IntroductIon Every orthodontist at some point in his clinical practice has faced the dilemma of how "best" to manage class II malocclusion, which is by far one of the most common type of malocclusions encountered. Aetiology of class II malocclusion may be due to heredity, abnormal intrauterine foetal pressure, birth injury, and traumatic injury to mandible or TMJ. It may be a dental class II or have a skeletal component. 1-4 Skeletal class II jaw relation may be due to a prognathic maxilla,

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... ognathic mandible, or a combination of both. Mandibular retrognathism may be due to small mandible, posterior placement of condyle in glenoid fossa or a functional retrusion. Management of class II malocclusion depends entirely upon the severity of the problem and the age at which it presents for treatment. Numerous orthodontic techniques and appliances have been introduced to treat the same. Correction of skeletal class II malocclusion by growth modulation during active growth can be achieved using various myofunctional appliances like activator, Frankel's regulator and the twin block. Out of the array of the removable functional appliances available, "the Standard Twin Block appliance" is preferred by many clinicians due to the ease of use by the patient and ease of management of the appliance. It was first introduced by Clark in 19,886 and consists of two separate, upper and lower, removable plates with acrylic blocks trimmed to an angle of 70°. These separate plates make the twin block appliance different in comparison with other removable functional appliances, which are basically monoblocks. 5,6 Theoretically, this plus a less bulky appearance would increase patient acceptance of the appliance. Patients would also have more freedom in their mandibular movements.