Document Detail


Optical influence of the type of illuminant, substrates and thickness of ceramic materials.
MedLine Citation:
PMID:  18602686     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: The present study is an instrumental evaluation of the optical influence of the type of illuminant, substrate and different thickness on the color of dental ceramics. METHODS: Thirty ceramic disks were prepared from IPS-Empress and IPS-Empress2 in three different thicknesses (1.5, 2.0 and 2.5mm). Disks made of composite resin; silver-palladium alloy and gold were used as substrates. The disks with a 1.5mm thickness were placed on a neutral gray photographic paper and measured with a spectrophotometer under three illuminants: daylight (D65), incandescent light (A) and fluorescent light (F6). All ceramic disks were combined with the substrate disks and a spectrophotometer was used to measure the coordinates of lightness (L*) and chromaticity (a* and b*). Two-way ANOVA (p<0.05) was used to analyze the combinations of ceramics, substrates and illuminants tested considering the coordinates of lightness (L*) and chromaticity (a* and b*), and also differences of color (DeltaE), lightness (DeltaL*), chromaticity values (Deltaa* and Deltab*). RESULTS: For the illuminants tested, the results present significant differences for coordinates of chromaticity a* and b*, suggesting a metamerism effect. In combination with the substrates, the results present statistical differences in all the tested conditions, especially where there is no ceramic substructure. SIGNIFICANCE: The presence of discolored tooth remnants or metallic posts and cores can interfere with the desired aesthetic result, based on the selection of color aided by a single luminous source. Thus, the substrate color effect, thickness of the ceramic materials and type of illuminant are important factors to be considered during the clinical application of the ceramic systems.
Authors:
Cláudia Angela Maziero Volpato; Sylvio Monteiro; Mauro Caldeira de Andrada; Márcio Celso Fredel; Carlos Otávio Petter
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Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2008-07-07
Journal Detail:
Title:  Dental materials : official publication of the Academy of Dental Materials     Volume:  25     ISSN:  1879-0097     ISO Abbreviation:  Dent Mater     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2008-12-16     Completed Date:  2009-04-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8508040     Medline TA:  Dent Mater     Country:  England    
Other Details:
Languages:  eng     Pagination:  87-93     Citation Subset:  D    
Affiliation:
Department of Stomatology, Federal University of Santa Catarina, Florianópolis, Santa Catarina, Brazil. claudiamvolpato@hotmail.com
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MeSH Terms
Descriptor/Qualifier:
Aluminum Silicates / chemistry
Ceramics / chemistry*
Color
Colorimetry
Composite Resins / chemistry
Dental Alloys / chemistry
Dental Materials / chemistry*
Dental Porcelain / chemistry*
Gold Alloys / chemistry
Humans
Light
Lighting / classification
Lithium Compounds / chemistry
Materials Testing
Palladium / chemistry
Silver / chemistry
Spectrophotometry
Sunlight
Surface Properties
Chemical
Reg. No./Substance:
0/Aluminum Silicates; 0/Ceramics; 0/Composite Resins; 0/Dental Alloys; 0/Dental Materials; 0/Empress 2; 0/Filtek Supreme; 0/Gold Alloys; 0/IPS-Empress ceramic; 0/Lithium Compounds; 0/lithia disilicate; 12001-21-7/Dental Porcelain; 1302-34-7/leucite; 7440-05-3/Palladium; 7440-22-4/Silver

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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