Which appliance is described as exerting pressure on the teeth to move the jaw forward?

Which appliance is described as exerting pressure on the teeth to move the jaw forward?

• A. Bionator
• B. Twin Block
• C. Frankel Appliance
• D. Activator

Answer: (B)

Functional appliances that aim to correct Class II malocclusion work by encouraging the lower jaw to posture forward, and the way they accomplish this is by delivering forces through the teeth to guide the mandible’s position. The Twin Block does this with two opposing acrylic blocks placed on the upper and lower teeth. Their inclined planes interact when the patient bites, so the mandible is guided forward into a forward-positioned bite. That bite creates continuous anterior forces via the contact between the blocks and the teeth, pushing the jaw forward and promoting favorable dental and skeletal changes as the patient grows. Other appliances may rely more on soft-tissue guidance or different biomechanics, but the Twin Block’s design specifically uses the tooth contacts to drive forward mandibular positioning, which is why it’s described as exerting pressure on the teeth to move the jaw forward.

Functional appliances that aim to correct Class II malocclusion work by encouraging the lower jaw to posture forward, and the way they accomplish this is by delivering forces through the teeth to guide the mandible’s position. The Twin Block does this with two opposing acrylic blocks placed on the upper and lower teeth. Their inclined planes interact when the patient bites, so the mandible is guided forward into a forward-positioned bite. That bite creates continuous anterior forces via the contact between the blocks and the teeth, pushing the jaw forward and promoting favorable dental and skeletal changes as the patient grows.

Other appliances may rely more on soft-tissue guidance or different biomechanics, but the Twin Block’s design specifically uses the tooth contacts to drive forward mandibular positioning, which is why it’s described as exerting pressure on the teeth to move the jaw forward.