Operative II - E1 Flashcards by Tim Agee

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

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What gold technique involves the least amount of crown removed?

Inlays

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3 Disadvantages to Gold Inlays:

Relies on tooth strength to retain

Doesn’t protect cusps

Contraindicated for Endo or 2nd molars

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2 Contraindications for Gold Inlays:

Endo

2nd Molars

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Gold Onlays protect cusps and have what advantage over a Crown?

Less tooth removed

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Gold Onlays rely on what?

Sound tooth structure

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What is the most protective of all restorations?

Gold Crowns

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Gold Crowns shouldn’t oppose what?

Ceramics

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A Gold Inlay is _____ coronal

Gold Onlay is ____ coronal

Intra

Extra

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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

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T/F

An onlay prep has adequate retention and resistance form derived from both intra and extra coronal factors

True

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In order to do a Gold Onlay you must have a ______ tooth with fractures that are where?

Vital

limited to coronal structure

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5 Contraindications for Gold Onlays:

Bruxers

Aesthetics

Opposing ceramics

2nd Molars

Endo treated (brittle)

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Why are Endodontically treated teeth contraindicated for Gold Onlays?

Brittle

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An Onlay is by definition a conservative ______

Partial Crown

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T/F

There is less chance of pulpal pathology since less tooth is removed in a Gold Onlay

True

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Where are the margins in a Gold Onlay?

Supra-gingival

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In a Gold Onlay prep, External walls are _______

Internal walls are _______

Converging

Diverging

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T/F

For Gold Onlays, all internal line angles should by rounded

True

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T/F

Gold can be thinner than ceramics, therefore preps can be more conservative

True

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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:

0. 5mm 1. 2mm 1. 0 - 1.5mm 0. 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