to absorb moisture so that the cord swells and thereby mechanically uncovers said preparation limit line and mechanically compresses said gum tissue, tending to stop bleeding of such gum tissue. The preferred material for making the cord is a superabsorbent swelling material made of an acrylic fiber having a skin constituted by a copolymer of polyacrylic acid and polyammonium acrylate and a core of polyacrylonitrile, in which the skin provides about thirty percent of the weight of the fiber.

REFERENCES:
patent: 4321038 (1982-03-01), Porteous
patent: 4366206 (1982-12-01), Tanaka
patent: 4465462 (1984-08-01), Ticknor
patent: 4609584 (1986-09-01), Cutler et al.
patent: 4650479 (1987-03-01), Insley

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