Which of the following statements about the anatomical occlusal plane is correct()
A. It is an imaginary plane that connects the mesial approximal point of the mandibular central incisors to the distal buccal cusps of bilateral first molars.
B. It is an imaginary plane that connects the mesial approximal point of the maxillary central incisors to the distal buccal cusps of the bilateral first molars.
C. It is an imaginary plane that connects the mesial approximal point of the mandibular central incisors to the distal buccal cusps of the bilateral last molars.
D. It is an imaginary plane that connects the mesial approximal point of the maxillary central incisors to the distal buccal cusps of bilateral last molars.
E. None of the above is correct.
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Which of the following statements about the curve of Spee is correct()
A. It is the sagittal curve of occlusion of the maxilla.
B. It is the sagittal curve of occlusion of the mandible.
C. It is the transverse curve of occlusion of the maxilla.
D. It is the transverse curve of occlusion of the mandible
E. None of the above is correct.
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.
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.
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