RESUMO
BACKGROUND: Dental caries is a major public health issue affecting a large proportion of the general population. The disease is associated with behavioural factors and is thus preventable to a high degree. Individuals may need assistance to be able to change their oral health behaviour. There is a lack of such interventions for adults affected by severe caries. The aim of the study was to evaluate the effect of Acceptance and Commitment Therapy (ACT), a form of cognitive behavioural therapy, on oral health behaviour in young adults with poor oral health. METHODS: The study included a two group parallel randomised controlled trial at general dental clinics, with young adults, 18-25 years of age, ≥ two manifest proximal dental caries lesions (n = 135); 67 were treated with ACT and 68 with standard disease information only, respectively. Primary outcomes: oral health behaviours (tooth-brushing, flossing, use of toothpicks, and additional fluoride use). The CONSORT principles for RCTs were used, including intention-to-treat and per protocol analyses. The Chi-square, Mann-Whitney, and Wilcoxon Signed Rank tests were applied, including effect sizes. RESULTS: The study groups did not differ with regard to oral health behaviour variables at baseline. The intervention group improved all their oral health behaviours significantly over time (effect sizes, 0.26-0.32), while the control group showed improved behaviours on two measures (flossing and additional use of fluoride, effect sizes, 0.22-0.23). CONCLUSIONS: By testing a psychological intervention on young adults (18-25 years of age) with a high prevalence of caries, we found an immediate positive effect with improved oral health behaviours. TRIAL REGISTRATION: TRN ISRCTN15009620 , retrospectively registered 14/03/2018.
