Document Detail

Influence of particle size distribution of dental opacifier on the colour of titanium opaque porcelain.
MedLine Citation:
PMID:  21771632     Owner:  NLM     Status:  Publisher    
OBJECTIVE: To investigate the effect of particle size distribution of opacifier tin dioxides (SnO(2)) on the colour of dental opaque porcelain for pure titanium by spectrophotometer. METHODS: Sixteen groups of opaque porcelain powders were prepared by combining four grain size SnO(2) with four pigments (no pigment, yellow, coral pink and grey). Five porcelain discs (13mm diameter and 2mm thickness) for each powder were fired. K/S ratios and L*a*b* values of specimens were obtained by a spectrophotometer. The maximum colour differences (ΔE(max)) caused by grain size of SnO(2) in each pigment group were determined using the CIELAB and the CIEDE2000 formulas. The L*a*b* values in each pigment group were compared by MANOVA and the ΔE(max) of different pigment groups were subjected to one way ANOVA. RESULTS: With SnO(2) grain size increasing, the L* values decreased, and both a* and b* became more chromatic consistently in each pigment group (p<0.001). The ΔE(max) in all pigmented groups were above the 50:50% perceptibility thresholds, with ΔE(max) in yellow group greater than the acceptability thresholds. Significant difference was found in the ΔE(max) of four pigment groups regardless of the colour formula (p<0.001). CONCLUSIONS: 15wt% SnO(2) with median particle size ranging from 0.85 to 20.75μm caused significantly perceptible colour differences in the pigmented titanium opaque porcelains used in this study.
Xingxing Li; Pei Zhang; Jianfeng Yang; Tianwen Guo
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-7-13
Journal Detail:
Title:  Journal of dentistry     Volume:  -     ISSN:  1879-176X     ISO Abbreviation:  -     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-7-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0354422     Medline TA:  J Dent     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011. Published by Elsevier Ltd.
Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, Xi'an, China; Department of Prosthodontics, School of Stomatology, Kunming Medical College, Kunming, China.
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