Before the age of 4, all of the following statements are the characteristics of deciduous occlusion except()
A. closely aligned teeth.
B. no gap.
C. straight crowns.
D. no obvious curve of occlusion.
E. temporary crossbite.
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During 4-6 years old, the occlusal characteristics of deciduous teeth are()
A. The primate space appears.
B. The incisal edge and occlusal surface of the teeth show attrition.
C. The proximal surfaces of the deciduous second molars on both jaws are not in the same plane, and the mandibular second molar moves to the mesial of the maxillary second molar.
D. With the development of mandibular ramus, the temporary deep overbite may decrease.
When the dentition is missing, which of the following can determine the occlusal plane? ()
A. the ala-tragus line
B. the Frankfort plane
C. the transverse curve of occlusion
D. the curve of Spee
The apex of Bonwill triangle is located in the center of each condylar process and the mesial contact point of mandibular central incisor. ( )
1 0:09:48 single-choice question Which of the following cusps is the closest to the floor of the maxillary sinus ()
A. Maxillary first molar
B. Maxillary second molar
C. Maxillary third molar
D. Maxillary second premolar
E. From maxillary second premolar to maxillary third molar
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