Podcast
Questions and Answers
What should be done to the teeth before shade selection?
What should be done to the teeth before shade selection?
It is recommended to match shades under dehydrated conditions.
It is recommended to match shades under dehydrated conditions.
False
What should be done if a decision cannot be made between two shade tabs?
What should be done if a decision cannot be made between two shade tabs?
Match the gingival portion, then the incisal portion.
Moisten shade tabs as well as _________ prior to selection.
Moisten shade tabs as well as _________ prior to selection.
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What is the first step in the shade selection sequence?
What is the first step in the shade selection sequence?
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Match the shade selection system to its chromatic range:
Match the shade selection system to its chromatic range:
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What should you do with shade tabs before making a selection?
What should you do with shade tabs before making a selection?
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Viewing shade tabs through half-closed eyes can help increase the ability to match value.
Viewing shade tabs through half-closed eyes can help increase the ability to match value.
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What is a feature of ShadeScan technology?
What is a feature of ShadeScan technology?
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Color recording using smartphones requires a gray reference card.
Color recording using smartphones requires a gray reference card.
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Name one software used for digital shade analysis.
Name one software used for digital shade analysis.
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The technology that normalizes color images is called _____ software.
The technology that normalizes color images is called _____ software.
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Match the shade guide system with its description:
Match the shade guide system with its description:
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Which limitation affects digital shade guides?
Which limitation affects digital shade guides?
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Technicians and clinicians do not need training to use digital shade devices.
Technicians and clinicians do not need training to use digital shade devices.
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What adjustment is made to enhance shade tab selection in photography?
What adjustment is made to enhance shade tab selection in photography?
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Which of the following statements about the VITA classical shade guide is true?
Which of the following statements about the VITA classical shade guide is true?
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The bleached shades in the VITA 3D shade guide represent the darkest value.
The bleached shades in the VITA 3D shade guide represent the darkest value.
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What is the primary purpose of using the VITA Linear guide 3D-MASTER?
What is the primary purpose of using the VITA Linear guide 3D-MASTER?
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The VITA shade guides represent only about _____% of the color range of natural dentition.
The VITA shade guides represent only about _____% of the color range of natural dentition.
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Match the following shade groups with their corresponding colors:
Match the following shade groups with their corresponding colors:
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What should you start with when using the 3D-MASTER guide?
What should you start with when using the 3D-MASTER guide?
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Spectrophotometers measure color by comparing against internal reference colors.
Spectrophotometers measure color by comparing against internal reference colors.
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Name one of the limitations of conventional shade guides.
Name one of the limitations of conventional shade guides.
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Study Notes
Course Information
- Course Title: Clinical Fixed Prosthodontics V
- Course Code: PRO 325
- Topic of Lecture: Color science and shade selection
- Lecturer: Dr. Marwa Wahsh
- Post: Professor of Fixed Prosthodontics
- Faculty: Faculty of Dentistry
- Year: Fall 2024
- University: Galala University
- Partner University: Arizona State University
Color Matching
- Color matching is the process of selecting a shade of restorative material that matches the natural tooth color.
Visual Shade Matching
- Shade selection should be done quickly
- Glancing at a gray card can help rest the eyes
- Evaluate the entire shade guide
- Eliminate the worst match
- Moisten shade tabs and teeth; avoid dehydration
Shade Selection Sequence
- Seat the patient upright
- Observations should be quick
- Dentist should glance at a gray card to rest the eyes
- Scan the entire shade guide and eliminate the worst match
- Moisten shade tabs and teeth; avoid dehydration
- If a decision isn't possible, match the gingival portion; then the incisal portion
- Try viewing tabs through half-closed eyes to improve value matching
Shade Selection for Ceramic Laminate Veneers
- Take a photograph of the selected shade tab adjacent to the unprepared tooth structure;
- This photograph will serve as a reference shade for the technician.
Shade Selection for Stump
- Select the stump shade after the final tooth preparation.
- Restorations must compensate for a darker, higher chroma stump shade.
- Shade is frequently fabricated higher in value and lower in chroma in the correct hue.
Shade Guides
- Dentin shade guides are used to communicate the color of the prepared tooth when using translucent ceramic.
Shade Guide Systems
- Vita Classical. 1-4, 1 is least chromatic, 4 is most.
- Ivoclar Chromascop. 10-40, 10 is least chromatic, 40 is most.
Additional Information
- Higher numbers in the Vita classical shade guide are more chromatic, and lower numbers have a higher value (e.g., lighter).
- From left to right on the guide, chroma increases and value decreases.
- There are different groups classified according to hue; orange, yellow, yellow-grey, brown-grey
- Digitalized images assist in the process
- Color-measuring instruments like spectrophotometers are used.
Spot Capture Systems
- Vita Easyshade
- ShadeEye NCC
- Shade star
Complete-Tooth Capture Systems
- ShadeVision
- ShadeScan
- Digital image capture
- Windows-based analysis software
Digital Shade Selection
- The acquisition of photographs from a digital camera at standardized parameters
- Use gray card for white balance
- Use image-analyzing software (e.g., Adobe Photoshop CS) to calculate L*a*b* values.
ClearMatch
- Software used with digital cameras.
- Normalizes color images
- Contains all major shade guide systems
- Allows custom guides to be added.
Color Recording Using Smartphones
- Smartphones can record color parameters with a gray reference card.
- External LED Video Light is used for accurate image capture
- Selected shade tabs are positioned near the target tooth after color correction, increasing contrast and decreasing brightness for proper shade selection.
- Digital photographs of selected tabs are measured to determine the chroma.
IPS Shade Navigation App
- A series of steps for digital shade selection process utilizing a smartphone.
Limitations of Digital Shade Guides
- Technicians and clinicians require an understanding of color mapping techniques.
- Training is necessary for using these devices.
- Some devices do not cover the entire tooth surface.
- Some devices do not measure translucency, texture effects, and subsurface color.
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Description
This quiz covers essential techniques for dental shade selection, including how to prepare teeth and shade tabs before making a selection. Explore the features of advanced technologies like ShadeScan and digital shade analysis software. Test your knowledge on the color matching process in dentistry.
