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The effect of a coupling medium on color and translucency of CAD–CAM ceramics

Nogueira, Audrea Dallazem ; Della Bona, Alvaro

Journal of dentistry, 2013-08, Vol.41 (Supplement 3), p.e18-e23 [Periódico revisado por pares]

England: Elsevier Ltd

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  • Título:
    The effect of a coupling medium on color and translucency of CAD–CAM ceramics
  • Autor: Nogueira, Audrea Dallazem ; Della Bona, Alvaro
  • Assuntos: Air ; Algorithms ; Aluminum Silicates - chemistry ; Analysis of variance ; CAD–CAM technology ; Ceramics ; Ceramics - chemistry ; Color ; Colour ; Computer aided design ; Dental Porcelain - chemistry ; Dentistry ; Glycerin ; Glycerol - chemistry ; Heat treatment ; Joining ; Light ; Manufacturers ; Mathematical analysis ; Methods ; Potassium Compounds - chemistry ; Spectrophotometers ; Spectrophotometry ; Spectrophotometry, Ultraviolet - instrumentation ; Studies ; Translucency
  • É parte de: Journal of dentistry, 2013-08, Vol.41 (Supplement 3), p.e18-e23
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    ObjectType-Article-2
    ObjectType-Feature-1
  • Descrição: Abstract Objectives To evaluate color and translucency of ceramics and the influence of a coupling medium (G – glycerin) on these optical properties, testing the hypothesis that glycerin influences the translucency values regardless the evaluation method. Methods Five specimens from A2-shaded ceramics (IPS e.max CAD HT and LT, IPS Empress CAD HT and LT, Paradigm C, and Vita Mark II) were fabricated from ceramic blocks and polished to 1.0 ± 0.01 mm in thickness. A spectrophotometer (Vita Easyshade) was used to measure the CIELAB coordinates and the reflectance value ( Y ) of specimens placed on white and black backgrounds. The translucency parameter (TP) and the contrast ratio (CR) were calculated. Another spectrophotometer (Lambda 20) was used to measure the direct light transmittance ( T %) of the specimens. The color and the CIELAB coordinates were evaluated using the Vita Easyshade on neutral grey background and values were used to calculate difference in color (Δ E ). All evaluations were repeated using G and values were recorded. Data were statistically analyzed using Anova, Tukey and Student's t -test ( α = 0.05) and Pearson's correlation. Results Although the mean translucency values were significantly different for each method (TP and CR), they were strongly correlated ( r2 = 0.97), even when G was used ( r2 = 0.96). Conclusion The coupling medium significantly influenced the mean values of Δ E and translucency. Clinical significance Color and translucency values cannot be compared if measured using different coupling media ( e.g. air and liquid glycerin).
  • Editor: England: Elsevier Ltd
  • Idioma: Inglês;Persa
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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