Extensively Damaged Teeth Flashcards
What sort of retention features can be placed in vital teeth?
- Boxes
- Pins
- Grooves
- Bases
- Cores
How wide and deep must grooves be?
1.0mm wide and 1.0mm deep, and long as possible
Why are non-parallel pins placed in a tooth?
To retain a core buildup
How are pins placed?
- In sound dentin
- Not undermining enamel
- Avoiding perforations into PDL
- Doesn’t encroach on pulp
- Vertically in shoulders or ledges
- Surrounded by at least .5mm of dentin
Self threading pins are nearly _______ more retentive than cemented?
5 times
Threaded core pins are placed ______ deep, and cemented core pins are placed ______ deep.
- 2mm
- 4mm
What are cement bases used for?
- To protect pulp and eliminate undercuts in defects
- GI and polycarboxylate cements are excellent
- Can’t place retentive features in bases
When should a cusp be shortened?
All cusps thinner than half their height should be shortened
What core type can serve as a temp for weeks because of full contour restoration, and is best for subgingival, and is stronger?
Amalgam
What core type is easily molded, same day preps, greater microleakage and must extend below core build up?
Composite core
If pulp is questionable or any exposure, what must be completed first?
Endo therapy
When must you remove existing restorations before placing core buildups?
- Always remove all existing restorations
- Over one year old or did not place it
Placing retention, pins, grooves, and boxes in a base is the same as ________?
Not using them at all - retention and resistance forms must be placed into solid tooth structure
Why devitalize a tooth?
To obtain retention
Endodontic teeth are more prone to ______?
Fracture
