title: [Comparison of translucency between enamel, dentin and Vita veneer porcelain].
abstract: OBJECTIVE
  To compare the translucency between enamel, dentin and dental porcelain.
  
  
  METHODS
  32 newly extracted vital human central incisors were collected and cut into 0.8mm enamel slices and 1.0 mm dentin slices. 1.0 mm dental porcelain specimen were made with different Vita veneer porcelain, EN1, EN2, T4, Window, A1, A2, A3, A3.5, A4, B2, C2, D2, 3 samples for each kind. The transmittance and reflectance of tooth slices and porcelain specimen were measured by PR-650 spectra scan spectrocolorimeter. The transmittance coefficients were also calculated. The 95% confidence interval was obtained by SPSS 12.0 software package. SNK method was used to compare the transmittance coefficients of different dentin porcelains.
  
  
  RESULTS
  The transmittance coefficient of tooth enamel ranged from 0.0817 mm(-1) to 0.1009 mm(-1), which was higher than that of two kinds of enamel porcelain (0.0507 mm(-1) for EN1 and 0.0408 mm(-1) for EN2). The transmittance coefficient of dentin (0.0418-0.0482 mm(-1)) was also higher than that of dentin porcelain (0.016-0.027 mm(-1)). The transmittance coefficient of dentin porcelain decreased with the increasing of chroma (P<0.05).
  
  
  CONCLUSIONS
  Prominent difference exists between translucency of tooth tissue and dental porcelain, especially between enamel and enamel porcelain.
authors.affiliation: Department of Dental Technology, West China College of Stomatology, Sichuan University, Chengdu 610041, Sichuan Province, China.
authors.forename: Fang
authors.initials: F
authors.lastname: Xiong
authors.forename: Yong-lie
authors.initials: YL
authors.lastname: Chao
authors.forename: Zhi-min
authors.initials: ZM
authors.lastname: Zhu
mesh_terms: D003722:Dental Alloys; D003743:Dental Enamel; D003776:Dental Porcelain; D003801:Dental Veneers; D003804:Dentin; D006801:Humans
chemical_list: D003722:Dental Alloys; D003776:Dental Porcelain; C047040:Vita VMK 68