Which of the following descriptions about the pulp cavity of the mandibular first premolars is incorrect
A. The mesiodistal diameter of the pulp chamber is larger than the buccolingual diameter, and the buccolingual diameter is larger than the height of the pulp chamber.
B. The roof of the pulp chamber is concave. The bottom of the concavity is nearly at level with the cervical margin.
C. The height of the lingual pulp horn nearly reaches the middle third of the crown.
D. The pulp horns of buccal cusps and distal cusp are relatively low, and are located at cervical third of the crown or near the cervical line.
E. The double-root canals account for 13% among the mesial root canals.
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Among the premolars, which of the following teeth has the highest proportion of having double root canals
A. Maxillary first premolar
B. Maxillary second premolar
C. Mandibular first premolar
D. Mandibular second premolar
Which of the following teeth has five cusps on the occlusal surface? ()
A. The maxillary first molar.
B. The maxillary second molar.
C. The maxillary third molar.
D. The mandibular first molar.
E. None of the above.
The malformed central cusp is often found in_______. ()
A. maxillary first premolar
B. maxillary second premolar
C. mandibular first premolar
D. mandibular second premolars
E. the first molar
The "six-year molars" refer to_______. ()
A. the incisors
B. the canines
C. the premolars
D. the first molars
E. none of the above
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