Dentistry: Principles of Shade Selection
14 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What determines the color of an object?

  • The light that passes through an object
  • The light that is reflected from an object (correct)
  • The light that is absorbed by an object
  • The light that is emitted by an object

    • What is the role of light in perceiving color?

  • It reduces the color of an object
  • It has no effect on the color of an object
  • It determines the color of an object (correct)
  • It enhances the color of an object

    • What is essential for perceiving color?

  • The object's texture and material
  • The object's shape and size
  • The light that enters the human eye (correct)
  • The object's temperature and humidity

    • What happens to light when it encounters an object?

    <p>It is reflected by the object</p> Signup and view all the answers

    What is the result of light interacting with an object?

    <p>The object's color is perceived by the human eye</p> Signup and view all the answers

    What is responsible for the color of an object?

    <p>The light that is reflected from the object</p> Signup and view all the answers

    What is the role of the human eye in perceiving color?

    <p>It receives the light reflected from an object</p> Signup and view all the answers

    What is the relationship between light and color?

    <p>Light determines the color of an object</p> Signup and view all the answers

    What is necessary for color perception?

    <p>The presence of light</p> Signup and view all the answers

    What happens to color when viewed for a prolonged period?

    <p>It becomes dull</p> Signup and view all the answers

    What is the effect of viewing a pale blue or gray surface between shade matching?

    <p>It restores color vision</p> Signup and view all the answers

    What occurs when the chroma of a color is affected?

    <p>The color becomes less vibrant</p> Signup and view all the answers

    What is the result of adaptation to a particular color?

    <p>Decreased color sensitivity</p> Signup and view all the answers

    What is the purpose of viewing a pale blue or gray surface during shade matching?

    <p>To restore color vision</p> Signup and view all the answers

    Study Notes

    Shade Selection Principles

    • Position of the operator is between the patient and light source to evaluate shade accurately.
    • Evaluate shade under multiple light sources to ensure accuracy.

    Principles of Shade Selection (cont'd)

    • Carefully examine the tooth to determine the pattern of translucency and unique characterizing features such as craze lines, areas of hypo-calcification, etc.

    Shade Selection Systems

    • Commercial Shade Guides:
      • Most convenient and common method of making shade selections.
      • Guides consist of shade tabs with metal backing, opaque porcelain, and neck, body, and incisal color.
      • Select tab with the most natural intraoral appearance.

    Vita Classic Shade Guide

    • Very popular shade guide.
    • Tabs of similar hue are clustered into letter groups:
      • A (red-yellow)
      • B (yellow)
      • C (grey)
      • D (red-yellow-gray)
    • Chroma is designated with numerical values (e.g., A3 = hue of red-yellow, chroma of 3).
    • Manufacturer recommended sequence for shade matching:
      1. The more dentin fluoresces, the higher the chroma.

    Opalescence

    • Is a phenomenon in which the material appears to be of one color when light is reflected from it and of another color when light is transmitted from it.
    • In human enamel, it renders bluish in reflected color and orange brown in transmitted color, although it is colorless.

    Color and Light

    • The color of an object is determined by the light that is reflected from an object and entered the human eye.
    • Factors affecting perception of color include shade guide system and selection of tooth shade.

    Shade Consistency in Dentistry

    • Hue consistency among shade guides has not been proven and remains a significant challenge in maintaining a consistent shade from appointment to final restoration.

    Auxiliary Light Sources in Shade Matching

    • Ambient lighting in the dental operatory may not be ideal for visual shade matching.
    • The use of auxiliary lighting is recommended in such cases.

    Factors Affecting Crown Translucency

    • Increasing the translucency of a crown lowers its value due to less light returning to the eye.
    • Enamel translucency is affected by: • Angle of incidence • Surface texture • Wavelength

    Human Visual Perception

    • Rods are located at the periphery and are few in the center of the retina.
    • Rods are activated with low light, resulting in a duller color view (value).
    • Chroma, on the other hand, is related to color intensity.

    Color Vision Restoration

    • Viewing a pale blue or gray surface between shade matching can restore color vision.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    This quiz covers the principles of shade selection in dentistry, including the position of the operator and evaluating shades under multiple light sources.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser