Operative IV FINAL Flashcards
Primary source of retention with a porcelain veneer is :
Mechanical
What do silanes do
Help resin wet the entire surface and form a chemical bond
T/F all cements require applying adhesive to silanated Veneer
False
When removing excess resin cement from a veneer, use micro brush in what direction
Gingival direction. Incisal will displace veneer
How is a surgical blade used
Secure finger rest
Short shaving strokes
Parallel to veneer margins
_ is used to remove excess cement
_ is used to recontour sealed margins
Flame shaped carbide
Flame shaped diamond
Why use thicker porcelain with extra die spacer in veneers
Deeper preps (discolorations)
More opacity in ceramic to mask discoloration
Ceramic veneers should be etched with
HF
In dentin, veneers _ more than _
De-bond more than fracture
Indications for cast metal restorations
Large, failing restorations Teeth at risk of fracture Endodontically treated teeth Diastema closure Occlusal plane correction RPD abutment
Contraindications for cast metal restorations
High caries rate
Young patients
Esthetics
Small restorations
Primary retention features of cast metal inlays
Resistance?
Walls of isthmus and box
Dovetail, box forms, rounded internal line angles, adequate cusp thickness and dentin support
Cast metal primary flare vs. secondary flare
1˚ - B/L walls of proximal box
2˚ - bevel on exterior surface
Angle on gingival bevel
Why
Angle on occlusal bevel
30˚
Improves margin seal
Burnishability
40˚
Taper on metal vs tooth colored inlays
Metal 2-5˚
Ceramic 6-10˚
