Exam (elaborations)
Chapter 13. Abrasion, Finishing, Polishing, and Cleaning
- Course
- Dental materials
- Institution
- Dental Assisting School
Chapter 13. Abrasion, Finishing, Polishing, and Cleaning
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Chapter 13. Abrasion, Finishing, Polishing, andCleaning
1. what is the goal of finishing and polishing restorations?:
is to remove excess material (flash), smooth roughened surfaces
and produce esthetically pleasing appearances with minimum
trauma to hard and soft tissues
2. why do we polish?: to get smooth margins, so the plaque
doesn't adhere and it reduces the risk of caries
3. what 3 things is the rate of abrasion determined by?: 1.
size, irregularity and hardness of the particles
2. number of particles contacting the surface
3. the pressure and speed with which particles are applied
4. the effect of abrasion is directly related to the properties of the
abrasive and the material it is abrading (true or false): true
5. hardness is the ability of material to resist abrasion (true or
false): true
, 6. what does the size, irregularity and hardness of the particle
size determine?: determines the depth of the scratches and the
amount of material being removed
(ex: pumice is not recommended for mild stain)
7. according to the moh hardness scale, what is the hardest
material?: diamond
8. according to moh hardness scale, what is the least hardest
material?: gold
9. what are some examples of abrasives?: -carbide finishing bur
-silicon carbide
-aluminum oxide
-sand/quartz
-pumice
10. carbide finishing bur: the more flutes the finer the finish (primarily
used for finishing)
11. silicon carbide: -coated disks
-rotary devices
-used in finishing procedures
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