pretty lecture lady Flashcards
most used restorative material (direct or indirect restorations)
composite resins
3 resin matrix
bis-GMA
UDMA
TEGDMA
high molecular weight???
bis-gma
increase the mechanical and physical property
filler particles (reinforcement of resin matrix
in composites, monomers to be coverted into:
this process is triggered by:
polymers
free radicals
classification of composites:
- filler particle size and size distribution (hybrid and nano*)
- handling characteristics
- type of polymerization
classification by handling characteristic :
1
2
3
- regular (many applications; versatile, layering tech., more esthetic
- flowable (better flowability and adaptation, polymerization shrinkage, under regular comp. class II)
- bulk fill
developed to enable restoration in single increment built up to 4-5mm
bulk fill composite
characteristics of bulk fill composites
- increased depth of cure (polymerization)
- reduce polymerization shrinkage stress
- improved adaptation to the surface of the cavity
- simplified placement tech.
~~~~how do bulk fill composites achieve these characteristics?
- modulating the polymerization reaction= relieving shrinkage stress
- depth of cure (polymerization)
- flowability and adaptation to the surfaces of the cavity
bulk filler composites filler particles:
-lower amount of filler particles
-pre-polymerized filler particles
-low elastic modulus= help absorb stresses
-added larger filler size particles
what kind of monomers do bulk filler composites used
- UDMA
-modified UDMA (adding aromatic groups)
-fragmentation dimethacrylate monomers