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Related Concept Videos

Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

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Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
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Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

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Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
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Author Spotlight: A Stable Phantom Material for Optical and Acoustic Imaging
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The optical property measuring methods for resin composite using multiple spectrophotometers.

Ji-Hun Youm1,2, Il Jun Jeong1, Jae-Sung Kwon1,2

  • 1Department and Research Institute of Dental Biomaterials and Bioengineering, Yonsei University College of Dentistry.

Dental Materials Journal
|June 2, 2024
PubMed
Summary

This study explored four methods for measuring resin composite translucency using spectrophotometers. All methods showed similar trends, indicating their potential for evaluating dental material translucency.

Keywords:
ColorReflectance modeSpectrumTranslucency measuring methodsTransmittance mode

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Area of Science:

  • Dental Materials Science
  • Optical Properties of Materials

Background:

  • Accurate assessment of resin composite translucency is crucial for aesthetic dental restorations.
  • Existing translucency measurement methods may lack standardization or comparability.

Purpose of the Study:

  • To propose and evaluate four distinct methods for measuring the translucency of resin composites.
  • To assess the consistency of these methods across different shades and spectrophotometers.

Main Methods:

  • Utilized four shades of resin composite and four spectrophotometers.
  • Employed four measurement techniques: reflectance colorimetry, reflectance spectrophotometry, transmittance colorimetry, and transmittance spectrophotometry.
  • Analyzed translucency parameters derived from each method.

Main Results:

  • Significant differences were observed among the translucency measurement methods.
  • Consistent tendencies in translucency parameters were noted across all tested spectrophotometers.
  • The four proposed methods demonstrated potential for reliable translucency evaluation.

Conclusions:

  • The four evaluated methods show promise as viable techniques for measuring resin composite translucency.
  • Despite inter-method variations, the observed consistency across spectrophotometers supports their potential application in dental material characterization.