Resto Mosby Flashcards
Protective mechanism of saliva
- Bacterial clearance
- Buffering action
- Antimicrobial action
- Remineralization
arge carbohydate protein molecule in saliva cause some bacteria to agglutinate & then be removed by swallowing the 1.5L of saliva formed each day
Glycoproteins
contains urea & other buffer that help to dilute any plaque acids
Saliva
Antimicrobial actions
Lysozyme
Lactoferrin
Lactoperoxidase
Type A Ig
destroys cell wall & causes membrane permeability of bacteria
Lysozyme
actively binds iron which is important for bacterial enzyme production & function . It may also destroy S. mutans
Lactoferrin
inactivated some bacterial enzymes
Lactoperoxidase
detected by clinical examination
indicating the interface between abutted restorations are detected by clinical examination are aacceptable
Fracture Lines
referred as desensitizers are effective disinfectants, provide cross-linking of any exposed dentin matrix & occlude (“plug”) dentinal tubules by cross-linking tubular proteins
- aqueous soln.
- xcontain Glutaraldehyde, hydroxyethylmethacrylatr (HEMA), benzalkonium chloride chlorhexidine
Sealers
provide barrier to protect dentin from residual reactants diffusing out of restorarion from oral fluids or from both which penetrate leaky tooth restoratin interfaces
Liners
typical liners used with direct restorations
CaOH
RMGI
used to provide thermal protection for the pulp & to supplement mechanical support for the restoration
Bases - 1-2 mm
more easily condensed than admixed amalgam
Spherical amalgam
determined by the ratio of prepared versus inprepared wallss within a tooth preparatipm
C - factor
higher C factor indicate
Increased chance for postoperative sensitivity
previous called total etch (etch enamel & dentin)
etching of dentin with acids along with the etching of enamel
Etch & Rinse
AKA multibottle or fourth generation system (etchant, primer , adhesive)
Etch & Rinse 3 strep systems
most bond strength is from the formation of the hybrid layer
Seals dentin - decreases postoperative sensitivity
Good dentin bonding strengths
Etch & Rinse 3 Step Systems / Multibottle or fourth generation system ( etchant, primer , adhesivej
AKA one bottle or 5th generation system (primer & adhesive are combined but still need etchant)
Etch & Rinse 2 step systems
primer & adhesive combined still require etchants most require wet bonding Bond mechanism is the hybrid layer formation very technique sensitive Must have dentin wettability just right Use primarily for direct procedures Not faster than multibottle materials
Etch & Rinse 2 step system ( one botthe / fifth generation system)
primer & adhesive are combined but still need etchant
Self etching systems types
- Self- etch one step system
2. Self etch two step
AKA as all in one- most risky category
Self- etch one step system
does not remove smear layer
very simple to use
not as good bond to a dentin
Self etch one step system
requires approximately 5 coats does not remove smear layer fast & easy no rinsing mo worry sbout moisture very low postoperstive sensitivity does not bond well to uncut enamel
Self- etch two step ( self- etch primer & then a bonding adhesive)
beveled shoulder design around a capped cusp
provides bracing
271 bur
0.5mm bevel prepared with diamond
Collar
extendsmcasring around LA increases retention form increases resistance form "Minicrown prep" Use diamond F& L result in 40* gold margin Gingival finish line is a chamfer
Skirt
