Objective: To compare the performance of a standardized photographic shade analysis (PSA) and visual shade matching (VSM) using two color difference formulas.
Materials And Methods: Fifty observers (35 undergraduate and 15 graduate students) evaluated the color of two upper left central incisors (LT-light tooth, and DT-dark tooth). VSM was performed using the VITA 3D Master (3D) shade guide in a controlled clinical environment. For PSA, a cross-polarized filter and a gray card (Whibal) were used to standardize the photographs taken (target teeth and shade tabs from 3D). From the pictures obtained, the CIELAB coordinates, and color differences ( and ΔE ) were obtained. The shade tabs selected by two experienced researchers were conducted as part of the pilot study, and finally used as a standard for the analysis. Data were analyzed using descriptive statistics and the chi-square test (p ≤ 0.05).
Results: Shade tabs selections of VSM and PSA agreed only for LT. The best "Match" selected by the researchers agreed with data from PSA using ΔE . PSA using ΔE showed higher total percentages of "Match" and higher percentage of agreement among observers. A relationship was found for LT performing the PSA (p < 0.05).
Conclusions: The performance of the PSA was better than the VSM, but only when the CIEDE2000 color difference formula was used. Therefore, the color difference formulas influenced on the performance of PSA. Finally, the PSA improved the precision of the VSM.
Clinical Significance: To use a standardized PSA to improve the VSM and shade communication in clinical esthetic dentistry.
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http://dx.doi.org/10.1111/jerd.12883 | DOI Listing |
J Clin Exp Dent
December 2024
D.D.S., M.S., Ph.D. Clinical Associate Professor. Department of Restorative Dental Sciences, University of Florida, College of Dentistry, 1395 Center Drive, College of Dentistry, Gainesville, FL, United States.
Background: The aim of this study was to evaluate the 50%:50% perceptibility thresholds (PT) and acceptability thresholds (AT) for color differences in ceramic shade tabs observed by dentists and patients using CIEDE2000 color difference formula.
Material And Methods: Twenty-two combinations of ceramic shade tabs from the VITA 3D Master shade guide were assembled to be used for the visual comparison analyses. The color difference between each shade tab pair was numerically determined by spectrophotometry using the VITA EasyShade V, and calculated using the CIEDE2000 formula (ΔE00).
Purpose: The study aims to produce CAD-CAM reference samples for shade communication milled from the material of the restoration zirconia (ZrO2) and zirconia-reinforced lithium silicate (ZLS) and evaluate the color difference with the corresponding conventional Vita Classical (VC) shade tab. Furthermore, it aims to verify the color consistency of the materials.
Materials And Methods: Five-five samples were milled out of ZrO2 and ZLS in five different colors and their color parameters were compared with the corresponding VC tabs both visually and digitally.
J Esthet Restor Dent
December 2024
John M. Powers Ph.D., Center for Biomaterials and Biomimetics (PCBB), UTHealth Houston School of Dentistry, Houston, USA.
Objective: To provide guidelines and means for optimal coverage and distribution of computer models with 1-10 clusters, designed based on an in vivo extensive dental colorimetric database and compare the findings with some reputable shade guides.
Materials And Methods: The Fuzzy C-Means (FCM) algorithm was used to optimize the tab position in the CIELAB color space, while MATLAB Fuzzy Logic was used to implement the codes. A minimization process was performed to fine-tune the cluster centers, minimizing Coverage Error (CE) and Maximum Error (ME).
Background: Gingival aesthetics or pink aesthetics requires a prosthodontic approach to ensure an appealing smile with an optimal muco-gingival appearance by the use of colored materials with gingival shades to match adjacent soft tissues. However, the selection of this adhesive gingival-colored material becomes complex owing to the wide range of gingival color guides and shade tabs currently available on the market.
Aim: The study aims to assess the variation in gingival color between two specific regions on the anterior gingival surface through the use of a digital color assessment method.
J Esthet Restor Dent
September 2024
Department of Preventive and Restorative Dentistry, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
Objective: New shade-matching devices are available for clinical use, but their accuracy and reliability have not been investigated. This in vitro study compared the accuracy and reliability of a shade-matching colorimeter (Optishade), a spectrophotometer (VITA Easyshade V), and visual shade matching in simulated clinical conditions.
Material And Methods: Shade matching was conducted with two digital devices; (Optishade and Vita Easyshade) and the visual shade selection method, with a new 16-tab Vita Classical shade guide.
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