MCQs in Endodontics - Anatomy of Pulp Canal


# What percentage of mandibular first molars have two distal canals?
A. 10 %
B. 30 %
C. 60 %
D. 75 %

# Two canals are most often seen in the:
A. Maxillary canine
B. Mandibular canine
C. Maxillary lateral incisors
D. Mandibular first premolar


# The mandibular molars generally have:
A. Two roots and two canals
B. Two roots and three canals
C. Three roots and two canals
D. None of the above

# The fourth root canal if present in a maxillary first molar is usually present in:
A. Mesolingual root
B. Mesiobuccal root
C. Palatal root
D. Distal root

# Cervical cross section of maxillary first premolar has:
A. Round shape
B. Elliptical shape
C. Oval shape
D. Square shape

# Of the following permanent teeth, which is least likely to have two roots?
A. Maxillary canine
B. Mandibular canine
C. Maxillary first premolar
D. Mandibular first premolar

# Accessory canals are most frequently found in:
A. the cervical third of the root
B. the middle third of the root
C. the apical third of the root
D. With equal frequency in all thirds

# There are sharp demarcations between pulpal chambers and pulp canals in which of the following teeth?
A. Mandibular second premolars
B. Maxillary first premolars
C. Maxillary lateral incisors
D. Mandibular canines

# In the mandibular arch, the greatest lingual inclination of the crown from its root is seen in the permanent:
A. canine
B. third molar
C. first premolar
D. central incisor

# The mesiolingual root canal of the mandibular first molar is found under the:
A. Mesiolingual cusp
B. Mesiobuccal cusp
C. Central groove
D. Mesiolingual ridge

# The orifice of the fourth canal in a maxillary molar is usually found:
A. under the distofacial cusp
B. Lingual to the orifice of the mesiofacial canal
C. on a line running from the distofacial orifice to the mesiofacial orifice
D. On a line running from the lingual orifice to the distofacial orifice

# A divided pulp canal is most likely to occur in the:
A. Root of a maxillary canine
B. Root of a mandibular canine
C. Root of a maxillary central incisor
D. Lingual root of a maxillary first molar

# If the pulp of the single rooted canal is triangular in cross section with the base of the triangle located facially and apex located lingually with the mesial arm longer than the distal, the tooth is most likely:
A. Maxillary central incisor
B. Maxillary lateral incisor
C. Mandibular second premolar
D. Mandibular central incisor

# Considering the morphology of root and pulp canals, a root canal instrument should be placed in what direction to gain access to the mesiofacial root of permanent maxillary first molar?
A. From the mesiobuccal
B. From the distobuccal
C. From the mesiolingual
D. From the distolingual

# Mandibular first molar has:
A. 2 roots and 2 canals
B. 2 roots and 3 canals
C. 3 roots and 3 canals
D. 3 roots and 4 canals

# In which anterior tooth are bifurcated roots present?
A. Mandibular lateral incisor
B. Maxillary canine
C. Mandibular central incisor
D. Mandibular premolar

# Which of the following has the largest relative mesiodistal dimension of the root canal?
A. maxillary lateral incisor
B. Mandibular second premolar
C. Palatal root of maxillary first molar
D. Distal root of mandibular first molar

# Which root canal is most difficult to prepare in maxillary molar?
A. Mesiobuccal
B. Distobuccal
C. Palatal
D. Both A and B

# The tooth most commonly having bifurcated roots is the:
A. Maxillary central incisor
B. Mandibular lateral incisor
C. Mandibular central incisor
D. Mandibular premolar

# The most easily perforated tooth with a slight mesial or distal angulation of bur after a mandibular central incisor is:
A. Maxillary premolar
B. Maxillary molar
C. Mandibular premolar
D. Maxillary canine

# A cross section of the cervical third of the pulp canal of a maxillary second premolar resembles shape of:
A. a circle
B. a square
C. a triangle
D. an ellipse

# Four canals are seen in:
A. Upper first molar
B. Lower first molar
C. Upper second molar
D. Lower second molar

# The root canals most likely to share a common apical opening are:
A. Mesial and distal roots of mandibular premolars
B. Mesiobuccal and mesiolingual roots of mandibular first molars
C. Both A and B
D. None of the above

# Branching of pulpal canals is least likely seen in:
A. Maxillary central incisor
B. Upper first premolar
C. Mandibular central incisor
D. Mandibular lateral incisor

# The anterior tooth most likely to display two canals is:
A. Maxillary central
B. Maxillary lateral
C. Mandibular central
D. Mandibular lateral

# The tooth which usually has the largest pulp chamber in the mouth is the:
A. Maxillary central
B. Maxillary canine
C. Maxillary first molar
D. Mandibular first molar

# Incidence of third root in upper first premolar is:
A. 6 %
B. 10 %
C. 12 %
D. 1 %

# Percentage of distal root with two root canals in mandibular molar:
A. 10 %
B. 30 %
C. 60 %
D. 1 %

# Access cavity shape in mandibular first molar with four canals is:
A. Trapezoidal
B. Round
C. Oval
D. Triangular

# Apical constriction is also known as:
A. Minor diameter
B. Major diameter
C. Radiographic apex
D. Tooth apex

# Bifurcations and trifurcations are most commonly observed in:
A. Maxillary first premolar
B. Maxillary second premolar
C. Mandibular first premolar
D. Mandibular second premolar

# In anterior teeth, the starting location for access cavity is the center of the anatomic crown on lingual surface at:
A. Angle to it
B. In line to it
C. Perpendicular to it
D. All of the above

# Most common chances of pulpal exposure will be there if pulpal floor is made perpendicular to the long axis of tooth:
A. Maxillary first premolar
B. Maxillary first molar
C. Mandibular first premolar
D. Mandibular second premolar

# The access cavity for mandibular first molar typically is:
A. Trapezoid
B. Triangular
C. Oval
D. Round

# Incidence of 2 canals in mandibular incisors is:
A. 3-12 %
B. 12-20 %
C. 20-41 %
D. Less than 3 %

# Which of the following is likely to have bifurcated roots?
A. Mandibular canine
B. Maxillary canine
C. Mandibular incisor
D. Maxillary incisor

# The objective of the access cavity preparation is to gain direct access to:
A. Pulp chamber
B. Canal orifice
C. Apical foramen
D. Middle third of the canal

# Which of the following is generally the longest root canal on the maxillary first molar?
A. Mesiobuccal
B. Distobuccal
C. Palatal
D. Distolingual