Which of the followings is connected with the periodontium by the apical foramen?()
A. the root canal
B. the intercanal anastomoses
C. the lateral canal
D. the apical ramification
E. the accessory root canal
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Which of the following descriptions about the pulp cavity of the mandibular first premolar is incorrect?()
A. The mesiodistal diameter of the pulp chamber is greater than its buccolingual diameter, and the buccolingual diameter is greater than the height of the pulp chamber.
B. The roof of the pulp chamber is concave, and the lowest part is level with the cervical margin.
C. The height of the lingual pulp horn is close to the middle third of the dental crown.
D. The buccal and distal pulp horns are relatively low, which are located at about the cervical third of the crown or near the cervical margin.
E. About 13% of the mesial root canals are double canal type.
Abnormal dentition does not include()
A. the crowded dentition
B. the interdental spacing
C. the supraversion
D. the infraversion
E. the teeth outside dental arch
The curve that connect the buccal and lingual cusps of the bilateral corresponding molars is called()
A. the sagittal curve of occlusion
B. the transverse curve of occlusion
C. the compensating curve
D. the curve of Spee
E. the occlusal plane
Which of the following descriptions about the relationships of the mesial occlusion is correct?()
A. The mesial buccal cusp of the maxillary first molar is distal to the buccal groove of the mandibular first molar.
B. The mesial buccal cusp of the maxillary first molar is opposite to the buccal groove of the mandibular first molar.
C. The mesial buccal cusp of the maxillary first molar is mesial to the buccal groove of the mandibular first molar.
D. There is mandibular retrognathia.
E. There is normal mandibular facial type.
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