ENDODONTICS EXAM ‘A’
Question (1): Enumerate with drawings different types of root canals.
(5 marks)
Question (2): Enumerate with drawings root canal systems.
(5 marks)
Question (3): State True or False
(10 marks)
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H-file cuts dentin more efficiently than K-file ( ).
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File size 25 is blue in colour ( ).
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Nickel Titanium material has high modulus of elasticity ( ).
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Flex-O-file has triangular cross section ( ).
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K-file is more flexible than K-reamer ( ).
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Golden medium system offers intermediate sizes between ISO files ( ).
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Ultrasonic instruments are ideal tools for canal shaping ( ).
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Ledge formation results from using non-flexible instruments in curved canals ( ).
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Cutting 1mm from tip of file no 10 will generate file no 12 ( ).
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Dangerous zone area of minimal dentin thickness in molars is located toward the furcation area ( ).
Question (4): Choose the correct answer.
(30 marks)
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Apical third root cross section of upper central incisor is:
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Round
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Oval
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triangular
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ovoid
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The longest tooth in the arch is:
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Upper central incisor
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Lower canine
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Upper first molar
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Upper canine
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Cavity outline form in molars is located:
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in mesial half
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in distal half
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in the center of the tooth
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shifted lingually
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Maxillary premolar contains:
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1 pulp horn
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2 pulp horns
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3 pulp horns
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4 pulp horns
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Indications of endodontic therapy include:
a) Insufficient periodontal support
b) Non-strategic tooth
c) Vertical fracture
d) None of the above
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From the mesial view of maxillary central incisor we can see :
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Wide pulp chamber with 3 pulp horns
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Pulp chamber is pointed incisally and widen cervically
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Triangular in shape with the base towards the labial and apex towards the palatal
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b&c
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The root canal system configuration is always type I except in :
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Maxillary central incisor
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Maxillary canine
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Maxillary lateral incisor
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Mandibular central incisor
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Cross section in the root cervical third of maxillary canine is :
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Oval
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Triangular
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Trapezoid
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Rhomboid
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70% of maxillary first premolar root canal configuration is:
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Type I
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Type II
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Type III
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Type IV
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Maxillary first molar may contain an extra canal called :
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MB2
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D2
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P2
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DB2
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Convenience form depends on :
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Size of the pulp chamber
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Shape of the pulp chamber
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Number of root canals
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All of the above
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None of the above
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Base of the triangle-shaped access cavity preparation of maxillary molars lies:
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Mesially
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Buccally
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Distally
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Palatally
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The coronal pulp is formed of :
a) Pulp chamber and root canal
b) Pulp chamber and pulp horns
c) Pulp chamber and accessory canals
d) Root canal and accessory canals
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The basic phases of endodontic therapy include all of the following except :
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Diagnostic
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Preparatory
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Irrigation of the cavity
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Obliteration
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Endodontics is a branch of dentistry concerned with:
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Pulp diseases.
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Periapical diseases.
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Pulp and periapical diseases.
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Pain due to pulp injury.
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Outline form of mandibular premolars is:
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Round
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Ovoid
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Oval
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Triangular
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Pulp chamber of upper central incisor is :
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Wider in buccolingual dimension.
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Wider in mesiodistal dimension.
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Has two pulp horns.
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oval in shape.
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Diagnostic materials and devices include:
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Vitality testing.
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Tooth slooth.
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Radiography.
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Visual aids.
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All of the above.
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Instruments for access cavity preparation include:
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Burs.
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Exploring instruments.
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Barbed broach.
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a& b.
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None of the above.
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Barbed broach is used for:
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Exploring canals orifices.
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Enlarging root canals.
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Extirpating pulp tissue.
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Determination of the tooth length.
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K File is:
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Fabricated by twisting counter clock wise.
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Square in cross section.
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Used in filing and reaming action.
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All of the above.
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Which of the following is true for K Reamer:
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Used for reaming only.
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Used for filing and reaming.
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Has square cross section.
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Is fabricated by machine grinding.
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H File is:
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Fabricated by machining (grinding).
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Used for filing only.
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Triangular in cross section
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All of the above
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a & b
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Flexibility is increased by:
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Decreasing the cross section.
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Decreasing the length.
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Increasing the length.
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increasing the cross section.
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a&c
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b&d
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The most flexible instruments are :
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Nickel-titanium instruments.
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Stainless steel instruments.
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Carbon steel instruments.
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a& c only.
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According to ISO standardization the length of the cutting part is:
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0.02 mm.
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21 mm.
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0.32 mm.
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16 mm.
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According to ISO standardization all the following is right except:
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Taper is 0.02 mm/mm.
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Tip design is 75 ± 15 degrees.
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Linear increase in D0 by 0.05 mm from #15 to 60.
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D16=D0+ 0.21 mm.
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Number 15 on the handle of file indicates that:
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The increase in diameter from D0 to D16 is 0.15 mm.
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The length from D1 to D16 is 15 mm.
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Diameter at D0 =0.15 mm.
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The length from the working tip to the file handle is 15 mm.
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Removal of pulp horn is necessary to avoid:
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Missing canal
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Ledge and perforation
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Discoloration
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All of the above
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Cross section of K-flex file is:
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Rhomboid
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Triangular
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Round
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Square
Model Answer
Question (3): State True or False
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( True)
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( False )
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( False )
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( True)
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( False)
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(True)
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(False)
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(True)
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(True )
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(True )
Question (4): Choose the correct answer.
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A
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D
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A
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B
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D
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B
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D
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A
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A
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A
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E
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B
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B
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C
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C
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B
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B
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E
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D
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C
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D
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A
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E
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F
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A
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D
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D
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C
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C
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A
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