DOI: 10.36347/sjds.2018.v05i01.004

Pages: 21-27

Twin-block appliance, described by Clark in 1982, is one of the most popular functional appliance .Recent evidence suggest that it may also be considered the most successful in the treatment of II, division 1 malocclusion. The goal of twin block therapy was to produce a technique that could maximize the growth response to functional mandibular protrusion by using an appliance system that is simple, comfortable and aesthetically acceptable to the patients. Conventional twin-block appliances would have required several reactivations by chairside addition of acrylic or by laboratory reconstruction. Modification of the twin block allowed chairside reactivations with minimal inconvenience to staff and patient. This review article cover and update the knowledge about the various modifications of the standard twin block appliances.