Dental Assistant Practice Exam

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How many total X-rays are taken in an FMX?

16 X-rays
18 X-rays
20 X-rays
22 X-rays

The correct answer is: 18 X-rays

An FMX, or full mouth series, typically consists of a specific number of individual radiographs that capture all the teeth and surrounding structures. The total usually includes a combination of periapical films and bitewing films. While the most common number for an FMX is 18 X-rays, which includes 14 periapical X-rays and 4 bitewings, variations can occur based on different protocols used by dental practices or specific patient needs. In standard practice, 18 X-rays provide comprehensive coverage for visualizing all teeth, both anterior and posterior, as well as supporting the evaluation of potential dental issues like cavities, bone loss, or other abnormalities throughout the mouth. This total aids in thorough diagnostic assessments by ensuring each quadrant of the mouth is adequately imaged. Therefore, the answer of 18 X-rays accurately reflects the common protocol for an FMX series in dental practices.