6/26 & 8/8 - Try In and Adjustment of Gold Restorations, 387-398, S5-S8 (Heavy Emphasis) Flashcards
do you use anesthetic when trying and adjusting gold restorations
depends
Anesthesia ruins pts occlusal perception which may help when seating
what symptoms do you assess during try-in and adjustment of gold restorations
- hypersensitivity
- provisional hyper occlusion
- additional thermal and chemical trauma of permanent cementation
can you cement a permanent crown over a symptomatic tooth
NEVER
how do you prevent swallowing or aspiration of crown
- safety ring and floss
- floss around bridges
how much floss to use as safety
1 foot
what can you use to remove provisional
- walls carver or discoid end of cleoid-discoid
- hemostat or backhaus forceps
- straight chisel and mallet
- Richwil (Almore) crown removal
what is the cementation sequence
KNOW THIS!!! PMOCE
- proximal contacts
- margins (completeness of seating e.g., “fit”)
- occlusion
- contours
- esthetics
what do you use to check proximal contacts
floss
proximal contacts should be adjusted to equal what
other contacts in the mouth
when checking proximal contacts, should you make sure the crown doesn’t wobble off prepped tooth
YES
T/F: the perception of the patient in most cases will be able to help with determining proximal contacts
TRUE
what is considered an open margin
50 microns and tip of explorer
what are the three types of defective margins
- overhangs (overextended and thick)
- ledge (underextended)
- open
what type of overhang can you absolutely not cement? why?
open - bacteria will accumulate in this area
what typically causes a defective margin
undercut, an unseen defect, or distortion
what materials can be used to locate internal discrepencies
- chloroform and rouge
- occlude
- disclosing wax
- fit checker
T/F: you can burnish all accessible margins intraorally with a smooth, dull instrument
TRUE
if the patient can hold shim stock on adjacent teeth without but not with the crown, the crown is too [low or high]
HIGH
instead of testing shim with just shim and hand, grady does what in presentation
shim and articulating forceps (slide 12)
a premature contact on the buccal incline of the maxillary palatal cusp produces a ___ shift of the mandible
buccal
a premature contact on the palatal slope of the maxillary cusp produces a ___ shift of the mandible
lingual
a premature contact on the palatal incline of the maxillary cusp produces a ___ shift of the mandible
lingual
what interferences are you looking for when checking occlusion for crown
- nonworking interference
- working interference
- protrusive inteference
what do you use to remove sprew from crown
Joe Dandy/separating disc
when checking proximal contacts of your crown, should you adjust one side at a time
Yep
what bur to put anatomy into metal crown
round acrylic bur
should you polish parallel to the margin of the crown?
NO! do it perpendicular
can you use round acrylic bur to burnish metal crown
yes
what is the name of the green, sticky cube that could be used to remove crown? how to use it?
Richwil crown remover
- cube softened in hot water and placed over the crown.
- patient is instructed to bite onto cube and hold for few seconds
- quick opening of mouth should remove crown from prep (requires firm, natural opposing teeth with no cemented restorations on them)
what to check during clinical try-in of fixed restorations
- proximals
- margins = fit
- occlusion
- shade (also contour, texture and characterization)
what types of occlusion should be evalulated during try in
centric and eccentric
what is the minimum thickness of a crown
0.5 mm
Red = overhang (overextended, thick)
Green = open
Yellow = ledge (under extended)
