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KMID : 0362420090470030257
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Journal of Korean Academy of Prosthodontics
2009 Volume.47 No. 3 p.257 ~ p.265
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The effect of fluoridation on discoloring of bleached teeth
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Jang Hyang-Ah
Suh Kyu-Won
Ryu Jae-Jun
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Abstract
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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.bGroup 3 and 4 were fluoridated for 1 hour with either Cavity shield® or pH 7 Gel®. All of groups were immersed in coffee solution for 7 days. Color determination was accomplished using the spectrophotometer (VITA Easyshade®).
Results: △L and △h increased, whereas △C decreased in the bleached groups. Pairwise comparisons with Tukey’s HSD showed that there were statistically significant differences for △L and △h between the bleached groups and the non-bleached group (P < .05). △L and △h decreased continuously, while △C 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 △L, △C and △h between the groups (P > .05). Also there were no statistically significant differences for △L, △C and △h between the group 3 treated with Cavity shield® and the group 4 treated with pH 7 Gel® (P > .05).
Conclusion: It was concluded that fluoridation was not beneficial to the prevention of extrinsic
stains after bleaching.
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KEYWORD
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bleaching, fluoridation, discoloring, spectrophotometer
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