WATER AND SODIUM HYPOCHLORITE INDICATING ENDODONTIC MONITORING DEVICES

摘要

Water and aqueous sodium hypochlorite indicating endodontic monitoring devices include an endodontic cone (20) formed of a water absorptive material (10) and a color changing system applied to the water absorptive material (10) that selectively changes to different colors when exposed to either water or aqueous sodium hypochlorite within a root canal chamber. The water-indicating endodontic cone (20) includes a water absorptive material (10) capable of indicating a change in pH, and a pH insensitive dye. The dye imparts an initial color when the cone (20) is in a dry condition. The pH changing material and pH indicator react in the presence of moisture found in a root canal to yield a second color that differs from the initial color. In the presence of aqueous sodium hypochlorite, the cone (20) changes to a third color different from both the initial color and the second color as a result of bleaching of the dye and/or pH indicator by the hypochlorite ions or aqueous analogs. Color changing cones (20) are manufactured by applying an aqueous solution that includes a pH changing material and dye to a water absorptive cone (20), drying the cone (20), applying an anhydrous pH indicator solution, and then drying the cone (20) again.