ENDO OSCE COMPREHENSIVE EXAM UPDATED
QUESTIONS AND SOLUTIONS GRADED A+
✔✔what is the crown down technique? - ✔✔start with larger rotary file down to
resistance, irrigate with 10 file to maintain path, move down sizes until reaching FWL
repeat until apical portion is at least #35.04
✔✔how should the MAF fit into the canal? - ✔✔"snug"
✔✔why do we obturate the canal system? - ✔✔to create a fluid tight seal along the
entire length of the canal
✔✔what are the size ranges of master cones? - ✔✔15-140
✔✔what are the taper sizes of master cones? - ✔✔.02,.04.06
✔✔function of accessory cones - ✔✔fill voids/spaces between master cone and the
canal walls
✔✔sizes of accessory cones - ✔✔x-fine, fine-fine, medium-fine, fine, fine-medium,
medium, large
✔✔most commonly used accessory cone sizes - ✔✔fine-fines and medium-fines
✔✔function of sealers - ✔✔acts as interface and adhesive between GP and canal walls
fills in discrepancies and dentinal tubules that GP cannot adapt to fit
gives fluid tight seal
✔✔what obturation technique do we use? - ✔✔lateral condensation
✔✔what types of canals are lateral condensation good for? - ✔✔medium to larger size
canals
✔✔what taper size master cones do we typically use for lateral condensation
obturation? - ✔✔.02 taper
✔✔what are 4 advantages of lateral condensation? - ✔✔-not complicated
-simple armamentarium
-seals like other techniques
-allows for good length control
, ✔✔3 limitations of lateral condensation - ✔✔-curved canals
-open apex cases
-internal resorption defects
✔✔what should the final apical diameter (cone size) be for small canals? -
✔✔#25,30,35
✔✔what should the final apical size be for medium canals? - ✔✔#35,40,45
✔✔what should the final apical size be for large canals? - ✔✔#45, 50 or above
✔✔what are the color-size coordination with finger spreaders? - ✔✔red = small canals
blue = medium canals
green = large canals
✔✔what must be done before lateral condensation can proceed (5)? - ✔✔-middle third
of canal shaped properly
-irrigate and dry canal
-make sure finger spreader seats within 2mm of WL
-select master cone (.02) that matches the last file used in WL
-fit cone to WL with tug back
✔✔what is the purpose of the master cone radiograph? - ✔✔verifies length
✔✔how much of the master cone should have sealer on it? - ✔✔apical 1/3-1/2
✔✔where should burn off be? - ✔✔within 1mm of CEJ
✔✔most common reason for poor lateral condensation - ✔✔inadequate
flaring/instrumentation of the canal
✔✔other common reasons for poor lateral condensation - ✔✔wrong spreader or master
cone or accessory cone size, inadequate pressure with spreader or placement of
accessory cones
✔✔what is the working time of the sealer? - ✔✔30-60 minutes
✔✔how long should you mix sealer for? - ✔✔20-30 seconds
✔✔heat/humidity will ______ working time of sealer - ✔✔shorten
✔✔why do we take the tree shot? - ✔✔to re-verify length control (NOT DENSITY FILL
CHECK)
QUESTIONS AND SOLUTIONS GRADED A+
✔✔what is the crown down technique? - ✔✔start with larger rotary file down to
resistance, irrigate with 10 file to maintain path, move down sizes until reaching FWL
repeat until apical portion is at least #35.04
✔✔how should the MAF fit into the canal? - ✔✔"snug"
✔✔why do we obturate the canal system? - ✔✔to create a fluid tight seal along the
entire length of the canal
✔✔what are the size ranges of master cones? - ✔✔15-140
✔✔what are the taper sizes of master cones? - ✔✔.02,.04.06
✔✔function of accessory cones - ✔✔fill voids/spaces between master cone and the
canal walls
✔✔sizes of accessory cones - ✔✔x-fine, fine-fine, medium-fine, fine, fine-medium,
medium, large
✔✔most commonly used accessory cone sizes - ✔✔fine-fines and medium-fines
✔✔function of sealers - ✔✔acts as interface and adhesive between GP and canal walls
fills in discrepancies and dentinal tubules that GP cannot adapt to fit
gives fluid tight seal
✔✔what obturation technique do we use? - ✔✔lateral condensation
✔✔what types of canals are lateral condensation good for? - ✔✔medium to larger size
canals
✔✔what taper size master cones do we typically use for lateral condensation
obturation? - ✔✔.02 taper
✔✔what are 4 advantages of lateral condensation? - ✔✔-not complicated
-simple armamentarium
-seals like other techniques
-allows for good length control
, ✔✔3 limitations of lateral condensation - ✔✔-curved canals
-open apex cases
-internal resorption defects
✔✔what should the final apical diameter (cone size) be for small canals? -
✔✔#25,30,35
✔✔what should the final apical size be for medium canals? - ✔✔#35,40,45
✔✔what should the final apical size be for large canals? - ✔✔#45, 50 or above
✔✔what are the color-size coordination with finger spreaders? - ✔✔red = small canals
blue = medium canals
green = large canals
✔✔what must be done before lateral condensation can proceed (5)? - ✔✔-middle third
of canal shaped properly
-irrigate and dry canal
-make sure finger spreader seats within 2mm of WL
-select master cone (.02) that matches the last file used in WL
-fit cone to WL with tug back
✔✔what is the purpose of the master cone radiograph? - ✔✔verifies length
✔✔how much of the master cone should have sealer on it? - ✔✔apical 1/3-1/2
✔✔where should burn off be? - ✔✔within 1mm of CEJ
✔✔most common reason for poor lateral condensation - ✔✔inadequate
flaring/instrumentation of the canal
✔✔other common reasons for poor lateral condensation - ✔✔wrong spreader or master
cone or accessory cone size, inadequate pressure with spreader or placement of
accessory cones
✔✔what is the working time of the sealer? - ✔✔30-60 minutes
✔✔how long should you mix sealer for? - ✔✔20-30 seconds
✔✔heat/humidity will ______ working time of sealer - ✔✔shorten
✔✔why do we take the tree shot? - ✔✔to re-verify length control (NOT DENSITY FILL
CHECK)
