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Obstructive sleep apnea (OSA) is a common disorder that is characterized by recurrent upper airway obstruction during sleep. OSA is a widely prevalent problem with significant medical, psychological, and social consequences. Obstruction may involve awakening under the effect of increased effort and a reduction (hypopnea) or complete cessation (apnea) of airflow in the presence of respiratory movements. Sleep apnea is recognized by a combination of symptoms and laboratory results.

The value of an attractive smile is undeniable. A smile is considered the universal friendly greeting in all cultures. An attractive smile in modern society is often considered an asset in interviews, work settings, social interactions, and even the quest to attract a mate. A sound knowledge of orthodontic mechanics and growth changesas well as the principles of cosmetic dentistry should help the orthodontist to truly live up to the epithet of "Smile Architect".

Treatment of Class III malocclusion is a challenge to orthodontist because it is a difficult malocclusion to understand. Management of Adult Class III Cases is an effort to understand the adult Class III malocclusion with respect to its etiology, classification, characteristics features, various diagnostic parameters, clinical examination, cephalometric characteristics and various treatment options available for treatment of this complex malocclusion.