Orthognathic Quality of Life Questionnaire (OQLiQ)

The Orthognathic Quality of Life Questionnaire (OQLiQ) is a 22-item, condition-specific instrument measuring quality of life in patients with dentofacial deformity (severe malocclusion, skeletal asymmetry) before and after orthognathic surgery (surgical correction of jaw and bite discrepancies). Developed by Cunningham and colleagues in 2000, the OQLiQ captures impacts specific to severe malocclusion: functional limitations (eating, speaking), emotional distress about appearance, social embarrassment, and expectations for change following surgery. It has become the standard outcome measure in orthognathic surgery trials.