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
Which of the following projections images the crowns of both maxillary and mandibular teeth on the same film and is helpful in diagnosing interproximal dental caries
A． panoramic
B． periapical
C．bitewing
D．occlusal
单项选择题
Which one of the following anatomy should not appear on the periapical radiograph of the lower central incisor
A．genial tubercles
B． mental foramen
C． nutrient canals
D．inferior border of the mandible
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