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Twin Block Appliance
This functional appliance consists of two bite blocks, upper and lower, which interlock at 70°. Twin Blocks™ are designed so the mandible is held in a protrusive postion. This appliance is ideal in cases with large overjets when the mandible is recessive.
This is a comfortable appliance to wear as patients rarely have problems speaking or eating with the appliance. It can be used in combination with vertical elastics to correct deep overbite.
The activation of the midline screws assist with the transverse development. Since 80% of Class II malocclusions have deficient mandibles, the Twin Block™ is a must for the treatment of the majority of Class II cases for patients under age 11 who are good co-operators.