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47 Cards in this Set
- Front
- Back
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What is the proper sequence for biomechanical preparation?
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1. Filing
2. Recaptiulation 3. Irrigation |
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The canals are kept moist during biomechanical preparation for: (choose the most appropriate answer for extracted teeth only)
a) antimicrobial action b) better tactile sensation c) lubrication d) tissue dissolution |
Lubrication
(actually after having our test review, I think that this is all of the above) |
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What is the significance of filing 0.5 mm from the radiographic apex?
a) distance between apical foramen and mental foramen b) distance between apical constriction and apical foramen c) distance between middle and apical one third of canal d) distance apical foramen from any apical pathosis |
b
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What is DG16 and when is it used?
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Endo Explorer used to locate canal orifices on pulpal floor
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What is a 3IL and when is it used?
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Endo Excavator used to remove debris from pulpul floor
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What is the Endo-Z bur and when is it used?
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Safe-end carbide bur used to unroof the pulp chamber
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According to ISO standards, what does D-4 stand for?
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Diameter of the file 4.0mm from the tip
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What is the taper (increase in diameter from tip to handle) on most hand files used for cleaning and shaping root canals?
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0.02 mm/mm of file length
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Keeping in mind your answers for the previous two questions, what would the value of D-5 for a #45 file be?
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0.55 mm
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Which of the following hand instruments has the greatest chance to separate (break) within the canal cleaning and shaping?
a) hedstrom file b) K-file c) reamer d) K-flex file |
Hedstrom file
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T/F
Lateral spreaders have a tapered tip. They can be used to vertically compact gutta percha in canals |
First staement is true second statement is false.
(horizontal) |
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T/F
Lateral condensation does not require sealer. The technique is as good as the warm vertical compaction technique. |
??
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What is the near ideal shape of the access for a maxillary premolar?
a) round b) ovoid c) trapezoidal d) triangular |
Ovoid
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What is the near ideal shape of the access for a maxillary incisor?
a) round b) ovoid c) trapezoidal d) triangular |
Triangular
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What is the proper bur angulation for initial incisor access?
a) 45 deg to the long axis of the tooth b) 60 deg to the long axis of the tooth c) 90 deg to the long axis of the tooth d) 30 deg to the long axis of the tooth |
45 deg to the long axis of the tooth
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A completed access includes all of the following except:
a) straight line access to canals b) Deroofing of pulp chamber c) flattening of pulpal floor d) removal of any debris in pulp chamber |
all except c
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Apart from normal tooth length values for teeth, what is the first clue to the approximate working length for any tooth?
a) working length xray b) master cone xray c) preoperative xray d) bitewing |
preoperative xray
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What is the best clue to the approximate depth of pulp chamber for endodontic therapy?
a) periapical xray film b) angled xray film c) occlusal film d) bitewing film |
periapical xray film
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Step back preparation facilitates all of the following except:
a) spreader penetration to apical 1/3 of canal b) continuous taper to prepared canal c) deeper penetration of accessory cones alongside the master cone d) removal of ledges from canal walls |
Spreader penetration to apical 1/3 of canal
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What does MAF stand for?
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Master Apical File
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Circumferential filing after step back preparation may be done with:
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Any file smaller than the master apical file
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To avoid spreader:
a) place spreader on different sides of the canal each time b) use an accessory gutta percha point that is bigger than the spreader c) place spreader in the same side of the canal each time d) place the gutta percha shorter than the length the spreader went to |
Place spreader in the same side of the canal each time
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To avoid ledging, transportation and blocking out the canal:
1. force a large file to working length first thing 2. do not flare the coronal portion of the canal 3. preflare the coronal 2/3 of the canal before instrumenting the apical 1/3 4. irrigate and recapitulate with a #10 file after each instrument |
3&4
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Straight line access is important:
a) only in posterior teeth b) only in the anterior teeth c) only in small canals d) none of the above |
none of the above
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The most common area perforated on anterior teeth is through the:
a) labial/buccal surface b) mesial c) distal d) palatal |
Labial/ buccal surface
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Files as opposed to reamers can be used in which of the following ways?
a) reamers b) watch-winding c) balanced forces d) quarter turn pull e) all of the above |
watch winding
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A standard #30 K file with a 0.02 taper would be what diameter at D4?
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0.38 mm
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Which of the following is not a property of sodium hypochlorite?
a) tissue dissolution b) antimicrobial c) eliminate pulpal hemorrhage d) anti inflammatory |
anti inflammatory
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The cross section of a reamer is ___ or ____
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Triangular or Rhomboidal
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In lateral condensation, gutta percha is molded in one direction to:
1. aid in the placement of additional lateral cones 2. avoid fatigue on the spreader 3. give more access and visibility to the canal 4. avoid extruding sealer through the apex |
1&3
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To avoid iatrogenically blocking canals:
a) prepare the canals dry for better visibility b) irrigate frequently with NaOCl c) do not recapitulate to avoid breaking instruments d) step back |
Irrigate frequently with NaOCl
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The largest and most easily located root canal on the mandibular molar is the:
a) mesial buccal b) distal c) mesial lingual d) middle lingual |
Distal
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The outline form for the maxillary first premolar is:
a) triangular b) rectangular c) ovoid d) round |
ovoid
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What is the major component of gutta percha?
a) barium sulfate b) highly refined natural gutta percha c) zinc silicate d) zinc oxide |
zinc oxide
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What is the proper liquid to powder ratio of ROTH sealer?
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1:1
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Tug back fit of the master gutta percha cone means:
a) slight resistance to removal from the canal b) covering the master cone with sealer c) fitting the master cone with a spreader d) using several accessory cones |
slight resistance to removal from the canal
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A root canal plugger is used in lateral condensation to:
1. fit accessory cones 2. condense the master cone in the apical 1/3 3. apically condense the warm gutta percha at the orifice of the canal |
2&3
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Which one of the following instruments are used to provide straight line access?
1. #2 round bur 2. #4 round bur 3. #56 fissure bur 4. Safe end bur |
safe end bur only
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NaOCl is used for the following reasons:
1. lubrication 2. removing the organic debris 3. disinfection of the root canal |
all of the above
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T/F
The maxillary and mandibular molars never have 5 canals |
False
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The lengths of the files are available in the following sizes:
1. 21 mm 2. 12. mm 3. 25 mm 4. 31 mm |
21 mm
25 mm 31 mm |
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What is the clinical designation of the endo explorer?
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DG16
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When establishing straight line acess to the root canal of a central incisor, the design should be:
a) The enamel outline should be placed on the lingual surface in the middle 1/3 of the tooth both mesiodistally and cervicoincisally b) the center of the enamel outline should enter through the cingulum 45 deg from the palate c) it doesn't matter as long as you don't perforate the tooth d) the outline should be off center and more towards the distal |
The enamel outline should be placed on the lingual surface in the middle of the 1/3 of the tooth both mesiodistally and cervicoincisally
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What percentage of the time are extra roots and canals encountered in the mandibular premolar?
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15-20%
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What is the average length of a maxillary canine?
a) 28.2mm b) 29mm c) 27mm d) 26.5mm |
26.5mm
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The bur of choice for the majority of endo cases is a ____. Its primary use is to remove the roof of all pulp chambers. Entry into the pulp chamber can also be gained with this bur.
a) #2 round carbide bur b) #4 round carbide bur c) #4 round diamond bur d) a carbide fissure bur e) endo Z bur |
#4 round carbide bur
Bad question because the endo Z bur is used for deroofing |
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The endodontic file that has a tapered round shaft of steel wire with many cutting teeth cut out at various intervals over the entire shaft is a
a) K type file b) Reamer c) Hedstrom file d) Broach e) Profile |
Broach
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