composite restorations a different way of thinking Flashcards
Composite resin
complex material in which two or more distinct complementary substances combine to produce structural or functional properties not present in any individual component
composition of dental composite resin and percentage
resin matrix(25%) - moomer - photoinitiator - accellerator - stabliser - inhibitor Filler (75%) - silane treated silica
what is a common photo initiator
camphorquionone
what are examples of monomers
TEGDMA
BisGMA
UDMA
Examples of accelerator in resins
4 dimethylaminobenzoate ester
examples of stabliizser
butilated hydroxytouene
example of resin inhibitor
2 hydroxy 4 methoxybenxopheone
classification catagoeies of dental composite resin
initiation technique
viscosity
filler size
clinical application
typesof initiation techniques
heat cure
self cure
light cure
dual cure
viscosity types
flowable
packable
filler size types
macrofilled
microfilled
nano filled
hybrid
clinical application types
direct (anterior posterior)
indirect in the lab
advantages of composites
1) Aesthetics
2) bonding to tooth structure
3) tooth sparing preparation
4) less costly and more conservative alternative to indirect restoration
5) easily repaired
6) reduced quantity of mercury exposure and environmental release
7) lack of corrosion
disadvantages of composites
1) composite shrinkage and microleakage
2) post op sensitivity due to microleakage
3) secondary caries
4) chipping and lower wear resistance than amalgam
5) technique sensitive
6) adverse biological reactions
what can dentine bonding agents cause (buiological considerations)
some pupal reactions
biological considersations of dental composite resins
oral lichenoid reactions
allergic reactiosn
biological considerations of indirect resin based materials
allergic reactions in patients, hand dermatitis in tehcnitiosn
aesthetic considerations colour wise in composites
Hue
Saturation
Value
what is hue
the actual colour
what is saturation
how strong the colour is
what is value
darkness/lightness of the colour
translucency
ability of the material to transmit light
dual shade dental composite resins
has enamel and dentine shade to match therefore providing ideal shade and translucency
Dentine bonding agen tyoes
2 step(etch and rinse- primer and bond together) or (self etch primer- etch and prime toegether) 3 step 1 step(self etch adhesive)
benefits of adhesion
1) creates a strong attachment to tooth tissue
2) resists polymerisation shrinkage and minimises leakage
3) tooth preparation limited to damaged/lost tooth tissue (no need for mechanical undercut)
4) supports weakened tooth structure
5) optical integrity at cavity margins
indications for composite
1) restoration of caries
2) repair of enamel and dentine fractures
3) tooth wear rehabilitation
4) to mask mild discoloration
5) as a temporary restoration for indirect veneer preparations
contra indications for composite
1) where there is insufficient tooth structure and enamel present for bonding
2) deep subgingival caries where moisture control is not possible
3) indirect restorations may be more appropriate for severely damaged and heavily restored teeth
4) allergic reaction to resin based dental materials
which technique for composites shows the most success
restorations with hybrid and microfilmed composites that were placed with enamel etching and rubber dam
