How to decide whether the mandibular central incisor is the left or the right one? ()
A. The mesial incisal angle is nearly right-angle
B. The mesial contact area is closer to the incisal angle
C. The distal incisal angle is an obtuse angle
D. The distal contact area is far from the incisal angle
E. The elongated depression on the distal surface of the root is deeper than that of the mesial surface of the root
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Which of the following statements about the dentin is/are incorrect: ()
A. It is softer than the enamel.
B. It is beneath the enamel and cementum.
C. It is white and transparent.
D. It surrounds the pulp cavity.
E. It makes up the bulk of the tooth.
The tooth that can be extracted by the rotating force is the ()
A. The maxillary central incisor
B. The mandibular central incisor
C. The maxillary lateral incisor
D. The mandibular lateral incisor
E. The premolar
Which tooth has the developmental grooves shaped like a cross?()
A. The maxillary first molar
B. The mandibular first molar
C. The maxillary second molar
D. The mandibular second molar
E. The mandibular second premolar
Which of the following descriptions about the mandibular canine is incorrect: ()
A. Its root is oblate and slender
B. There is the shallow and elongated depression on the distal surface of the root
C. The length of the distal slope of the cusp is twice as long as the length of the mesial slope
D. the angle of intersection of the mesial and the distal slopes is greater than 90 degrees
E. it can be extracted by the rotating force
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