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[Comparison among three translucency parameters].

Xiong Fang1, Xia Hui2

  • 1State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, Dept. of Prosthodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China.

Hua Xi Kou Qiang Yi Xue Za Zhi = Huaxi Kouqiang Yixue Zazhi = West China Journal of Stomatology
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Summary

Transmittance (T), translucency parameter (TP), and contrast ratio (CR) in dental materials showed similar variability. While T and TP, and T and CR exhibited exponential relationships, CR and TP did not precisely represent translucency changes.

Keywords:
contrast ratiodental porcelaintranslucency parametertranslucenttransmittance

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Area of Science:

  • Dental Materials Science
  • Optical Properties of Materials
  • Prosthodontics

Background:

  • Accurate assessment of translucency is crucial in dental prosthodontics for achieving aesthetic outcomes.
  • Transmittance (T), contrast ratio (CR), and translucency parameter (TP) are commonly employed metrics to quantify translucency.
  • Understanding the interrelationships and reliability of these parameters is essential for material selection and clinical application.

Purpose of the Study:

  • To compare the commonly used translucency parameters: transmittance (T), contrast ratio (CR), and translucency parameter (TP) in dental porcelain.
  • To investigate the relationships between these parameters and material thickness.
  • To evaluate the reliability and precision of T, CR, and TP in representing translucency variations.

Main Methods:

  • Six Vita enamel and dental porcelain specimens were prepared with initial thickness of 1.2 mm.
  • Specimens were progressively reduced in thickness to 1.0, 0.8, 0.6, 0.4, and 0.2 mm.
  • Transmittance, color parameters, and reflection were measured using a spectrocolorimeter, and T, CR, and TP were calculated and compared.

Main Results:

  • Translucency parameter (TP) increased, while contrast ratio (CR) decreased with decreasing specimen thickness.
  • Transmittance (T) increased with decreasing thickness, showing an exponential relationship.
  • Exponential relationships were observed between T and CR, and between T and TP, with high goodness of fit (0.951 and 0.939, respectively). Coefficient variations (CV) for T, CR, and TP were statistically similar.

Conclusions:

  • Under the tested conditions, transmittance (T), translucency parameter (TP), and contrast ratio (CR) demonstrated comparable coefficients of variation.
  • Exponential relationships exist between T and TP, and between T and CR.
  • Contrast ratio (CR) and translucency parameter (TP) may not precisely represent translucency, particularly when evaluating changing ratios, suggesting transmittance (T) as a potentially more reliable indicator.