Resto Flashcards
Affected dentin (2)
Subtransparent dentin
Transparent dentin
Infected dentin (2)
Turbid
Infected dentin
Affected dentin characteristics (3)
Dry leathery texture
Capable to remineralize
Infected dentin characteristics
Soft mushy or cheesy texture
Zone of carious enamel
Translucent zone
Dark
body
Surface
Zone of bacterial invasion
Presence of bacteria in tubules
Turbid dentin
Demineralized softened dentin but no bacteria in tubules
Transparent dentin
Outermost carious zone with numerous mo
Infected dentin
Enamel aka substantia ____
Inorganic:___
Organic:_____
Adamantina
96-98%
2-4%
Dentin aka substantia ____
Inorganic
Organic
Ebornea
70 inorg
30 organic
Cementum aka substantia ____
Inorganic:___
Organic:____
Ossea
50%50%
Grass like or bush like or ribbon like hypomineralize enamel arising from DEJ
Enamel tufts
Hypomineralize enamel arising from DEJ or outer surf longer than tufts
Hair like strands
Enamel lamellae
Extensions of odontoblastic processes of enamel
Enamel spindle
Similar to bone
Cementum
Loc where fastest progression of caries
Dej
Dead odontoblast with empty tubules are known as
Dead tracts
Bleaching lasts โฆ.
6 mos to 1 yr
Process of setting of amalgam
Crystallization process
Corrosion by product of amalgam
Tin sulfide
High mercury in amalgam result to
Excessive expansion of amalgam
Mercury alloy ratio by weight
8: 5 old
1: 1 EAMES TECHNIQUE
Amalgam alloy less condensation force needed with faster working time
Spherical
Am alloy particle need more condensation and is easier to carve
Admixed
Am alloy need most amount of mercury
Irregular
Am alloy need least amount of mercury
Spherical
Am rxn strongest and corrodes least
Rxn bet ___ and ____
Gamma phase
Silver, tin
Second strongest phase of am rxn
With most numerous amalgam
Gamma one phase
Silver, mercury
Weakest and softest am rxn
Prone to microporosities
Gamma 2 phase
Tin, mercury
Seen in high copper am
Copper tin phase
% of copper in low copper amalgam
<6% cu
Or <10% other source
% of copper in high copper amalgam
> 9%-30%
10%- 30%
Inc expansion of amalgam is rel to (5)
Inc mercury Short trituration time Dec condensation pressure Inc particle size Moisture contamination
Time dimensional change due to constant stress
Creep
Contraction or expansion of a material
Dimensional change
Formation of oxides
Corrosion
A thin layer of corrosion at the top of resto
Loss of luster of amalgam
Tarnish
Procedure wherein amalgam is rubbed
Mulling
Common cause of amalgam chipping during carving
Carving when am hardened
Continuation of trituration processg
Mulling
Where thereโs ditching of am resto, when it is indic for replacement
> 0.5 mm
Distance from margin of mesial and distal wall to prox surf must not be less than
PM - 1.6 mm
Molar - 2 mm
Most difficult tooth to adapt matrix band
Max 1st pm - mesial developmental depression
Why is matrix band extended occlusally when restoring class 2 cavities
For overfilling
Common tooth prone to accidental pulpal exposure
Md 1st pm
Basic parts of handcutting instruments
Handle
Shank
Working end
Non cuttting instrument
Nib
Slightly curved chisel has _____ design
Wedelstaedt design
Straight chisel is similar to ____
Carpenterโs chisel
Chisel fam
CHAD
CHISEL
HOE
ANGLE FORMER
DISCOID AND CLEIOD
Hatchet fam
HEG
hatchets
Excavators
GMT
Composition of composites (3)
Filler part
Matrix
Coupling agent
Most common matrix in composite
Bis gma - bisphenol A-glycidyl methacrylate
For polishing composite
For amalgam
For gold
Aluminum oxide
Tin oxide
Iron oxide
Setting of composites
Polymerization process
Most common filler in composites
Colloidal silica
Bis gma invented by
Bowen 1962
Component of composites used to produce radiopacity (5)
Barium Zinc Boron Zirconium Yttrium
Bis gma radiolucent or opaque
Radiolucent
Disadv of polymerization
Shrinkage
Inhibits polymerization (2)
Eugenol
Cavity varnish
Ratio of bonded surface to the unbounded surfaces
Configuration factor
Etch is discovered by
Buonocore 1955
Which is better high or low c factor
Low c factor better
If high, shrinkage!!
Longest c factor
Class 1
Class of cavity with least C FACTOR
Class 4
Enamel and dentin is etched true or false
True
Etching (4)
Phosphoric acid
Edta
Maleic acid
Citric acid
Retention for composite chemical or mechanical
Micromechanical