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The use of digital imaging for colour matching and communication in restorative dentistry.
Br Dent J. 2005 Jul 09; 199(1):43-9; discussion 33.BD

Abstract

OBJECTIVE

To develop a shade matching method based on digital imaging and to compare observers' ability using this method with the conventional one set against a spectrophotometric 'gold standard'.

METHODS

Two Vita Lumin shade guides were used in this study, nine shades being selected from the first Vita Lumin shade guide, A2, A3, A3.5, B2, B3, B4, C1, C2 and C3. A second shade guide was used to match the selected shades. A Nikon Coolpix 990 digital camera with Nikon SB21B ring flash was used to record the digital images of the shade tabs of the two shade guides and the images were processed using Adobe Photoshop software. A total of 27 samples (three replicates of each shade of the nine tabs selected) were matched with a digital shade guide prepared from the digital images of the second shade guide by 10 observers on a computer screen (computerised matching method). The 10 observers also matched the same shade tabs using the conventional matching method simulated in a phantom head. In addition, colour values were obtained from the digital images using Adobe Photoshop and quantified according to an internationally recognised scale as CIELAB colour values, L*,a*,b*. The relationship of the digitally derived CIELAB values to the CIELAB values obtained using a reflectance spectrophotometer was investigated.

RESULTS

The cross tabulation statistical analysis showed a statistically significant difference (p<0.001) between the conventional method and the computer method with a 43% and 61.1% correct match respectively. There was also a statistically significant difference between observers in both methods (p<0.001 and p<0.04 for the conventional and computer methods respectively). A statistically significant high correlation of the CIELAB colour values were found between both colour measurement methods (p<0.001).

CONCLUSION

The observers' shade matching performance was significantly better with the computer method compared with the conventional one. There was a large variation in the observers' matching ability. The digital camera can be used as a means of colour measurements in the dental clinic.

Authors+Show Affiliations

Jarad FD
Liverpool University Dental Hospital, Pembroke Place, Liverpool, L3 5PS. f.jarad@liverpool.ac.uk
Russell MD
No affiliation info available
Moss BW
No affiliation info available

MeSH

ColorColorimetryCommunicationComputer SystemsCross-Over StudiesDental PorcelainDental Prosthesis DesignDental Restoration, PermanentHumansImage Processing, Computer-AssistedModels, DentalObserver VariationPhotographyProsthesis ColoringSoftwareSpectrophotometry

Pub Type(s)

Clinical Trial
Comparative Study
Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

16003426

Citation

Jarad, F D., et al. "The Use of Digital Imaging for Colour Matching and Communication in Restorative Dentistry." British Dental Journal, vol. 199, no. 1, 2005, pp. 43-9; discussion 33.
Jarad FD, Russell MD, Moss BW. The use of digital imaging for colour matching and communication in restorative dentistry. Br Dent J. 2005;199(1):43-9; discussion 33.
Jarad, F. D., Russell, M. D., & Moss, B. W. (2005). The use of digital imaging for colour matching and communication in restorative dentistry. British Dental Journal, 199(1), 43-9; discussion 33.
Jarad FD, Russell MD, Moss BW. The Use of Digital Imaging for Colour Matching and Communication in Restorative Dentistry. Br Dent J. 2005 Jul 9;199(1):43-9; discussion 33. PubMed PMID: 16003426.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The use of digital imaging for colour matching and communication in restorative dentistry. AU - Jarad,F D, AU - Russell,M D, AU - Moss,B W, PY - 2002/12/08/received PY - 2003/11/14/accepted PY - 2005/7/9/pubmed PY - 2005/8/12/medline PY - 2005/7/9/entrez SP - 43-9; discussion 33 JF - British dental journal JO - Br Dent J VL - 199 IS - 1 N2 - OBJECTIVE: To develop a shade matching method based on digital imaging and to compare observers' ability using this method with the conventional one set against a spectrophotometric 'gold standard'. METHODS: Two Vita Lumin shade guides were used in this study, nine shades being selected from the first Vita Lumin shade guide, A2, A3, A3.5, B2, B3, B4, C1, C2 and C3. A second shade guide was used to match the selected shades. A Nikon Coolpix 990 digital camera with Nikon SB21B ring flash was used to record the digital images of the shade tabs of the two shade guides and the images were processed using Adobe Photoshop software. A total of 27 samples (three replicates of each shade of the nine tabs selected) were matched with a digital shade guide prepared from the digital images of the second shade guide by 10 observers on a computer screen (computerised matching method). The 10 observers also matched the same shade tabs using the conventional matching method simulated in a phantom head. In addition, colour values were obtained from the digital images using Adobe Photoshop and quantified according to an internationally recognised scale as CIELAB colour values, L*,a*,b*. The relationship of the digitally derived CIELAB values to the CIELAB values obtained using a reflectance spectrophotometer was investigated. RESULTS: The cross tabulation statistical analysis showed a statistically significant difference (p<0.001) between the conventional method and the computer method with a 43% and 61.1% correct match respectively. There was also a statistically significant difference between observers in both methods (p<0.001 and p<0.04 for the conventional and computer methods respectively). A statistically significant high correlation of the CIELAB colour values were found between both colour measurement methods (p<0.001). CONCLUSION: The observers' shade matching performance was significantly better with the computer method compared with the conventional one. There was a large variation in the observers' matching ability. The digital camera can be used as a means of colour measurements in the dental clinic. SN - 0007-0610 UR - https://www.unboundmedicine.com/medline/citation/16003426/The_use_of_digital_imaging_for_colour_matching_and_communication_in_restorative_dentistry_ DB - PRIME DP - Unbound Medicine ER -