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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单项选择题
Which of the following is considered to be an extraoral technique
A．bitewing
B．panoramic
C．paralleling
D．occlusal
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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