Operative Flashcards
What are the saliva antimicrobial properties
Proteins, enzymes and antibodies
Lysozymes: destroy cell walls
Lactoferrin: actively binds to iron
Lactoperoxidaze: Inactivates bacterial enzymes
Type A secretory Immunoglobulins; fight against S. mutants attacks.
What’s in saliva that helps remineralization
Calcium Phosphate Potassium fluoride ions Statherin cystatins Histatins proline-rich proteins
What problems come from reduce salivary flow
Prolonged pH depression Decreased: antibacterial effects ions available for remi elimination of microorganism
When should testing for S. mutant count should be done
Pt has one or more medical risk factors
pt has undergone antimicrobial therapy
pt presents with new incipient lesions
pt is undergoing orthodontic care
What interventions are recommended for high caries risk
3 month recall, prophy and Fl application OHI with aids dietary counseling bitewings every 6-12 months Rx dentifrice Xylitol gum, rinse
What interventions are recommended for moderate caries risk
4-6 month recall, prophy and FL application
reinforce OHI and diet.
Fl dentifrice and OTC rinse.
What are frank caries
caries that have progressed just into the DEJ
What are the zones of carious enamel
Surface; seems unaffected by caries.
Body; Largest zone, demineralizing phase
Dark zone; Inability to transmit polarized light
Translucent: deepest
What zones of carious dentin can be remineralized
the first three
Normal
Subtransparent
Transparent
What zones of carious dentin are infected and must be removed
Infected and Turbid
Initial pathway of demineralization on root caries is along the
Sharpey’s fibers of the cementum
What are the sign of rampant caries
Acute onset
often associated with pain
Deep and narrow presentation results in large cavitation
What are the seven common medication categories that reduce salivary function
Anticholinergics; Antipsychotics Antihistamines Anesthetics (Local) Benzodiazepines Beta-blockers Diuretics
Anticholinergic examples
Atropine, Scopolamine, Glycopyrolate
Diuretic examples
Hydrochlorothiazide
Antipsychotics examples
Chlorpromazine
Beta blocker examples
Atenolol
Benzodiazepine examples
Alprazolam
Antihistamine example
Chlorpheniramine
What is the criteria for diagnosing Pit and Fissure caries
FLOSS Flakiness of enamel Loss of translucency Opacity Stickiness Softening of the base of the pit and fissure
O caries are better detected on what type of RG
Pano
design of a chisel
cutting edge makes a 90 degree angle with the plane of the blade, blade has a one sided bevel
Chisels are used to
Plane and cleave enamel
The Chisel family is
CHAD Chisels Hoes Angle formers Discoids and cleoids
Design of a hatchet
Cutting edge is parallel with the plane of instrument, blade that ends in a cutting edge in the plane of the handle.
Hatchet family
HEG
Hatchets
Excavators
Gingival marginal trimmers
What is ultimate strength
Point on the stress-strain curve at which fracture occurs .
What is percolation
intermittent inlet and outlet of fluid leakage that can result in marginal decay.
What is the thermal conductivity of Tooth, ama, comp and gold
Tooth .002
Composite .002
Amalgam .05
Gold .7 degrees C/cm
What is the elastic limit
greatest stress an object can be subjected to in which it can still return to its original dimensions.
Gold->Enamel->amalgam->composite->dentin
What is proportionate limit
Stress at which the material no longer functions as elastic
Yield point
point at which permanent deformation takes place
What factors increase amalgam setting expansion
more free mercury
shorter trituration time
Small condensation pressure
Increased particle size
How does Cu contribute to amalgam alloys
Elimination of gamma 2
decrease in creep
What is the byproduct in amalgam that decreases marginal leakage
Tin sulfide
size of fine filler particles
0.5 to 3 micrometers
size of microfine filler particles
0.04 micrometers
What is mycrohybrid composite
combo of 0.04 and .5 to 3
What is the initiator in self cure systems and the activator
benzoyl peroxide and a tertiary amine
What is the filler content of flowable composite
<50%by vol
What is the filler content of condensable composites
> 65%
What is the average thickness of a base
1-2 mm
What i the average thickness of a cement
0.5 mm
What is the thickness of a liner
5 microns
What material is mostly used for final cementation of crown and bridges
GI
Zinc polycarboxylate
What is ZOE composed of
Zinc oxide rosin zinc acetate accelerator Eugenol liquid
What is a base used for
provide support and thermal protection for the pulp
CaOH base is used under
amalgam and composite restorations
What bases are used under gold restorations
Zinc phosphate or zinc polycarboxylate
What base is used as a direct pulp cap
zinc phosphate cement over CaOH
What is a liner
suspension of Dycal in water
What is a varnish
solution liners of resin (Copalite) in liquid
Do not use with composites
What are factors that might precipitate rampant caries
histological disadvantages poor hygiene drug abuse High-sugar diets decreased salivary conditions
What are six caries high risk factors
Restoration w/i the past three years visible cavitation Appliances visible plaque Inadequate saliva frequent carb intake
What are filler particles made up of for composites
Crystalline silica (quartz)
Lithium aluminum silicate
glasses
What is it used to form the matrix of composites
Bis-GMA (dimethacrylate)
UDMA (Oligomers)
What is the coupling agent of composites
silane
What initiators are used for composites
Benzoyl peroxide
diketone
Camphorquinone
