Periapical radiographs are most useful for evaluating

• A. Root apices and surrounding structures
• B. Caries on occlusal surfaces
• C. Sinuses
• D. Jaw shape

Answer: (A)

Periapical radiographs focus on the tip of the tooth root and the surrounding bone, giving a clear view of the periapical tissues. This makes them the best choice for assessing endodontic status and pathology—such as periapical radiolucencies from infection, changes in the periodontal ligament space, root fractures, resorption, and the overall integrity of the root canal system and surrounding bone. They’re also helpful for judging root length and the relationship of the tooth to adjacent structures. In contrast, detecting caries on occlusal surfaces is better done with bitewing radiographs, which are designed to visualize enamel and dentin interfaces on chewing surfaces. Evaluating sinuses or overall jaw shape requires different views (such as panoramic, Waters, or CT) that capture larger areas and provide better detail of those structures.