Implant articles Flashcards
approximately how many mm does the bone resorb apically after two stage implants are uncovered?
1.5-2 mm apically
what is the minimum amount of bone that should be retained between two impacts at the implant abutment level?
3 mm
What are only block grafts used for?
external augmentation of horizontal (veneer graft) or vertical alveolar ridge deficiencies, as well as combined defects.
T/F
simultaneous implant placement can be an option only in vertical grafts?
true? why?
describe the concept of guided bone regeneration?
use of barrier cell occlusives membranes for space provision over a vertical or horizontal defect, promoting the ingrowth of osteogenic cells, while preventing migration of undesired cells from the overlying soft tissue.
what is distraction osteogenesis?
relies on the biologic phenomenon that new bone fills in the gap defect created when two bone segments are slowly separated under tension.
how much bone can you gain with distraction osteogenesis?
3-20 mm of bone
what are disadvantages of DO?
partial relapse of initial bone height, change of distraction vector, basal bone or segment fracture, fracture of device, incomplete distraction, transient parasthesia
Can DO be used for narrow ridges?
not- generally just for vertical height?
what are interposition bone grafts used for?
AKA sandwich grafts, are exclusively used for the treatment of vertical defects. the osteotomized bone segment is not distracted, but initially secured in its final position using osteosynthesis plates
**one stage implants are not recommended here
Describe alveolar ridge expansion?
“bone splitting technique”
represents the horizontal equivalent to vertical distraction or interpositional grafting.
the gap created can be filled with material, but it seems to undergo spontaneous ossification
are success rates of alveolar ridge expansion typically higher in the maxilla or mandible?
maxilla
T/F
It has been proven that longer implants have a higher success rate?
false…hasn’t been proven yet?
why might you use zygomatic implants?
rehabilitation of severely resorbed or partially resected maxillae in combo with pre maxillary implants as alternative to bone grafting.
What can you do with your implant if you are trying to avoid using short implants or bone graft surgery?
parasinusal tilted implants! tilts at an angle. Very successful?
