Oral Health-Related Quality of Life
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Direct answer
Fourteen questions, seven dimensions — functional limitation, physical pain, psychological discomfort, physical disability, psychological disability, social disability and handicap — measure how the mouth shapes life in the Oral Health Impact Profile (OHIP-14), the most used instrument in oral health-related quality of life research. Alongside it sit the Geriatric Oral Health Assessment Index (GOHAI) — twelve items across physical function, psychosocial function and pain or discomfort, designed for and still favoured in older adults — and the Oral Impacts on Daily Performances (OIDP), eight items scoring actual interference with eating, speaking, cleaning, sleeping, smiling, emotion, work and social contact. All three translate the Locker conceptual cascade — disease, impairment, functional limitation, pain and discomfort, disability, handicap — into numbers, and their outcomes now sit beside clinical indices in prosthodontic trials, xerostomia and oral cancer research, with validated translations available in Indian languages.
What you must remember
- OHIP-14: Slade's 1997 shortening of the 49-item original; 14 items, seven dimensions (two each), scored on a five-point frequency scale from "never" to "very often"; add-score range 0-56 — and higher scores mean worse quality of life.
- GOHAI: Atchison and Dolan, 1990; 12 items across physical function, psychosocial function and pain or discomfort; developed for geriatric use — and its higher scores mean better quality of life, the reverse of OHIP.
- OIDP: Adulyanon and Sheiham, 1997; eight daily performances — eating, speaking, cleaning teeth, sleeping and relaxing, smiling, emotional stability, working and social contact — weighted by severity and frequency; the most behaviourally specific of the three.
- The conceptual spine: Locker's 1988 model adapting the WHO impairment-disability framework — disease leads to impairment (tooth loss), functional limitation (chewing), pain and discomfort, disability (altered diet) and handicap (social withdrawal) — the order examiners quote.
- Where they earn their keep: prosthodontic and implant trials comparing treatment impact, xerostomia and BMS studies, oral cancer survivorship, orthodontic and cleft research, and national oral health surveys — Indian versions of OHIP-14 and GOHAI are validated and in use.
- Interpretation caution: a minimal important difference on OHIP scales is of the order of a few units (commonly cited around five) — statistically significant is not the same as patient-important.
- Why they exist at all: clinical indices count teeth, pockets and caries; OHRQoL instruments count what patients actually feel — eating, speaking, intimacy, confidence — completing the picture that clinical measures miss.
Choosing the right instrument
Three referrals, three instruments. A randomised trial comparing implant-retained and conventional complete dentures in the elderly chooses GOHAI — twelve geriatric-validated items sensitive to prosthetic function, quick to administer to older participants, and scored so that improvement means a rising number (a detail that has ruined more than one analysis when OHIP's reverse coding was assumed). A community survey of oral impacts in adults takes OHIP-14 — the broadest dimensional coverage, the widest comparative literature, and add-scores comparable across studies in different languages. A school-based epidemiological study of children selects OIDP — its eight concrete performances map directly onto a child's day and record actual impacts rather than general feelings. Each instrument inherits Locker's cascade, so results speak the same language: disease to impairment to disability to handicap. In every case the instrument complements, never replaces, clinical examination — the examiner's favourite "which single measure defines oral health" has the structured answer: clinical indices plus OHRQoL together.
Where students slip
The scoring-direction trap tops the list: OHIP scores rise as life worsens, GOHAI scores rise as it improves — mixing them fails the item count and the logic at once. Second, the numbers: 14, 12 and 8 items, and seven dimensions for OHIP — single-best-answer papers quote the item counts precisely. Third, attribution: pairing GOHAI with paediatric populations (it is geriatric by origin) or OIDP with Locker's absence (it is the most direct expression of his disablement cascade). The final slip is conceptual — treating OHRQoL as a soft afterthought; the exam expects the opposite stance: patient-reported outcome measures now sit beside survival and pocket depths as trial endpoints, and saying so is the mark of current reading.
Frequently asked questions
Name the seven dimensions of OHIP-14.
Functional limitation, physical pain, psychological discomfort, physical disability, psychological disability, social disability and handicap — two items each in the 14-item instrument.
How do GOHAI and OHIP-14 differ in scoring direction?
OHIP-14 scores rise with worse impacts; GOHAI scores rise with better oral health — reverse-coded instruments that must never be averaged together.
What does OIDP measure?
Interference of oral conditions with eight daily performances — eating, speaking, cleaning teeth, sleeping and relaxing, smiling, emotional stability, working and social contact — weighted by severity and frequency.
State the Locker conceptual model.
Disease leads to impairment, then functional limitation, pain and discomfort, disability, and finally handicap — the cascade underlying all OHRQoL instruments.
Why are patient-reported outcome measures used alongside clinical indices?
Clinical indices record disease status; OHRQoL instruments record lived impact — eating, speaking and social confidence — capturing treatment benefit that clinical measures alone cannot show.