Which of the following descriptions of normal signs of the intercuspal occlusion is incorrect()
A. Each tooth is in contact with two teeth on the opposite jaw.
B. The relationship of canines is normal.
C. The relationship of first molars is neutral.
D. The overbite and overjet relationships of anterior and posterior teeth are normal.
E. The midline of the upper and lower dentition is aligned with the frenulum of the upper lip.
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Which of the following statements about the relationship of the mesial occlusion is correct()
A. The mesiobuccal cusp of the maxillary first molar is located at the distal to the buccal groove of the mandibular first molar
B. The mesiobuccal cusp of the maxillary first molar is opposite to the buccal groove of the mandibular first molar
C. The mesiobuccal cusp of the maxillary first molar is located at the mesial to the buccal groove of the mandibular first molar
D. The mandible appears retruded/The appearance of mandibular retrusion
E. The mandible appears normal
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.
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
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