Journal of Korean Academy of Oral Health

The Korean Academy of Preventive Dentistry and Oral Health (대한예방치과·구강보건학회)
권호 표지

Inhibition of post-bleach stain by dentifrice containing nano-carbonate apatite

전문가 미백 처치 후 나노 탄산 아파타이트 함유 치약에 의한 재 착색 방지 효과

Kang, Si-Mook;Kim, Hee-Eun;Kwon, Ho-Keun;Kim, Baek-Il
강시묵;김희은;권호근;김백일

  • Published : 2008.03.01
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Abstract

Objectives: The aims of this study were to evaluate inhibition effects of nano-carbonate apatite (n-CAP) dentifrice for post-bleach staining and to compare efficacy of color measurement betweenspectrophotometer and digital image analysis.Methods: The enamel specimens were bleached with a 35% Hydrogen peroxide gel. The compositionsof experimental dentifrice were as follows: 0%, 5% and 20% n-CAp and commercial nano-hydroxyapatite dentifrice. The bleached specimens were treated for 24 hours with dentifrice slurries.The treated specimens were stained in an extrinsic staining solution composed ofTSB broth, containingSarcina tutea, for a 72 hours. The color changes in each specimen were measured before and afterextrinsic stains using a spectrophotometer and a digital camera. After taking a digital image using acamera, Casmatch stickers were used to evaluate the in change whiteness with a correction for eachimage.Results: Extrinsic staining showed much stronger stain relapse in the group treated without n-CAp thanin those treated with the 5 and 20% n-CAp solution, which maintained a glossy appearance. Afterextrinsic staining over a 72 hour period, digital image analysis showed that the control group had anapproximately 68% lower gray value, while the n-CAp groups showed an approximate 75% decrease.In both cases, a 5 and 20% concentration, the efficacy of stain inhibition was similar (P<0.05).Spectrophotometric analysis showed that the control and hydroxyapatite group were decreased E valueabout 80%, while the n-CAp groups were decreased about 83 and 86% respectively low and highconcentration, because it was quits difficult to focus on a precise R.01 on the specimen.Conclusion: The dentifrice containing nano-carbonate apatite effectively inhibits extrinsic stain after in-office bleaching by hydrogen peroxide. Moreover, the digital image analysis is the simple and powerfulmethod for color measurement better than spectrophotometer.

Keywords

References

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