Objectives: The aim of the study was to evaluate the influence of layer thickness on the final color for different shade and opacity composite combinations in a laboratory set-up simulating a 2-layer stratification technique.
Methods: Resin disks of different thicknesses were made. From one composite system (Point4, Kerr Co.), four dentin shades were selected (A1, A2, A3, A4). For each shade, disks were produced of 0.5-3.0mm thickness, with increasing thickness steps of 0.5mm. Moreover, from the three translucent shades of the same system (T1, T2, T3) disks were made of 0.5-2.0mm thickness, again with increasing thickness steps of 0.5mm. For all 288 combinations of base+translucent material color was determined with a spectrophotometer.
Results: For a mounting layer thickness from 0.5 to 3.0mm of the base material, differences till to DeltaE=5.1 were recorded. These differences increased when the layer thickness of the translucent material decreased. The translucent shade also influence the final aspect of the samples, whereas each translucent shade acted differently dependent on their shade and their thickness. Their layer thickness played a significant role in color perception.
Significance: Layer thickness and the proportion of thicknesses of the dentin and translucent shade greatly influence the final aspect of a multi-layer composite restoration. Good understanding of the optical behavior of each composite system is essential in order to obtain high quality in aesthetic dentistry.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.dental.2007.06.026 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Ascertaining the Environmental Advantages of Pavement Designs Incorporating Recycled Content through a Parametric and Probabilistic Approach.
Environ Sci Technol
January 2025
College of Environmental Science and Engineering, Nankai University, 38 Tongyan Road, Jinnan District, 300350 Tianjin, China.
Reclaimed asphalt pavement (RAP) is a widely used end-of-life (EoL) material in asphalt pavements to increase the material circularity. However, the performance loss due to using RAP in the asphalt binder layer often requires a thicker layer, leading to additional material usage, energy consumption, and transportation effort. In this study, we developed a parametric and probabilistic life cycle assessment (LCA) framework to robustly compare various pavement designs incorporating recycled materials.
View Article and Find Full Text PDFDetachable Top Electrode-Organic Photodetector for Repeated Nondestructive Evaluation of Device Performance and Surface Analysis of the Active Layer.
ACS Appl Mater Interfaces
January 2025
Department of Electrical Engineering and Information Systems, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Organic photodetectors (OPDs) are key devices for monitoring vital signs, such as heart rate and blood oxygen level. For realizing the long-term measurement of biosignals, stable operation is essential. To improve the stability of OPDs, it is important to analyze each layer to understand the degradation mechanism.
View Article and Find Full Text PDFInnovative Method for Reliable Measurement of PEM Water Electrolyzer Component Resistances.
Small Methods
January 2025
Forschungszentrum Juelich GmbH, Institute of Energy Technologies, IET-4, Electrochemical Process Engineering, 52425, Juelich, Germany.
Understanding the sheet resistance of porous electrodes is essential for improving the performance of polymer electrolyte membrane (PEM) water electrolyzers and related technologies. Despite its importance, existing methods often fail to provide reliable and comprehensive data, especially for porous materials with complex morphologies and non-uniform thicknesses. This study introduces a robust and straightforward method for determining the sheet resistance of porous electrodes using a novel probe concept based on industrial printed circuit board (PCB) technology.
View Article and Find Full Text PDFVisible-Light Photo-Iniferter Polymerization of Molecularly Imprinted Polymers for Direct Integration with Nanotransducers.
Small Methods
January 2025
Laboratory of Analytical Chemistry, Department of Biological and Environmental Sciences and Technologies (Di.S.Te.B.A.), University of Salento, via Monteroni, Lecce, 73100, Italy.
Molecularly Imprinted Polymers (MIPs) have gained prominence as synthetic receptors, combining simplicity of synthesis with robust molecular recognition akin to antibodies and enzymes. One of their main application areas is chemical sensing. However, direct integration of MIPs with nanostructured transducers, crucial for enhancing sensing capabilities and broadening MIPs sensing applications, remains limited.
View Article and Find Full Text PDFEffect of Different Treatments on Retinal Thickness Changes in Patients With Multiple Sclerosis: A Review.
CNS Neurosci Ther
January 2025
Department of Neurology, Isfahan University of Medical Sciences, Isfahan, Iran.
Background: Multiple sclerosis (MS) is an autoimmune disorder affecting the central nervous system, with varying clinical manifestations such as optic neuritis, sensory disturbances, and brainstem syndromes. Disease progression is monitored through methods like MRI scans, disability scales, and optical coherence tomography (OCT), which can detect retinal thinning, even in the absence of optic neuritis. MS progression involves neurodegeneration, particularly trans-synaptic degeneration, which extends beyond the initial injury site.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!