Color Ranges and Distribution of Human Teeth: A Prospective Clinical Study.

Introduction: This study investigated the in vivo color range of human teeth using a research-grade noncontact spectroradiometer, analyzing the effects of gender, age, ethnicity, and lifestyle factors, including diet, smoking, and oral hygiene.

Materials And Methods: A total of 1004 participants were recruited at two research sites and stratified by gender, age, and ethnicity, and data on their dietary and oral habits were collected. Noninvasive color measurements of an upper central incisor were performed using a spectroradiometer and a fiber-coupled Xe-Arc light source.

Influence of preheating and water storage on the color, whiteness, and translucency of modern resin-based composites.

Objectives: To evaluate the influence of preheating and water storage on color, whiteness, and translucency of one-shaded, group-shaded, and multi-shaded resin-based composites.

Materials And Methods: A total of 270 samples were fabricated from one-shaded (Omnichroma), group-shaded (Optishade MD), and multi-shaded (Enamel Plus HRI) resin-based composites and divided into six groups: no heating (control) and 1-5 heatings (test) (n = 15). The CIE L*, a*, b*, C*, and h° color coordinates were registered over white, black, and gray backgrounds with a spectrophotometer before and after 24, 72, 144 h water storage.

Exploring the CIEDE2000 thresholds for lightness, chroma, and hue differences in dentistry.

Objective: To evaluate the perceptibility and acceptability CIEDE2000 (K:K:K) thresholds for lightness, chroma and hue differences in dentistry.

Method: A Python-based program was developed to conduct a psychophysical experiment based on visual assessments of computer-simulated images of human teeth. The experiment was performed on a calibrated display.

Visual evaluation of the color adjustment of single-shade and group shade resin composites in restorations with different cavity configurations.

Objective: To evaluate the influence of the tooth shade, type of resin composite and cavity configuration on the color adjustment of single-shade and group shade resin composites.

Methods: Class I and V cavities were prepared in artificial acrylic mandibular right molars with different shades - A1, A2, A3, A3.5 and A4.

Effectiveness and one-year whiteness stability of different in-office bleaching agents and alternative protocols.

Statement Of Problem: In-office bleaching has been widely researched. However, few studies have evaluated alternative protocols for this procedure. Moreover, information on the long-term stability of in-office whitening is limited.

A Spanish value set for the SF-6D based on the SF-12 v1.

Aim: This paper reports the first estimation of an SF-6D value set based on the SF-12 for Spain.

Methods: A representative sample (n = 1020) of the Spanish general population valued a selection of 56 hypothetical SF-6D health states by means of a probability lottery equivalent (PLE) method. The value set was derived using both random effects and mean models estimated by ordinary least squares (OLS).

Optical properties of dental zirconia, bovine dentin, and enamel-dentin structures.

Objective: To evaluate the optical properties and the relative translucency parameter of Ceramill ZI White (3Y-TZP) and Ceramill Zolid FX White (5Y-PSZ) zirconia ceramic systems and compare them with those of the bovine dentin and enamel/dentin structures.

Materials And Methods: 3Y-TZP and 5Y-PSZ zirconia ceramic systems were evaluated. A 0.

Unravelling the skills and motivations of Magdalenian artists in the depths of Atxurra Cave (Northern Spain).

Atxurra cave has a decorated assemblage composed of more than a hundred engraved animal depictions. All of them are located in deep parts of the cave and most of them are hidden in raised areas, away from the main path. The main sector is the "Ledge of the Horses", located at 330 m from the entrance of the cave.

Effect of layering strategy and prolonged water aging on masking ability of composite resins.

Statement Of Problem: Layered composite resins may adequately mask discolored substrates. However, whether color changes that occur over time affect masking ability is unclear.

Purpose: The purpose of this in vitro study was to investigate the effect of layering and water aging on the masking ability of 2 composite resins.

Vitamin D and monoclonal gammopathy of undetermined significance (MGUS) among U.S. Black women.

Purpose: Risk factors for monoclonal gammopathy of undetermined significance (MGUS), the asymptomatic precursor to multiple myeloma, are largely unknown. We hypothesized that low vitamin D levels might be associated with higher MGUS prevalence in a national cohort of U.S.

Flow-controlled ventilation and hi-flow nasal oxygen in laser surgery for a grade III subglottic stenosis patient.

A 49-year old patient (BMI 29.4kg/m and ASA III) with grade III subglottic stenosis (> ventilator in flow controlled ventilation mode, which allowed us to regulate both inspiratory and expiratory flow without compromising gas exchange despite maintaining peak FIO at 0.3 due to the risk of ignition.

Color stability and degree of conversion of gingiva-colored resin-based composites.

Objectives: To evaluate gingiva-colored resin-based composites' (GCRBC) color stability and degree of conversion (DC%).

Methods: Eight discs (8 × 1 mm) of 20 shades of GCRBC were prepared. Color coordinates were measured against a gray background with a calibrated spectroradiometer, CIE D65 illuminant and the CIE 45°/0° geometry at baseline and after 30 days of storage in distilled water, coffee, and red wine.

Textbook outcome in colon carcinoma: implications for overall survival and disease-free survival.

Background: Textbook outcome (TO) is a multidimensional quality management tool that uses a set of traditional surgical measures to reflect an "ideal" surgical result for a particular pathology. The aim of the present study is to record the rate of TO in patients undergoing elective surgery for colon cancer (CC).

Material And Methods: Retrospective study of all patients undergoing scheduled CC surgery at a Spanish university hospital from September 2012 to August 2016.

Color and Translucency Variation of a One-Shaded Resin-Based Composite after Repeated Heating Cycles and Staining.

(1) Background: This study aimed to determine the effect of repeated pre-polymerization heating on the color and translucency of a one-shaded resin-based composite and to evaluate whether the heating cycles affect its color stability. (2) Methods: Fifty-six samples of 1-mm thickness were fabricated from Omnichroma (OM) after applying different heating cycles (for one, five, and ten times at 45 °C) before polymerization ( = 14/group) and afterwards were stained with a yellow dye solution. CIE L*, a*, b*, C*, h° coordinates were recorded, and color differences, whiteness, and translucency were calculated, before and after staining.

Development of Thickness-Dependent Predictive Methods for the Estimation of the CIEL*a*b* Color Coordinates of Monolithic and Layered Dental Resin Composites.

Usually, dentin and enamel shades are layered in dental restorations with the purpose of mimicking the natural appearance of teeth. The main objective of this study was to develop and assess accuracy of a color-prediction method for both monolithic and layered dental resin-based composites with varying shades and under different illuminants. A total of 15 different shades of VITAPAN Excell, VITAPAN Dentine and VITA Physiodens as well as VITA Enamel of five different thicknesses (0.

Effect of thickness on color and translucency of a multi-color polymer-infiltrated ceramic-network material.

Objectives: To evaluate the effect of thickness on color and translucency of a multi-color polymer-infiltrated ceramic-network (PICN) material.

Methods: Specimens of 0.5, 1.

Validation of a Hyperspectral Imaging System for Color Measurement of In-Vivo Dental Structures.

A full comprehension of colorimetric relationships within and between teeth is key for aesthetic success of a dental restoration. In this sense, hyperspectral imaging can provide point-wise reliable measurements of the tooth surface, which can serve for this purpose. The aim of this study was to use a hyperspectral imaging system for the colorimetric characterization of 4 in-vivo maxillary anterior teeth and to cross-check the results with similar studies carried out with other measuring systems in order to validate the proposed capturing protocol.

Relevant optical properties for gingiva-colored resin-based composites.

Objectives: To evaluate the optical properties of gingiva-colored resin-based composites (GCRBCs).

Methods: Five discs (8 mm diameter x 1mm height) of 17 shades of GCRBCs were prepared. Diffuse reflectance was measured against white and black backgrounds using a calibrated spectroradiometer, CIE D65 illuminant and the CIE 45⁰/0⁰ geometry.

Optical Behavior of Human Skin Substitutes: Absorbance in the 200-400 nm UV Range.

The most recent generation of bioengineered human skin allows for the efficient treatment of patients with severe skin defects. Despite UV sunlight can seriously affect human skin, the optical behavior in the UV range of skin models is still unexplored. In the present study, absorbance and transmittance of the UGRSKIN bioartificial skin substitute generated with human skin cells combined with fibrin-agarose biomaterials were evaluated for: UV-C (200−280 nm), -B (280−315 nm), and -A (315−400 nm) spectral range after 7, 14, 21 and 28 days of ex vivo development.

Masking ability of resin composites: Effect of the layering strategy and substrate color.

Objective: To evaluate the effect of layering strategy and substrate color on the masking ability of resin composites.

Materials And Methods: A1-shaded specimens from Charisma Diamond and Filtek Z350XT were produced using different layering strategies. Color measurements were made by a reflectance spectrophotometer over A2, C2, A3.

CIEDE2000 lightness, chroma and hue human gingiva thresholds.

Objective: To determine the visual 50:50% perceptibility and acceptability CIEDE2000 lightness, chroma and hue human gingiva thresholds.

Methods: A psychophysical experiment based on visual assessments of simulated images of human gingiva on a calibrated display was performed. A 20-obsever panel (dentists and laypersons; n=10) evaluated three subsets of simulated human gingiva: lightness subset (|ΔL/ΔE|≥ 0.

Visual and instrumental coverage error of two dental shade guides: an in vivo study.

Objectives: This study aims to evaluate in vivo the color agreement between natural teeth and dental shade guides by means of visual and instrumental coverage error ([Formula: see text]) index.

Materials And Methods: The color of the middle third of 735 incisors was visually determined by two evaluators using the Vita Classical (VC) and Vita 3D Master (V3DM) shade guides. The color match between the natural tooth and the shade tab was rated as poor (P), good (G), or optimum (O) by each observer.

Does Backgrounds Color Influence the Appearance of Gingiva-Colored Resin-Based Composites?

Dental materials are mainly tested in vitro, so laboratory conditions must reproduce the oral environment to ensure the validity of their results. This study aimed to evaluate the influence of backgrounds on the color of gingiva-colored resin-based composites (GCRBC). Three discs of each of 20 shades of GCRBCs and each thickness (1 and 2 mm) were prepared.