Operative II - E1 Flashcards
3 advantages to Gold:
2 Disadvantages:
Less tooth removed (than crown), protects cusps, wear rates similar to enamel
Must have good tooth structure, Can’t oppose ceramic
What gold technique involves the least amount of crown removed?
Inlays
3 Disadvantages to Gold Inlays:
Relies on tooth strength to retain
Doesn’t protect cusps
Contraindicated for Endo or 2nd molars
2 Contraindications for Gold Inlays:
Endo
2nd Molars
Gold Onlays protect cusps and have what advantage over a Crown?
Less tooth removed
Gold Onlays rely on what?
Sound tooth structure
What is the most protective of all restorations?
Gold Crowns
Gold Crowns shouldn’t oppose what?
Ceramics
A Gold Inlay is _____ coronal
Gold Onlay is ____ coronal
Intra
Extra
A Gold Inlay is used only when enough tooth remains and doesn’t protect the tooth, and a Gold Onlay is only used if there are missing…
Cusps
T/F
An onlay prep has adequate retention and resistance form derived from both intra and extra coronal factors
True
In order to do a Gold Onlay you must have a ______ tooth with fractures that are where?
Vital
limited to coronal structure
5 Contraindications for Gold Onlays:
Bruxers
Aesthetics
Opposing ceramics
2nd Molars
Endo treated (brittle)
Why are Endodontically treated teeth contraindicated for Gold Onlays?
Brittle
An Onlay is by definition a conservative ______
Partial Crown
T/F
There is less chance of pulpal pathology since less tooth is removed in a Gold Onlay
True
Where are the margins in a Gold Onlay?
Supra-gingival
In a Gold Onlay prep, External walls are _______
Internal walls are _______
Converging
Diverging
T/F
For Gold Onlays, all internal line angles should by rounded
True
T/F
Gold can be thinner than ceramics, therefore preps can be more conservative
True
Gold Onlay prep - non-functional cusp reduced:
Functional cusp reduced:
- 0mm (greater than or equal to)
1. 5mm (greater than or equal to)
T/F
Gold is dimensionally stronger than ceramic or amalgam
True
Prep for Gold Onlay: angle of departure can be ______ than 90 degrees and the Isthmus may be ______
less than
narrower
2 reasons to Hood/Shoulder or Cover the functional cusp:
Functional cusp weak
Isthmus deep
Thickness of the Hood margin:
Height of Hood should be enough to ____ the cusp, which is usually below _____
1.0mm
protect, the pulpal floor
Gold is retained by what?
Friction
Because Gold is retained by Friction, the margins need to fit well and the Marginal Gap must be how wide?
30-50 microns
Taper of Gold Onlay prep:
For retention, add boxes where?
Add grooves where?
6 degrees
Accessory grooves
In boxes
Slots or troughs that add retention to Onlay preps do what?
Increase surface area
*must be divergent
An extracoronal extension onto the facial/lingual surface just past the proximal line angle of the tooth (increases retention/resistance)
Skirting
How much interproximal separation is required for Gold Onlay preps?
Gingival floor of box how wide?
Functional bevel:
Non-functional bevel
Isthmus dimensions:
- 5mm
- 2mm
- 0 - 1.5mm
- 5 - 0.75mm
2mm x 2mm
New bur w/ 3 degree divergence per side:
8847 016
In the clinic, check for clearance in Lateral Function
True
The Hood should be located _____ to the pulpal floor
Apical
2 reasons to Hood the Functional Cusp:
Reinforces functional cusp
Improves retention
Where is the Hood placed?
Why?
Below pulpal floor
prevents cusp fracture
Where would a skirt be larger to improve surface area for retention?
Distal
What is the function of cutting a bevel on the Functional Cusp?
Align cusps w/ adjacent teeth
Double bite, closed mouth, triple tray, check bite, and dual arch technique all mean the same thing
True
What occlusion Type must a pt have to use Double Bite (triple tray)?
Type I occlusal scheme (no alteration)
When use Metal Ion provisional?
When Resin (integrity)?
tooth significantly broken
tooth mostly intact
How to size a Metal Ion Temporary?
correct M-D width
If Metal Ion provisional has good retention…
If it is loose…
Cement w/ B and T
Add acrylic, then cement
Is anesthesia ever required for the cementation process?
yes
When should Prox contacts be checked when placing a gold crown?
First thing
after provisional is taken off, when first placed, but BEFORE cementation
When first placing a crown (before cementation), how do you check Prox contacts?
floss M and D
If the Gold Crown doesn’t seat fully, use a ______ abrasive to adjust the marked area of the Prox contacts
rubberized
*repeat process until perfect
Preparing for final cementation, _____ the inside of the olay, _____ the tooth, ______ the field (w/ throat pack) coat the crown making sure all ____ are covered, have the pt occlude on a ______.
*recheck margins, crown fit, clean, floss
sand blast
pumice
isolate
margins
bite stick
Check Occlusal clearance in _____ and ______
*for prep
MIP
Lateral Excursions
If a crown doesn’t seat fully, use _____ to mark the IP spot that’s giving trouble
Articulating paper
