Class I and V Prep Fundamentals Flashcards
What are the ways to isolate for amalgam restorations?
- rubber dam
- cottom rolls
- retraction cord
- isovac
What is the reason for isolating the area during an amalgam restoration?
- visibility
- access
- moisture control
All undermined enamel must be _______ from all margins.
removed
What is enamel called that is not supported by dentin under it?
undermined enamel
Margins should be ___ degrees at the cavosurface on all axial surfaces?
90
On the occlusal surface the margins have to be at one type of angle?
slight obtuse (never acute)
The ideal preparations are how many mm into the dentin?
0.2 mm to 0.5 mm
What is the retention form?
holds a restoration in a tooth
What holds an amalgam restoration in?
by converging walls and/or by retention grooves
What does resistance form help with?
help the restoration and the tooth resist fracture
Having some areas on the floor of a multi-surface preparation that are perpendicular to occlusal forces make the RESTORATION _____ likely to fracture
less
Preparing to a proper depth prevents…
weakness in the restoration
What class is a buccal pit amalgam?
Class I
What is the occlusal amalgam depth?
0.2 mm inside DEJ
What is the plastic molar preparation depth for class I?
2 mm
