GINGIVAL COLOR WITH IMPLANT-SUPPORTED FIXED PROSTHESES (ISFP) AND THE IMPACT ON ESTHETIC OUTCOMES.

Objectives: To: 1) analyze possible differences in the CIEDE2000 lightness, chroma and hue of the gingiva at the free gingival margin (FGM) and the middle zone of keratinized gingiva (MZ) between participants with an ISFP in the maxillary anterior region and participants with natural dentition and healthy gums; and 2) examine the perceptibility/acceptability of the differences in CIEDE2000 lightness, chroma and hue and in overall color, using the Euclidean and CIEDE2000 formulae.

Methods: The L*, a* and b* color coordinates were measured in 60 adult participants (30 with an ISFP and 30 with healthy teeth and gums) using a Spectroshade™ Micro spectrophotometer. From these coordinates, the changes in lightness (ΔL'), chroma (ΔC') and hue (ΔH') CIEDE2000 between the participants with and without an ISFP were quantified.

Coverage error and shade-match accuracy in three ceramic gingival systems.

Statement Of Problem: Research into the coverage error (CE) of gingival systems that have been expanded by using ceramic specimens created by mixing basic colors is lacking.

Purpose: The purpose of this in vitro study was to compare the CEs of 3 ceramic gingival color systems that have been expanded with basic-color mixtures from a sample of 360 White participants and to classify the participants according to the accuracy of the shade match achieved with each system.

Material And Methods: L*a*b* color coordinates were recorded in 3 zones of attached gingiva for 360 White participants with healthy gingival tissue (187 men and 173 women).

Fifteen ceramic gingival samples: A proposed gingival shade guide.

Objective: (1) To put forward a set of valid pink ceramic samples for subjective gingival colour selection in the Caucasian population, and (2) to assess the quality of the shade matches provided by the selected pink samples.

Methods: The ceramic gingival shade samples (n = 133) were obtained by mixing pairs of basic colours from a single system. In each mixture, the proportions of the colours were altered in 10% increments, following the numerical order used by the manufacturers of the three colour systems under study (Heraceram, Vita VM9 and IPS Style).

Burnout syndrome in dentists: Work-related factors.

Objective: To study the sociodemographic and work-related factors that affect the level of burnout syndrome in Spanish dentists through an observational epidemiological study.

Method: An online survey answered by 1298 Spanish dentists was used to record their gender, age, work environment, number of practices in which they work, whether they work alone or not, whether they own or co-own the practice, years of experience, working hours per week, and their answers to the Maslach Burnout Inventory (MBI-HSS). A univariate analysis was carried out to study the relationship between the work-related and sociodemographic factors examined for each of the three dimensions of burnout: Emotional Exhaustion (EE), Depersonalisation (DP) and Personal Accomplishment (PA).

Dental student, dentist, dental assistant, and layperson perception of pink gingival porcelain color.

Statement Of Problem: How pink gingival porcelain color is perceived by participants classified according to profession and sex is unclear.

Purpose: The purpose of this in vitro study was to evaluate the degree of correlation between the ordering of color tabs by participants classified according to profession, years of dental work experience, and sex and the ideal chromatic order based on the color coordinate L∗ (lightness).

Material And Methods: Twenty-one colored specimens made of Heraceram pink gingival porcelain were used.

Colour thresholds of the gingival chromatic space.

Objective: To establish the thresholds of chromatic perception and clinical acceptability of gingival colour according to professional category and in accordance with the perceptibility/acceptability threshold of 50:50 (colour differences that can be perceived/accepted by 50 % of the observers).

Methods: A total of 21 different coloured samples made of pink gingiva Heraceram porcelain were used. Dentists (n = 54), dental assistants (n = 56), dental students (n = 126) and participants unrelated to dentistry (n = 116) were asked to identify pairs of samples that appeared identical.

Comparison of two color-difference formulas using the Bland-Altman approach based on natural tooth color space.

Statement Of Problem: Several formulas to measure color differences have been proposed to improve the correlation between color measurements and visual perception. Despite the progress obtained, equating between formulas is complex, rendering the exchange of information in scientific papers difficult.

Purpose: The purpose of this study was to determine the relationship between the results provided by classic CIELab (ΔEab∗) and the CIEDE2000 (ΔE00) formulas in the natural tooth color space using the Bland and Altman limits of agreement, to use this relationship to establish the equivalences between the tooth color thresholds of acceptability and perceptibility of both formulas, and to evaluate whether the relationship between ΔEab∗ and ΔE00 is modified depending on the axis on which the changes occur.

Comparison of the CIELab and CIEDE2000 color difference formulas.

Statement Of Problem: Many color specification systems and color differences have been proposed to improve the correlation between color measurement and visual perception. Although color differences can be quantified using either the CIELab formula (ΔE*(ab)) or the recently introduced CIEDE2000 formula (ΔE00), which captures the perceived color difference better is unknown.

Purpose: The purpose of this study was to evaluate the CIELab and CIEDE2000 formulas to determine which best reflects the difference in color perception and whether color perception differs by sex.

A clinical study relating CIELCH coordinates to the color dimensions of the 3D-Master System in a Spanish population.

Statement Of Problem: The 3D-Master System comprises 26 physical shade tabs and intermediate shades. Determining the relationship among all the groups of lightness, chroma, and hue of the 3D-Master System (Vita Zahnfabrik) and the L*, C*, and h* coordinates is important, because according to the manufacturer, 2 Toothguide 3D-Master shades need to be mixed in a 50:50 ratio to create an intermediate shade.

Purpose: The purpose of the study was to relate the lightness, chroma, and hue groups of the 3D-Master System with the polar coordinates of the CIELAB chromatic space, L*, C*, and h*, and to quantify the shades tabs and intermediate shades of the 3D-Master System according to color coordinates.

Differences between the human eye and the spectrophotometer in the shade matching of tooth colour.

Objectives: The aim of this work was to assess the agreement between instrumental and visual colour matching.

Methods: Shade selection with the 3DMaster Toothguide (Vita-Zahnfabrik) was performed for 1361 maxillary central incisors and compared with the shade obtained with the EasyShade Compact (Vita-Zahnfabrik) spectrophotometer.

Results: We observed a greater correlation between the objective method and the subjective one in the colour dimension of lightness (Kappa 0.