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UV–Vis Spectrometers01:14

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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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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Spectrophotometry: Introduction01:16

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UV–Vis Spectroscopy of Conjugated Systems01:32

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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Evaluation of Photosynthetic Behaviors by Simultaneous Measurements of Leaf Reflectance and Chlorophyll Fluorescence Analyses
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Visual vs. Spectrophotometric Methods for Shade Selection.

Karl Glockner, Karl Glockner, Bernd Haiderer

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    Determining tooth color for aesthetic dentistry is crucial. This study found that visual shade matching under natural light is as effective as using the "Easy Shade" digital device.

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    Area of Science:

    • Dentistry
    • Dental Aesthetics
    • Colorimetry

    Background:

    • Tooth color is a key factor in aesthetic dentistry.
    • Accurate tooth shade selection is essential for successful dental restorations.
    • Traditional visual shade matching relies on subjective assessment under natural light.

    Purpose of the Study:

    • To compare the accuracy of tooth color determination using visual methods versus a digital device (Easy Shade).
    • To evaluate the effectiveness of digital shade matching in aesthetic dentistry.
    • To assess the reliability of the Easy Shade device in clinical settings.

    Main Methods:

    • A study involving 500 patients at Dental Clinic Graz, Austria.
    • Tooth color was assessed using both visual methods under natural light and the Easy Shade device.
    • Comparison of shade matching results obtained from both methods.

    Main Results:

    • No significant difference was found between visual and digital methods for tooth shade selection.
    • The Easy Shade device did not demonstrate superior accuracy compared to visual assessment under natural light.
    • Both methods yielded comparable results in determining tooth color.

    Conclusions:

    • Visual shade matching under natural light remains a reliable method in aesthetic dentistry.
    • Digital devices like Easy Shade do not offer a significant advantage over traditional visual methods for tooth color determination.
    • Further research may be needed to explore the nuances of digital colorimetry in dentistry.