牙尖交错牙合时上下颌牙齿成一对二交叉咬合关系,例外者是:( )
A. 下颌中切牙与上颌第三磨牙
B. 上颌中切牙与下颌第三磨牙
C. 上颌侧切牙与下颌第三磨牙
D. 上颌尖牙与下颌第三磨牙
E. 没有例外,都是一对二的交叉咬合关系
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When the mandible is in intercuspal occlusion, there is one to two intersection relationship of the maxillary and mandibular teeth with the exception of ()
A. mandibular central incisors and maxillary third molars
B. maxillary central incisors and mandibular third molars
C. maxillary lateral incisors and mandibular third molars
D. maxillary canines and mandibular third molars
E. There is no exception
When the mandible is in resting position, the wedge-shaped gap formed by maxillary and mandibular detention is called ()
A. the interproximal space
B. freeway space
C. The occlusal height
D. The inter-arch distance
E. The vertical dimension
As for the retruded contact position, which one is NOT correct? ()
A. From the intercuspal position, the mandible slightly moves backwards and downwards for about 1 mm.
B. It is found in everyone.
C. The slopes of the posterior teeth cusps are in partial contact.
D. The condyle is at the rearmost of the mandibular fossa.
E. It is the physiological rearmost mandibular position.
As for the mandibular postural position, which one is NOT correct? ()
A. It is the mandibular resting position.
B. It is stable and repeatable.
C. It refers to the mandibular position when a person stands or sits in an upright posture, looking straight ahead, and there is no chewing, no swallowing, and no speaking. What’s more, the mandibular teeth do not contact the maxillary teeth.
D. There is a 1-3 mm gap between maxillary and mandibular incisors.
E. There is no electrical activity of the mandibular elevating muscles.
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