Chinese Journal of Tissue Engineering Research ›› 2012, Vol. 16 ›› Issue (34): 6377-6381.doi: 10.3969/j.issn.2095-4344.2012.34.022

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Chroma values of maxillary central incisors in Guizhou residents with dental fluorosis

Liao Jian1,2, Wang Yong2, Teng Min-hua1, Zhai Jun-jiang1, Liang Xing1   

  1. 1Department of Prosthodontics, West China College of Stomatology, Sichuan University, Chengdu 610041, Sichuan Province, China;
    2Department of Prosthodontics, Affiliated Hospital of Guiyang Medical University, Guiyang 550004, Guizhou Province, China
  • Received:2012-04-05 Revised:2012-05-12 Online:2012-08-19 Published:2012-08-19
  • Contact: Liang Xing, Doctor, Professor, Doctoral supervisor, Department of Prosthodontics, West China College of Stomatology, Sichuan University, Chengdu 610041, Sichuan Province, China xingliangdent@ vip.163.com
  • About author:Liao Jian☆, Studying for doctorate, Lecturer, Attending physician, Department of Prosthodontics, West China College of Stomatology, Sichuan University, Chengdu 610041, Sichuan Province, China; Department of Prosthodontics, Affiliated Hospital of Guiyang Medical University, Guiyang 550004, Guizhou Province, China dentistliaojian@ yahoo.cn

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Abstract:

BACKGROUND: In shade matching of ceramic restoration, the color range of Vitapan classic shade guide and Vitapan 3D-Master shade guide both cannot cover all that of natural teeth，and cover even less the color space of dental fluorosis teeth.
OBJECTIVE: To analyze the characteristics and distribution of dental fluorosis chroma value and to further compare the differences of chroma values between dental fluorosis and normal teeth from Guizhou residents.
METHODS: A total of 317 dental fluorosis patients with 634 maxillary central incisors were randomly selected as experimental group, and 204 healthy normal people with 408 maxillary central incisors were randomly selected as control group. The tooth color was measured by a computer-aided Shade-Eye NCC colorimeter, and expressed in terms of three coordinate values (L*, a*, b*) of the CIE-1976-Lab color system recommended by International Commission on Illumination.
RESULTS AND CONCLUSION: The chroma value of maxillary central incisors in the experimental group (dental fluorosis) was wider than that in the control group (normal teeth) and the L* value in the experimental group was significantly lower than that in the control group (P < 0.05), while the a* value and b* value in the experimental group were both obviously higher than those in the control group (P < 0.05). As for dental fluorosis, the L* value in cervical Ⅱ region was the highest among nine regions, and that in incisal Ⅸ region was the lowest. The L* value showed a diminishing trend from cervical, central region to incisal region. While a* value and b* value in the mesial 1/3 region of teeth lips face were both higher than those in the distal 1/3 region. There was no significant difference was in the chroma values of maxillary incisors between the left and the right for the same subject (P > 0.05). These results suggest that compared with normal teeth, the chroma-value distribution of dental fluorosis is more dispersive and wider, besides, the corresponding color is dark, redder and yellower.

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