Final Flashcards
Why is prosthetic space important?
different materials require certain space to function properly with reduced problems and prosthetic space decreases stress
When is bone sounding better than cone beam and visa versa
bone sounding gives you a better idea of soft tissue
CBCT is best for bony to bony measurements
what is a good indicator that the implant can be immediately loaded?
surgical torque value when placed
when placing an implant, what are the thicknesses of tissue from free gingival margin to bone going to be at papilla and zenith points?
5mm at papilla
3mm at zenith
what are 2 contraindications for implants?
IV bisphosphenates and radiation therapy to the jaw
what are 4 implant risk factors?
- smoking
- periodontal disease
- oral bisphosphenates
- bruxism
Discuss the difference between 4 implants in front of the mental foraminous and 4 spread widely apart (2 in front, 2 behind)
Putting all 4 implants between foraminous gives you A-P rocking
4 Spread widely increases your AP spread and reduces rocking
Discuss splinting implants with bars on maxilla vs mandible
Splinting maxilla makes 10% difference increase in implant success
NO difference on mandible
Describe the value of over denture over a bar or hybrid denture
Over dentures are easier to clean, easier to fix and less expensive
Describe value of hybrid denture over an overdenture
hybrids crush food better and you get the feeling of having “normal” teeth, also do very good sociologically
describe value of bar retained over an overdenture
a bar retained allows cleaning and crushes food better (70%)
Advantages of stock abutments
- a little cheaper
- you can keep them on hand
Advantages of custom abutments
better adapted to tissue
better crown support
-better emergence profile
WHAT instrument used to remove screws that have been torqued to manufactures instruction
torque wrench
what instrument used to remove locator liners, locator abutments and places liners?
locator core tool
disadvantages of cement retained crowns are
when they do come loose, you have to access through the crown
have junction at gemlike–>becomes visible w/recession
advantages of cement retained crown
can put access anywhere
more matrial variablilty
better esthetics
zirconia abutment option
advantages of screw retained crown
no cement in sulcus
less expensive
fast delivery
can retrieve at any time
disadvantages of screw retained crown
changes work flow since were used to cementing crowns
access placement is less in our control
what is the min. height difference between screw retained and cement retained crowns?
5mm or less=screw retained
what substructure material is most translucent?
zirconia
what substructure material is strongest?
metal (PFM or base metal)
what substructure has ability to have its screw accessed from a different angle than the long access of the implant?
single units: zirconia
full arch-titanium or non-precious metals
what substructure material is weakest?
zirconia
what substructure materials can be screw retained?
metal and zirconia
what is a voxel?
3D version of a pixel to measure volume. Helps understand depths in CBCT
Describe purposes between bone reduction guide and implant placement template
reduction guide- can be used for dentures or implant so the prosthetic fits better
IPT-directs position in 3 dimensions for implant placement
When the head of a screw breaks off why does the screw require less force to remove?
the spring doesn’t have tension pushing against the threads that the head of the screw provided
would your temporary implant abutment for single unit be better as engaging abutment or non-engaging?
engaging because any movement could lead to infection, necrosis of tissue, tissue being pinched.
If for a bridge then use non-engaging
Why would you risk implant failure to immediately temporize an implant?
to hold the position of the bone
T or F: over dentures and single unit implants utilize arbitrary implant placement?
False, just dentures
what can you do to avoid locking a denture in during direct pickup of locator housings?
put white spacers on
watch for undercuts
Describe platform switching
prosthetic component more narrow than platform so you get less bone loss
What can you do to avoid incorrectly eating implant coping if most of the implant platforms are below the gums?
x ray it
3 reasons implant impression coping for single unit wouldn’t seat properly when taking impression
- bone grown over site
- tissue overgrowth/pinched
- hex off, timing incorrect
Describe direct technique for placing locator housings in a denture
- housings put on with white spacers
- cut holes into denture so rests only on tissue
- place acrylic in holes
- place denture on top of housings and let acrylic set up
what is the difference between external hex implant and internal hex implant?
external hex is easier to remove for bridges, does anti-rotational but not as good as internal
internal hex has larger surface area to help resist dislodgment and better anti-rotational properties
whats the difference between implant analog and implant replica?
THERe IS NO DIFFERENCE
open tray implant impression vs closed tray
open tray has holes in the bottom of the tray so you can unscrew the coping. It can be used on any case
closed tray type of impression were used to so its predictable, but can’t use for diverging implants
