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Related Concept Videos

Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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Directing Effect of Substituents: ortho–para-Directing Groups01:14

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Ortho–para directors are substituent groups attached to the benzene ring and direct the addition of an electrophile to the positions ortho or para to the substituent. All electron-donating groups are considered ortho–para directors. They donate electrons to the ring and make the ring more electron-rich. The ring is therefore susceptible to the addition of electrophiles. Substituents such as amino, hydroxy, or alkoxy, containing lone pairs on the atom adjacent to the ring, donate...
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Relevant optical properties for direct restorative materials.

Oscar E Pecho1, Razvan Ghinea2, Erika A Navarro do Amaral3

  • 1Post-Graduate Program in Dentistry, Dental School, University of Passo Fundo, Campus I, BR 285, Km 171, 99001-970, Passo Fundo, RS, Brazil; Department of Optics, Faculty of Science, University of Granada, Campus Fuente Nueva, Edificio Mecenas, s/n 18071, Granada, Spain.

Dental Materials : Official Publication of the Academy of Dental Materials
|March 21, 2016
PubMed
Summary
This summary is machine-generated.

Whitened and translucent composite shades exhibit distinct optical properties, influencing esthetic dental restorations. Understanding these characteristics is crucial for achieving desired color outcomes in multilayered restorations.

Keywords:
Absorption coefficientColorDental compositesOpalescenceScattering coefficientTranslucency

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Area of Science:

  • Dental Materials Science
  • Optical Physics
  • Biomaterials

Background:

  • Direct esthetic restorative materials are crucial in modern dentistry.
  • Understanding their optical properties is key to successful shade matching and esthetics.
  • Whitened and translucent shades require specific evaluation.

Purpose of the Study:

  • To evaluate optical properties of esthetic direct restorative materials.
  • Focus on whitened and translucent shades.
  • Compare spectral reflectance, color coordinates, and derived optical parameters.

Main Methods:

  • Evaluated enamel (E), body (B), dentin (D), translucent (T), and whitened (Wh) shades.
  • Measured spectral reflectance (R%) and color coordinates (L*, a*, b*, C*, h°).
  • Calculated scattering (S), absorption (K) coefficients, transmittance (T%), translucency (TP), opalescence (OP), and whiteness index (W*).

Main Results:

  • Translucent (T) shades displayed unique spectral behavior with lower R%, S, K and higher T%, TP, OP values.
  • Whitened Body (WhB) shades differed in color and optical properties from standard Body (B) shades.
  • Whitened Enamel (WhE) shades showed similar whiteness index (W*) but higher transmittance (T%) and translucency parameter (TP) than Enamel (E) shades.

Conclusions:

  • The final color of esthetic restorations depends on both the intraoral background and the optical characteristics of multilayered composites.
  • Whitened and translucent shades possess distinct optical properties that must be considered.
  • Material selection and layering significantly impact the esthetic outcome.