Twin Block Appliance

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A twin block is an orthodontic appliance.[1] whose purpose is to lengthen the lower jaw by posturing it forward. If the jaw is growing during treatment, it naturally grows at a faster rate; otherwise the appliance is useless. Treatment time varies, but is generally around 9 months. Twin Blocks can also be used to cure an overbite, which can mean treatment may be slightly longer. If this is the case, treatment can vary from 6 to 11 months.[2]


  1. ^ William J. Clark (2002), Twin Block Functional Therapy: Applications in Dentofacial Orthopaedics, Mosby, ISBN 978-0-7234-3170-1 
  2. ^ Textbook of Orthodontics, Jaypee Brothers Publishers, 1 December 2008, pp. 530–, ISBN 978-81-8448-080-1