Standard FMS breakdown?

• A. 6 anterior PAs, 6 posterior PAs, 6 bitewings
• B. 10 anterior PAs, 6 posterior PAs, 2 bitewings
• C. 8 anterior PAs, 8 posterior PAs, 4 bitewings
• D. 8 anterior PAs, 4 posterior PAs, 8 bitewings

Answer: (C)

The question tests how a standard full-mouth series (FMS) is broken down in terms of radiograph counts and types to give complete dental coverage. In the commonly taught standard, there are eight anterior periapicals, eight posterior periapicals, and four bitewings. The eight anterior PAs ensure all front teeth are imaged with clear views of the roots and any pathology. The eight posterior PAs cover the premolars and molars in both arches, providing detailed examination of the back teeth. The four bitewings give proximal views to detect early interproximal caries and to assess bone levels around all teeth. Together, this setup yields twenty films, offering thorough diagnostic information.

Other distributions don’t fit because they either underrepresent certain regions (missing adequate posterior or anterior coverage) or overemphasize bitewings without adding diagnostic value beyond what the periapicals provide.