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
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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
单项选择题
In which of the following techniques may a patient be asked to hold the film packet during exposure
A．bisection of the angle
B． paralleling
C．bitewing
D．occlusal
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