J Korean Acad Prosthodont.  2009 Jul;47(3):257-265.

The effect of fluoridation on discoloring of bleached teeth

• Jang HA
• Suh KW
• Ryu JJ

Abstract

STATEMENT OF PROBLEM & PURPOSE: To study the effect of different fluoridation methods after in-office bleaching on the color of teeth during severe staining with coffee. MATERIAL AND METHODS: 44 specimens were randomly divided into four groups. Group 1 (no bleaching, no fluoride, coffee) was served as control for the influence of coffee on the color of untreated teeth. Group 2, 3 and 4 were undergone bleaching with 35% H2O2 for 30 minutes a day on 3 consecutive days. Group 2 was remained without fluoridation. Group 3 and 4 were fluoridated for 1 hour with either Cavity shield(R) or pH 7 Gel(R). All of groups were immersed in coffee solution for 7 days. Color determination was accomplished using the spectrophotometer (VITA Easyshade(R)). RESULTS: Delta L and Delta h increased, whereas Delta C decreased in the bleached groups. Pairwise comparisons with Tukey's HSD showed that there were statistically significant differences for Delta L and Delta h between the bleached groups and the non-bleached group (P < .05). Delta L and Delta h decreased continuously, while DeltaC showed an increase after a decrease in all of groups during immersion in coffee solution. After immersion in coffee solution for 7 days there were no statistically significant differences for Delta L, Delta C and Delta h between the groups (P > .05). Also there were no statistically significant differences for Delta L, Delta C and Delta h between the group 3 treated with Cavity shield(R) and the group 4 treated with pH 7 Gel(R) (P > .05). CONCLUSION: It was concluded that fluoridation was not beneficial to the prevention of extrinsic stains after bleaching.

Keyword

bleaching; fluoridation; discoloring; spectrophotometer

MeSH Terms

Coffee
Coloring Agents
Fluoridation
Fluorides
Hydrogen-Ion Concentration
Immersion
Tooth
Coffee
Coloring Agents
Fluorides

Figure

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  Fig. 1. VITA Easyshade® (VITA Zahnfabrik, Bad Sa ¨kingen, Germany).

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  Fig. 2. △L-values during the experiment. Investigation No.1; Baseline, No.2; After bleaching, No.3; Coffee immersion for 1 day, No.4; Coffee immersion for 3 days, No.5; Coffee immersion for 5 days, No.6; Coffee immersion for 7 days.

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  Fig. 3. △C-values during the experiment. Investigation No.1; Baseline, No.2; After bleaching, No.3; Coffee immersion for 1 day, No.4; Coffee immersion for 3 days, No.5; Coffee immersion for 5 days, No.6; Coffee immersion for 7 days.

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  Fig. 4. △h-values during the experiment. Investigation No.1; Baseline, No.2; After bleaching, No.3; Coffee immersion for 1 day, No.4; Coffee immersion for 3 days, No.5; Coffee immersion for 5 days, No.6; Coffee immersion for 7 days.

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