What size film is typically used for periapical (PA) radiographs in adults?

The typical size of film used for periapical (PA) radiographs in adults is size 2. This size is specifically designed to capture the full image of the tooth from the crown to the root, including the surrounding bone structures. Size 2 films provide adequate coverage for adult dentition and are versatile enough to be used for various intraoral radiography, including periapical and bitewing views.

In clinical practice, size 2 films allow for optimal image quality while accommodating the larger anatomy of adult teeth compared to smaller film sizes. This is particularly important for diagnosing conditions related to the roots of the teeth and the surrounding structures, where precise detail is crucial for effective treatment planning.