首页 | 本学科首页   官方微博 | 高级检索  
     


Separate contribution of enamel and dentine to overall tooth colour change in tooth bleaching
Authors:Ma Xiao  Li Rong  Sa Yue  Liang Shanshan  Sun Lili  Jiang Tao  Wang Yining
Affiliation:Key Laboratory for Oral Biomedical Engineering, Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, PR China
Abstract:

Objectives

The aim of this study was to evaluate the separate contribution of enamel (E) and dentine (D) to the colour change of tooth which subjected to 10% carbamide peroxide (CP) gels using a novel recombined enamel–dentine (Recombined-ED) study model.

Methods

120 enamel–dentine (ED) samples (four homogeneous premolar ED from each patient; total = 30 × 4 ED) were involved in the present study. Two homogeneous ED samples were bleached with 10% CP and the other two ones were stored in artificial saliva for one, two or four weeks. After treatment, four kinds of layers were prepared from each four homogeneous ED samples by removing enamel or dentine part: bleached-enamel (BE), bleached-dentine (BD), control-enamel (CE) and control-dentine (CD). Initial and final colour records of samples were taken with a spectrophotometer in CIELab system. The contribution of enamel/dentine to the colour change of tooth (CTCC) was calculated by measuring the colour difference ΔE between two different enamel–dentine combinations (ΔE between BE/BD and CE/BD for enamel; ΔE between BE/BD and BE/CD for dentine). Translucency parameter (TP) was obtained by calculating the colour difference between enamel on black and white backings.

Results

ED and recombined-ED were significantly correlated in L*a*b* values both for unbleached samples and bleached samples. Bleaching resulted in a significant colour change (ΔE) of E, D and ED samples. The TP of BE was significantly lower than that of CE. The CTCC of enamel was significantly higher than that of dentine all through the time points.

Conclusions

Enamel played a more important role than dentine in tooth bleaching due to the changes in translucency and colour.
Keywords:Bleaching   Enamel   Dentine   Colour   Contribution
本文献已被 ScienceDirect PubMed 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号