Implantology - site augmentation Flashcards
What is the rationale for performing site argumentation?
- To replace hard tissue deficit
- To replace soft tissue deficit
- To replace both HT and ST deficit
What is GBR?
Guided Bone Regeneration
- replaces hard tissue deficit
- uses a scaffold that allows for new bone growth, as well as a cell exclusion membrane
What is the point of having a cell exclusion membrane in GBR?
Cell exclusion membranes prevent unwanted cells from proliferating into that space and forming fibrous epithelial tissue. Allows for osteoblasts to grow.
List the function of a graft.
- Osseo-induction
- Osseo-conduction
- Osteogenic
What does an osteoconductive graft do?
Provide a scaffold only. Enables osteoblasts to start forming new bone and preserves space for the new bone to form.
What is the function of the scaffold?
- Porous structure allows for cell migration
- Allows for new BV to form
- Allows for osteoblasts to attach
E.g.: (Bio-oss = xeno, Bioceramic = allo)
What does an osteoinductive graft do?
Provides a scaffold AND induces new bone to form
How do the osteoinductive grafts induce new bone formation?
BMP’s (Bone Morphogenic Protein) stimulate the differentiation of mesenchymal cells into osteoblasts.
E.g.: DFDBA (allograft with human protein)
What does an osteogenic graft do?
Provide a scaffold AND generate new bone.
How does an osteogenic graft generate new bone?
From existing osteoblasts already contained within the graft.
E.g.: autogenous bone
Grafts can be b___ or p____.
blocks, particulates
What are particulate grafts?
Particles/small pieces of bone
Where can autogenous block grafts come from?
- The calvarium
- Mx tuberosity
- Md ramus (common, could be done adjacent to M3 surgery)
- Symphysis
How can you source autogenous particulate bone?
- During osteotomy
- Bone scrapers (anterior nasal spine)
- Bone mills
What are the types of augmentation?
- Peri-fixture placement
- Pre-fixture placement
