Which is connected to the periodontium via the lateral accessory foramina? ()
A. The root canal
B. The accessory root canal
C. The lateral canal
D. The intercanal anastomoses
E. The apical ramification
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The deciduous maxillary central incisor is single-rooted, and the ratio of its root length to its crown length is ().
A. 1:1
B. 1:2
C. 1:3
D. 2:1
E. 3:1
The mixed dentition period shows at ()
A. the age of 2~6
B. the age of 2.5~6
C. the age of 6~12
D. the age of 9~12
E. the age of 6~15
The correct description about the transverse curve of occlusion is ()
A. it is located on the maxilla
B. it is located on the mandible
C. it is located on both the maxilla and the mandible
D. it is a downward convex curve that connects the cusps of canines on the both sides
E. none of the above
The function of masticatory movement can be divided into three stages: ()
A. Protruding, retruding and lateral movements.
B. Cutting, crushing, and grinding movements.
C. Front and back, opening and closing, and lateral movements.
D. Mouth opening, food locating, and chewing movements.
E. Centric occlusion, small open bite occlusion, and return to centric occlusion.
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