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72 Cards in this Set
- Front
- Back
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irrigants used
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NaOCl
EDTA Chlorohexidine |
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NaOCl
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removes vital and necrotic tissue
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EDTA
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removes smear layer on walls of the canal after preparation with instruments
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Chlorhexidine
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disinfect canal space
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what are K files made of
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stainless steel
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what are rotary files made of
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NiTi
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what are orifice shapers made of
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NiTi
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point to which tissue is removed and instruments shaped to
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minor constriction
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3 temp materials at VCU
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Cavit
IRM Triage |
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can you use Cavit in a vital tooth
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no, sucks out the moisture
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what is gutta percha
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naturally occurring polymer of isoprene (plastic)
extract from trees growing in the pacific rim |
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commercial form of gutta percha
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beta
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gutta percha components
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75% zinc oxide
20% gutta percha radio-opaquers, plasticizers, coloring agents |
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sealer we use
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zinc oxide powder
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what is in the zinc oxide powder that is the sealer that we use
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42% zinc oxide
27% staybelite 15% barium subcarbonate 15% barium sulfate 1% sodium borate |
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4 areas for single cone technique
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B canals of max molars
M canals of mand molars both canals of PMs some lateral incisors and mandibular incisors |
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4 parts of a conventional film
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outer cover
paper cover lead shield film |
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4 chemicals for dip tank
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developer
water fixer water |
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can you do a pulpotomy on a necrotic tooth
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no
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effective antibacterial against G- anaerobes, with high pH, must remain at least 1 week, but no more than one month
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CaOH, VCU uses Ultracal (35% CaOH + 2% Barium Sulfate)
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what lubricant is used in clinic
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RC prep
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what is in RC Prep
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15% EDTA + 10% urea peroxide
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what does RC Prep do
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chelating agent to break down dentin
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Gates #2 is equivalent to what K file size
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70 (green)
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Gates #3 is equivalent to what K file size
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90 (white)
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recapitulation
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reintroduction of small hand file to clean debris and make sure the glide path is still present
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what is the main determiner of density on the radiograph (mAs or kVp)
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mAs
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optimal setting for max contrast between RO and RL structure
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70 kV
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most popular irrigant
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sodium hypochlorite (NaOCl)
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advantages of NaOCl
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antimicrobial
dissolves vital and necrotic pulp inexpensive removes organic portion of smear layer |
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alternative irrigant and concentration
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2% chlorhexidine
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does 2% chlorhexidine dissolve tissue
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no, it is only antimicrobial
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what is the most effective in removing the organic portion of the smear layer
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NaOCl
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what is most effective in removing the inorganic portion of the smear layer
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17% EDTA
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clinic protocol for irrigation
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3% NaOCl (primary irrigant)
17% EDTA for 1 min prior to obtruration flush with saline 2% chlorhexidine for 1 min |
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what happens if you mix NaOCl and 2% chlorhexidine
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brown precipitate (parachloroaniline) that is carcinogenic
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what happens if you mix EDTA with 2% chlorhexidine
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forms harmless white precipitate (a salt)
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is NaOCl stored with a needle attached in the clinic
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No, NaOCl will form salt on metal of the needle
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NiTi rotary files used in what type of handpiece, torque, rpm
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high-torque slow speed with 150-300rpm
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instruments for obturation
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spreaders, pluggers, Glick No 1, locking cotton pliers, 5/7 plugger
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lengths available for gates
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15mm and 19mm
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IRM
1) what is it? 2) what is it used for? 3) what is it made of? |
1) intermediate restorative material
2) orifice barrier in posterior teeth and temp restorations 3) reinforced zinc oxide eugenol |
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endo ice
1) what is the temperature |
-50 degrees
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EPT...
what is it? when do you use it? |
electronic pulp sensitivity test
to test functional blood supply (i.e. indirect test for vitality) use isolation! |
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RC Prep
what is it? what does it do? what typed of agent is it? |
removes smear layer from dentin
chelating agent |
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what does RC Prep contain?
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EDTA, glycol and urea peroxide
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what does EDTA stand for
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ethylene diamine tetra acetic acid
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name for sealer
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AH Plus
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what does sealer contain
when is it used |
epoxy resin
apply to wall of root canal using small file and to gutta percha before condensing |
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what is cavit G
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a temporary filling material
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when is cavit g used
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after the 1st appointment and often has Fugi VII placed afterwards
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problems with electronic apex locator
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metal restorations
too dry or too wet lateral canals calcified canals too small filing pathology (cysts, too big of an apical constriction) |
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what is gutta percha made from
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natural rubber combined with zinc oxide
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what is ledermix
what are the active ingredients |
used to dress root canals if pulp is left in the tissue
contains triamcinolone acetate (antiinflammatory) and demethlychlortetralacyclin (antibiotic) it is used between appointments |
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what is LDF used for in endo
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laser doppler flowmetry
used to record blood flow in pulp |
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what is ProRoot MTA
what are the 4 main components |
MTA = mineral trioxide aggregate
1) tricalcium oxide 2) tricalcium aluminate 3) tricalcium silicate 4) silicate oxide |
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what are the 5 main uses of MTA
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root end fillings
repair of perforations management of open apices in immature roots direct pulp capping and pulpotomy root filling on its own (monoblock) |
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why was MTA chosen as a material for apicectomies
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it is less cytotoxic than amalgam
cementum grows over MTA so regeneration rather than repair can take place |
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what is the setting time for MTA
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3 hours
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what is the pH of MTA
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12.5
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what is used to insert MTA
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barnes gun or MTA dentsply gun
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why is bleach a better irrigant than chlorhexidine
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it kills bacteria and dissolves pulpal tissues
(CHX does not destroy soft tissue) |
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what is the main difference between GIC and IRM
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both are orifice barriers but GIC can bond to dentin and IRM can kill a huge number of bugs
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what is the key disadvantage of gutta percha
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it does not adhere to dentin and does not strengthen teeth
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why can a canal not be instrumented dry
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create dust and chunks of dentin that would clog canal space
create frictional heat |
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concentration of bleach in NaOCl
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6 or 5.25%--full strength, commercial bleach
3 or 2.6%--half strength |
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disadvantages of NaOCl
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toxic to vital tissues
dangerous if extruded from canal space |
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most effective in removing the organic portion of the smear layer
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NaOCl
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% EDTA
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17%
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DO NOT mix which two irrigants
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NaOCl with 2% chlorhexidine
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do not use what with rotary instruments
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lubricant (RC Prep)
use only with hand files! |
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Most important ingredient in the sealer we use
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1 chest hair from Dr. Archer
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