ENDO OSCE FINAL EXAM ACTUAL QUESTIONS AND
SOLUTIONS GRADED A+
✔✔older patient tooth and pulp - ✔✔restorations, calcification in pulp chamber, hard to
see pulp horns sometimes
✔✔Access shape of maxillary molars - ✔✔triangular
✔✔access shape of mandibular molars - ✔✔trapezoidal or rhomboid
✔✔about ____% of maxillary first molars have 4 canals with the 4th one being _____ -
✔✔90%, MB2
✔✔MB2 is less predominant in _____ molar but still there - ✔✔second
✔✔taper of vortex blue rotary files - ✔✔.04
✔✔taper of gutta percha cone - ✔✔.02
✔✔mechanical objective of cleaning and shaping - ✔✔-prep/enlarge/clean all root canal
surface
-provide space for fill
-retain cervical and radicular dentin while maintaining canal shape
✔✔biological objectives of cleaning and shaping - ✔✔optimal disinfection
✔✔4 things degree of shaping depends on - ✔✔-tooth anatomy
-restorative txp
-pre op root dimensions
-obturation technique
✔✔stainless steel hand files properties (4) - ✔✔-carbon, iron, nickel
-more stiff/less flexible
-no shape memory
-straightens and transport canal
✔✔NiTi rotary files - ✔✔55% nickel, 45% titanium
super elasticity with shape memory
conforms to canal anatomy
✔✔purple file size - ✔✔10
✔✔grey file size - ✔✔8
, ✔✔pink file size - ✔✔6
✔✔white file sizes - ✔✔15,45,90
✔✔yellow file size - ✔✔20,50,100
✔✔red file size - ✔✔25, 55, 110
✔✔blue file size - ✔✔30, 60, 120
✔✔green file size - ✔✔35, 70, 130
✔✔black file size - ✔✔40, 80, 140
✔✔length of rotation portion of hand files - ✔✔16mm
✔✔diameter of files - ✔✔0.25mm
✔✔number of step/flutes on hand file - ✔✔16 (D0-D16)
✔✔length options of hand files - ✔✔21mm, 25mm, 31mm
✔✔What does the # represent in hand files? - ✔✔the starting diameter at the tip (D0)
✔✔what part of the canal has the smallest diameter? - ✔✔minor foramen/apical
constriction
✔✔where is the apical foramen? - ✔✔offset 0.5-3mm from anatomic apex
✔✔why do we subtract 1mm from the measure of the tooth on the x ray? - ✔✔to
account for radiographic distortion
✔✔how do we calculate EWL? - ✔✔measure of the tooth on x ray minus 1 mm
✔✔what is the length of the patency file? - ✔✔FWL + 1mm
✔✔what file do you use to determine final working length? - ✔✔#15 file
✔✔what is a small k file? - ✔✔#10 file extended beyond apical foramen
✔✔what are the 3 functions of the patency file? - ✔✔-remove accumulated debris
-help maintain WL
-greater clinical success
SOLUTIONS GRADED A+
✔✔older patient tooth and pulp - ✔✔restorations, calcification in pulp chamber, hard to
see pulp horns sometimes
✔✔Access shape of maxillary molars - ✔✔triangular
✔✔access shape of mandibular molars - ✔✔trapezoidal or rhomboid
✔✔about ____% of maxillary first molars have 4 canals with the 4th one being _____ -
✔✔90%, MB2
✔✔MB2 is less predominant in _____ molar but still there - ✔✔second
✔✔taper of vortex blue rotary files - ✔✔.04
✔✔taper of gutta percha cone - ✔✔.02
✔✔mechanical objective of cleaning and shaping - ✔✔-prep/enlarge/clean all root canal
surface
-provide space for fill
-retain cervical and radicular dentin while maintaining canal shape
✔✔biological objectives of cleaning and shaping - ✔✔optimal disinfection
✔✔4 things degree of shaping depends on - ✔✔-tooth anatomy
-restorative txp
-pre op root dimensions
-obturation technique
✔✔stainless steel hand files properties (4) - ✔✔-carbon, iron, nickel
-more stiff/less flexible
-no shape memory
-straightens and transport canal
✔✔NiTi rotary files - ✔✔55% nickel, 45% titanium
super elasticity with shape memory
conforms to canal anatomy
✔✔purple file size - ✔✔10
✔✔grey file size - ✔✔8
, ✔✔pink file size - ✔✔6
✔✔white file sizes - ✔✔15,45,90
✔✔yellow file size - ✔✔20,50,100
✔✔red file size - ✔✔25, 55, 110
✔✔blue file size - ✔✔30, 60, 120
✔✔green file size - ✔✔35, 70, 130
✔✔black file size - ✔✔40, 80, 140
✔✔length of rotation portion of hand files - ✔✔16mm
✔✔diameter of files - ✔✔0.25mm
✔✔number of step/flutes on hand file - ✔✔16 (D0-D16)
✔✔length options of hand files - ✔✔21mm, 25mm, 31mm
✔✔What does the # represent in hand files? - ✔✔the starting diameter at the tip (D0)
✔✔what part of the canal has the smallest diameter? - ✔✔minor foramen/apical
constriction
✔✔where is the apical foramen? - ✔✔offset 0.5-3mm from anatomic apex
✔✔why do we subtract 1mm from the measure of the tooth on the x ray? - ✔✔to
account for radiographic distortion
✔✔how do we calculate EWL? - ✔✔measure of the tooth on x ray minus 1 mm
✔✔what is the length of the patency file? - ✔✔FWL + 1mm
✔✔what file do you use to determine final working length? - ✔✔#15 file
✔✔what is a small k file? - ✔✔#10 file extended beyond apical foramen
✔✔what are the 3 functions of the patency file? - ✔✔-remove accumulated debris
-help maintain WL
-greater clinical success
