单项选择题

Which of the following is considered to be an extraoral technique

A．bitewing
B．panoramic
C．paralleling
D．occlusal
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单项选择题
Which one of the following may appear on a periapical radiograph of the upper third molar area
A．external oblique ridge
B．mylohyoid ridge
C．coronoid process
D．condyle
单项选择题
Interproximal (bitewing) radiographs are most sensitive in detecting caries on which tooth surface
A． occlusal
B． proximal
C．buccal
D．lingual
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