Week 10- Optical Devices for Endodontic Tx Flashcards
Describe characteristics of dental mirrors
- Small size for endo procedures
- Front surface coated
- Flat surface, not concave
What are basic optical instruments?
- Mirror
- Additional light
- Loupes
Does large or small angle produce magnification?
Large angle
Does large or small distance produce magnification?
Small distance
Describe relationship between distance to objects and lense curvature
- Close to object = strong lens curvature (can produce blurred picture and eye muscles will get tired)
- Distant Object = lens slightly curved
What are characteristics of Galilei Loupes?
- 2 lens system
- Short length
- Low weight
- Range 1.8-3x
Describe curvature of galilei loupes lens at front and back
- Convex at front
- Concave at back
What are characterstics of Kepler loupes?
- 2 lens system and prism to rotate picture
- Large field of view
- High weight
- Range 3-6x magnification
What are benefits of loupes?
- Good ergonomics
- Accommodation should be possible with relaxed lens
What are the 2 types of loupes?
- Galilei
- Kepler
What should head angle be for loupes?
25 degrees
What is working distance for loupes?
330-550mm
What is the depth of field?
Area where you see sharp image
- Depth of field is large for loupes with small magnification
- Depth of field is smaller for loupes with larger magnification
Describe relationship between magnification and field of view and depth of field
High magnification = small field of view & small depth of field
What is 1.8-2.5x magnification loupes used for?
General work
