RPD II Flashcards
How is the Tx plan for an RPD pt finalized?
Diagnostic Assessment
*with casts
T/F
You might need to remove Tori surgically before making an RPD
True
What is the final mouth prep alteration done before accepting the definitive RPD design?
Alteration of Abutment contours
*can only be limited changes in enamel
How are major contour changes prior to RPD definitive design accomplished?
Crown
T/F
Rest seats are done entirely in enamel
True
T/F
Because rest seats are done entirely in enamel anesthesia is avoided so pt can tell dentist when sensitivity is felt
True
Prepare occlusal rest seats with medium round burs # ___ or # ___
2 or #4
Tooth prep sequence (3 things):
Guide Planes
Enameloplasty
Rest seats
T/F
Undercuts should be gentle when making enameloplasty
True
M/D measurement for Rest Seats:
2.5 mm
T/F
Alternative cingulum rests are smile shaped
True
For a Master Cast: How much space should be in the Custom Tray made by light cured resin?
How is this attained?
2 mm
Wax spacer
How many pounds should stone be vacuumed under?
27 lbs
In what 2 cases would you use Record Bases?
Not enough teeth for stable interdigitation
if mount in CR
T/F
Making Record Base: Blue line at vestibule depth, , adapt 15 mm strip of Triad, cut with Bard Parker knife
True
T/F
Do not remove material from the Intaglio Surface of a Record Base
True
How much space should there be between the Record Base and the opposing teeth?
1-2 mm
2 options for making a bite registration for a Record Base:
Notch ridge and apply PVS (Regisil), trim to cusp tips
Notch ridge and apply Aluwax, trim to cusp tips
Most states require lab work authorizations to be made in ______
Duplicate
both dentist and laboratory must keep on record for specified period
Cobalt - Chromium:
According to ANSI/ADA Specification 14, weight of chromium shouldn’t be less than ____%
Total weight of chromium, ____, and _____, should be no less than ______
20%
cobalt, nickel, 85%
Alloys used in RPD’s must comply with requirements to what 3 factors?
Toxicity
Hypersensitivity
Corrosion
Alloy minimum value for elongation:
Yield Strength:
Elastic modulus:
1.5%
500 MPa
170 GPa
3 elements accounting for 82 - 92% of weight for most dental restoration alloys?
Chromium
Cobalt
Nickel
T/F
Chromium, Cobalt, and Nickel have relatively little effect on alloy properties
True
*properties determined by carbon, molybdenum, beryllium, tungsten, and aluminum