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Related Concept Videos

Veneer01:19

Veneer

65
Veneer refers to a thin sheet of wood, typically produced to a thickness of about one-eighth of an inch or less. This material is crafted through various methods, the most common being rotary cutting. In this process, a log is mounted into a large lathe and spun against a knife edge, peeling off a continuous strip of wood as the knife penetrates deeper into the rotating log, creating a rotary-cut veneer.
Other veneering techniques include plain-slicing, quarter-slicing, and rift-slicing. These...
65
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Related Experiment Video

Updated: May 21, 2025

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
07:42

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Published on: December 20, 2024

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Shade Modulation Ability of Direct vs. Direct-Indirect Prepless Composite Veneers.

Yazeed Altamimi1, Newton Fahl2, Mateus G Rocha3

  • 1Department of Restorative Dentistry, College of Dentistry, University of Hail, Hail, Saudi Arabia.

Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [Et Al.]
|March 17, 2025
PubMed
Summary

Direct-indirect prepless composite veneers showed instrumental shade differences compared to direct veneers, but visual assessments revealed no mismatch. Cement shade did not impact the final color of composite veneers.

Keywords:
composite resinconservativeshade matchingveneers

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Area of Science:

  • Dental Materials Science
  • Restorative Dentistry
  • Esthetic Dentistry

Background:

  • Direct-indirect prepless composite veneers offer an alternative for esthetic restorations.
  • Understanding shade modulation is crucial for achieving predictable esthetic outcomes with these veneers.

Purpose of the Study:

  • To evaluate the shade modulation capability of direct-indirect prepless composite veneers.
  • To compare instrumental and visual assessments of shade differences using various composite resins and cement shades.

Main Methods:

  • Fabricated 270 direct and direct-indirect composite veneer samples with varying thicknesses (0.3, 0.5, 0.7 mm) using three composite resins.
  • Bonded veneers to a standard C4 shade substrate using two cement shades (Variolink Esthetic LC neutral and light).
  • Assessed color differences (ΔE₀₀) using spectrophotometry (instrumental) and evaluation by four dental professionals (visual).

Main Results:

  • Instrumental color differences were significantly influenced by veneer technique, thickness, and composite resin type (p < 0.001).
  • Cement shade did not statistically influence the final shade of direct-indirect veneers (p = 0.168).
  • Visual assessment showed no significant shade mismatch between direct and direct-indirect veneer samples.

Conclusions:

  • A discrepancy exists between instrumental and visual evaluations regarding shade differences in direct versus direct-indirect prepless composite veneers.
  • The choice of cement shade did not affect the final esthetic outcome of the composite veneers in this study.