How many images comprise a full mouth radiographic series (FMX)?

A full mouth radiographic series (FMX) typically comprises 18 to 20 images, depending on the specific technique and the dental practice's preferred method. The FMX is designed to provide comprehensive coverage of all teeth and surrounding structures, including both bitewing and periapical radiographs.

In an FMX, bitewing images capture the upper and lower back teeth in one image, which usually accounts for 4 images in total, while periapical images capture the detailed position of each tooth and its root structure, contributing additional images to the series. This combination ensures that the dentist has a complete view of the patient's dental anatomy for accurate diagnosis and treatment planning.

The choice indicating 20 images is accurate as it reflects the common practice of including a sufficient number of both type of radiographs needed to assess dental conditions thoroughly.