The Colorimetric Study of the Musking Porcelain The Evaluation of the Opacity Using a Hiding Power Index

Translucency is a very important factor for obtaining an esthetic porcelain laminate veneer crown. This translucency is greatly affected by the opacity of the masking porcelain layer, but there is no objective criterion to evaluate the opacity. In general, opacity is well evaluated by hiding power....

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Published inNihon Hotetsu Shika Gakkai Zasshi Vol. 40; no. 3; pp. 459 - 463
Main Authors Satodate, Tamaki, Ishikawa(Nagai), Shigemi, Sawafuji, Futoshi, Endo, Tadaharu, Tatsumi, Hiroteru, Tada, Kenzo, Ishibashi, Kanji
Format Journal Article
LanguageJapanese
English
Published Japan Prosthodontic Society 01.06.1996
Subjects
color
hiding power
musking porcelain
opacity
porcelain laminate veneer crown
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Abstract Translucency is a very important factor for obtaining an esthetic porcelain laminate veneer crown. This translucency is greatly affected by the opacity of the masking porcelain layer, but there is no objective criterion to evaluate the opacity. In general, opacity is well evaluated by hiding power. Therefore, hiding power of masking porcelain was calculated in this study using the ASTM (American Society for Testing and Materials) method. The reflectance value of each masking porcelain sample containing 5, 10, 15, 20, 25, or 30% opacity of pink, white, yellow, and blue were measured with white and black backing, and hiding power was calculated using its scattering coefficients. Hiding power increased in proportion to the opacity and ranged from 100 to 1, 400 for any shade. Color difference dE between white and black backing increased rapidly under the 25% opacity. It was concluded that (1) the opacity could be analyzed as hiding power and (2) hiding power under 20% opacity is very effective on visibility.
AbstractList Translucency is a very important factor for obtaining an esthetic porcelain laminate veneer crown. This translucency is greatly affected by the opacity of the masking porcelain layer, but there is no objective criterion to evaluate the opacity. In general, opacity is well evaluated by hiding power. Therefore, hiding power of masking porcelain was calculated in this study using the ASTM (American Society for Testing and Materials) method. The reflectance value of each masking porcelain sample containing 5, 10, 15, 20, 25, or 30% opacity of pink, white, yellow, and blue were measured with white and black backing, and hiding power was calculated using its scattering coefficients. Hiding power increased in proportion to the opacity and ranged from 100 to 1, 400 for any shade. Color difference dE between white and black backing increased rapidly under the 25% opacity. It was concluded that (1) the opacity could be analyzed as hiding power and (2) hiding power under 20% opacity is very effective on visibility.
Author Sawafuji, Futoshi
Tada, Kenzo
Ishibashi, Kanji
Endo, Tadaharu
Satodate, Tamaki
Tatsumi, Hiroteru
Ishikawa(Nagai), Shigemi
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  fullname: Sawafuji, Futoshi
  organization: Department of Fixed Prosthodontics, School of Dentistry, Iwate Medical University
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  fullname: Endo, Tadaharu
  organization: Department of Fixed Prosthodontics, School of Dentistry, Iwate Medical University
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  fullname: Tatsumi, Hiroteru
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  fullname: Tada, Kenzo
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  fullname: Ishibashi, Kanji
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Snippet Translucency is a very important factor for obtaining an esthetic porcelain laminate veneer crown. This translucency is greatly affected by the opacity of the...
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StartPage 459
SubjectTerms color
hiding power
musking porcelain
opacity
porcelain laminate veneer crown
Subtitle The Evaluation of the Opacity Using a Hiding Power Index
Title The Colorimetric Study of the Musking Porcelain
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