Twin block :Most commonly used for class II correction..
Twin Block appliances are simple bite blocks that are designed for full-time wear. They achieve rapid functional correction of malocclusion by the transmission of favourable occlusal forces to occlusal inclined planes that cover the posterior teeth. The Twin Block appliance can be designed like any other removable orthodontic appliance with a variety of components such as expansion screws, springs and clasps.
Fixed upper and lower bite blocks that are bilateral and connected by palatal and lingual arch respectively interposed at 45 to 60 degree inclined plane Removable upper block with palatal plate and lower block with lingual plate ate interposed at 45 to 60 degree inclination.
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