Abstract
To assess the associations between oral disease and oral health-related quality of life (OHRQoL) in a nationally representative sample of 12- and 15-year-old Thai populations. The study was part of Thailand National Oral Health Survey. Data on oral diseases using WHO criteria and OHRQoL using the Child-Oral Impacts on Daily Performances (Child-OIDP) for 12-year-olds and Oral Impacts on Daily Performances (OIDP) indexes for 15-year-olds were collected from 1063 12-year-olds and 811 15-year-olds. The associations of oral diseases and OHRQoL and perceived dental need were investigated using logistic regression models. Of 81.7% of 12-year-olds and 83.2% of 15-year-olds had impacts on OHRQoL. For both age groups, gingivitis was the most common oral disease (79.3% in 12-year-olds, 81.5% in 15-year-olds). Oral impacts were significantly associated with high levels of untreated decay. Perceived dental needs were significantly associated with untreated decay and extensive gingivitis for both age groups, and with calculus for 12-year-olds. Having decayed teeth was statistically associated with impacts on relaxing, emotion and study for both age groups. Gingivitis and calculus were significantly associated with impacts on smiling, study and social contact in 12-year-olds, and with impacts on smiling in 15-year-olds. Gingivitis was the most common oral disease whereas dental caries affected children's quality of life most. Dental caries impacted on various daily life performances while gingivitis and calculus related to psychosocial aspects in 12-year-olds.
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