Orthognathic Quality of Life Questionnaire (OQLiQ)
Orthognathic Quality of Life Questionnaire · Also known as: OQLiQ, 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.
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When to use it
The OQLiQ is used in orthognathic surgery settings to assess baseline quality of life and functional burden in candidates for surgery, informing surgical planning and psychological preparation. It is the standard outcome measure in randomized controlled trials and cohort studies evaluating efficacy of orthognathic surgery compared to non-surgical treatment (orthodontics alone) or wait-list control. The OQLiQ guides patient selection (identifying those with high psychosocial burden likely to benefit most) and informs shared decision-making about surgery timing and expectations. It is also used in health services research and economic evaluation of orthognathic surgery.
Strengths & limitations
- Condition-specific to dentofacial deformity and orthognathic surgery context; captures impacts not assessed by generic instruments (OHIP-14, SF-36)
- Psychometrically robust with good internal consistency (Cronbach α = 0.80-0.85 for total scale) and acceptable test-retest reliability (ICC ≥ 0.75) in pre- and post-surgery patients
- Multidimensional (emotional, functional, awareness, expectancy) enabling comprehensive assessment of surgical benefit across multiple domains
- Highly responsive to orthognathic surgery: demonstrates large pre-post improvements (mean 15-25 point reduction on total scale), with effect sizes typically d > 1.5
- Valid for longitudinal tracking: sensitive to change across pre-operative, immediate post-operative, and long-term follow-up periods (6-24 months)
- Designed specifically for severe malocclusion (orthognathic candidates); not appropriate for mild malocclusion or general dental populations; limited discriminant validity in non-deformity groups
- Ordinal scale; parametric assumptions may be violated; non-parametric and ordinal regression preferred
- Recall period and timeframe not explicitly specified in some publications; interpretation of 'current' vs. 'past month' impacts may vary
- Does not assess all quality-of-life domains (e.g., general mental health, overall life satisfaction); complementary generic instruments may be needed for comprehensive outcome evaluation
Frequently asked
When should OQLiQ be administered—before surgery, during braces, or after?
Standard practice is baseline administration immediately before surgery (at final pre-operative visit). Post-operative assessments occur at defined intervals (3, 6, 12, 24 months). Some studies assess during pre-surgical orthodontics to track changes during dental alignment; less common. Always document exact timepoint relative to surgical date.
What is the minimal clinically important difference (MCID) for OQLiQ?
Published MCID estimates range from 8 to 12 points on the 22-88 scale. A reduction of ≥10 points (improvement) is generally considered clinically meaningful. For domain subscales, MCID varies; published estimates suggest ~3-5 point change per domain.
Can OQLiQ be used in patients with syndromes (cleft lip/palate, hemifacial microsomia) requiring surgical correction?
The OQLiQ was developed in non-syndromic dentofacial deformity; use in syndromic patients should be cautious and supplemented with syndrome-specific measures. Patients with cleft may have additional functional concerns (speech, feeding) not fully captured by OQLiQ.
How do I interpret OQLiQ expectancy subscale scores?
High expectancy scores (7-8) indicate strong belief that surgery will improve life quality and function; these patients often show largest post-operative satisfaction. Moderate scores (4-6) suggest uncertain expectations; clinical counseling important. Low scores may indicate skepticism or secondary surgical motivation (family/social pressure), warranting discussion.
Sources
- Cunningham, S. J., Garratt, A. M., & Hunt, N. P. (2000). Development of a condition-specific quality of life measure for patients with dentofacial deformity: I. Reliability of the Orthognathic Quality of Life Questionnaire. Community Dentistry and Oral Epidemiology, 28(3), 195-201. DOI: 10.1034/j.1600-0528.2000.280305.x ↗
How to cite this page
ScholarGate. (2026, June 3). Orthognathic Quality of Life Questionnaire. ScholarGate. https://scholargate.app/en/dentistry/orthodontic-specific-qol
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