Bionator is described as a cut down activator with an interocclusal shelf and incisor capping if desired.

• A. Cut down activator with an interocclusal shelf and incisor capping if desired
• B. Fully covers the teeth of both arches
• C. A fixed posterior crossbite appliance
• D. A clear aligner system

Answer: (A)

The Bionator is a modified activator designed to be less bulky and easier for the patient to wear, achieved by a cut-down design that does not fully cover both arches. Its interocclusal shelf serves as a bite plane or stop that guides vertical dimension and helps the mandible sit forward in a functional position, while still allowing some anterior contact and natural tongue rest. Incisor capping, if used, provides protection to the incisal edges and can help tailor incisal guidance and vertical control. Together, these features describe the classic Bionator: a trimmed activator with an interocclusal shelf and optional incisor capping.