"You should know" Flashcards
When should you check occlusion when prepping on the tooth and adjacent teeth?
BEFORE
Not just after the filling is done!
Materials used for indirect restorations
Lithium Disilicate (E.Max)
When to place indirect restorations
When margin exceeds ⅔ of the distance between central groove and cusp tip
Must cap weak cusps
When margins end ½ distance between central groove and cusp tip
Consider capping weak cusps
When should we use an Onlay instead of an Inlay?
When the BL width of the cavity preparation is
½ way between central groove and cusp tip - consider onlaying cusp
⅔ way between central groove and cusp tip - should onlay cusp
Where the cusps are undermined after caries removal
Where the occlusal of the tooth must be altered
Difference between gold and porcelain inlay/onlay..
Use a bevel on gold but NOT porcelain
Bevel on occlusal, axial-pulpal line angle, and gingival wall
Why do we use a dovetail on an inlay preparation?
Presents distal displacement
Porcelain onlay advantage
Reduced polymerization shrinkage
All shrinkage occurs in the laboratory, the only material that can shrink is the resin composite CEMENT which is used during cementation
Do porcelain onlays have a bevel?
No
Bulk of porcelain at margins
Porcelain inlays - provisional considerations
Use eugenol-free cement (eugenol interferes with bonding)
OR, if you must use cement containing eugenol, important to PUMICE the tooth well to remove eugenol
Feldspathic porcelain
Example: vita, sirona blocks
Flexural strength: 154 +/- 15 MPa
WEAKEST
Leucite reinforced
Example: IPS EMPRESS
Flexural strength: 160 MPa
MIDDLE
Lithium Disilicate
Example: E.Max
Flexural strength: 300-400 MPa
STRONGEST
If you’re going to do a veneer or crown, when do you whiten the teeth?
BEFORE
Do we do veneers on primary teeth?
No
contraindications:
Highly fluoridated teeth - bonding issues
Primary teeth
Which is better for polishing, microabrasion or macroabrasion?
Microabrasion
