Which size film is typically used to take a bitewing radiograph on a three-year-old?

The typical size film used to take a bitewing radiograph on a three-year-old is size 0. This size is specifically designed for pediatric patients because it is smaller and accommodates the anatomy of younger children better than larger film sizes. In pediatric dentistry, using the appropriate film size ensures that the image captures the necessary detail while fitting comfortably in a child's mouth. Size 0 is ideal for capturing the crowns of primary molars and detecting interproximal caries, which is particularly important in young children who may have tight contacts between teeth.

While other sizes, like size 1 or size 2, may be used for different age groups or situations, they do not fit the oral cavity of a small child as well as size 0. Size 2 is usually reserved for older children or adults as it can be too large for very young patients and may not provide the best results for diagnostic purposes. Hence, size 0 is the correct choice for ensuring accurate and comfortable radiographic assessments for three-year-olds.