24 Questions
What is a characteristic of proprietary shade guides supplied with a restorative composite resin system?
They have the same optical properties as the restorative material
What is a potential issue with polymer resin-based shade guides?
They become disinfected and get darker over time
What type of camera is recommended for dental photography?
Digital single-lens reflex (DSLR) camera
What is a common use of digital photography in dentistry?
In conjunction with general software programs
What is an advantage of using custom shade guides?
They are more accurate than proprietary shade guides
What is a type of device that has been used in dentistry for colour matching?
Spectrophotometer
What is the primary concern for colour and appearance in restorative dentistry?
Stability
What is a popular mobile app for colour management?
Not specified in the text
What is the name of the spectrophotometer that has remained on the market over many generations?
Vita Easyshade V
What is the purpose of dental shade guides?
To match the colour of the tooth
What is the advantage of ceramic-based tooth shade guides?
They are keyed to commercial composite resins
What is the limitation of dental shade guides?
They serve only as a guide and not as an exact colour matcher
What is the name of the most popular ceramic-based shade guide?
Vita classical A1–D4
Why are composite resins less desirable for restorative procedures?
They are less colour stable
What is the benefit of layering and blending in restorative dentistry?
It lessens the colour difference between the material and the tooth
What is a key consideration when choosing dental materials for restorative procedures?
The compatibility of the material with the tooth
What is a key factor to consider when controlling subjective variables in visual shade-matching?
All of the above
What is the purpose of Step 1 in the preshade-matching process?
To test for colour discrimination competency
Why is it important to use an illuminant that matches natural daylight in shade matching?
Because the way we perceive colour is greatly influenced by the light source used
What can change the overall colour perception of an object in visual shade-matching?
The surrounding conditions
Why is it recommended to perform shade matching at the beginning of the appointment?
To prevent eye fatigue and strain on the visual system
What happens to teeth during restorative field isolation in visual shade-matching?
They become less chromatic and more opaque
What is the goal of the five shade-matching steps in visual shade-matching?
To improve visual shade-matching performance
What can be used to cover sparkling jewellery or bright clothes in visual shade-matching?
A neutral-coloured patient napkin
Study Notes
Shade Guides
- A restorative system without a shade guide can use a ceramic shade guide as a starting reference.
- Proprietary shade guides supplied with a restorative composite resin system are often fabricated using the same restorative material.
Materials Used for Shade Guides
- Polymer Resin Based: beneficial initially, but colour stability may become a problem over time.
- Other Materials (Plastics/Acrylics): alternative materials used for custom shade guides.
- Ceramic Based: most logical starting point for shade matching, especially for direct restorative procedures.
Colour-matching Instruments
- Various devices used in dentistry: digital cameras, scanners, spectrophotometers, and colorimeters.
- The Vita Easyshade device is a popular spectrophotometer used for colour measurement.
Dental Photography
- Digital single-lens reflex (DSLR) cameras, portable cameras, and cell phones are used for digital photography.
- Factors to consider: lens type, flashes, mirrors, and retractors.
- General software programs (e.g. Adobe Photoshop) and mobile apps are used for colour management.
Visual Shade-matching Method
- Colour matching depends on controlling subjective variables and viewing conditions.
- Three preshade-matching steps: check colour vision, use colour-corrected lighting, and control surrounding conditions.
- Five shade-matching steps: perform at the beginning, consider tooth dehydration, and use a systematic approach.
Colour-related Properties of Restorative Materials
- Restorative materials should match the colour and optical properties of dentin and enamel.
- Compatibility: choose materials with shades that mimic dentin and enamel.
- Stability: colour stability is a concern, with composite resins being less stable than dental ceramics.
- Interactions: favourable colour interaction properties, such as layering and blending, can reduce colour differences.
Dental Shade Guides
- Dental shade guides are tab-based tools made from ceramic, resin, or other materials.
- Shade tabs are arranged according to a dimension of colour, but natural teeth's complex polychromatic nature limits their accuracy.
Understanding the use of shade guides in dental restorative systems, including polymer resin based guides and their optical properties.
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