Education-related inequality in restorative dental treatment need over 11 years in two areas of Finland.

Abstract

This study aimed to analyse education-related inequality in restorative dental treatment need among adults aged 30 years and older living in Northern and Southern Finland in 2000 and 2011. Data were taken from the Health 2000 and 2011 population-based follow-up surveys, including information gathered by interviews and clinical dental examination. Final effective sample sizes were 2423 people in 2000 and 1192 people in 2011. Restorative dental treatment need was measured with number of decayed and/or fractured teeth (DT + FrT). Education-related inequality in number of DT + FrT and factors explaining it were analysed using the Poisson regression analysis, relative index of inequality and slope index of inequality. Average number of DT + FrT decreased from 2000 to 2011. Absolute and relative education-related inequalities in them decreased approximately 50% and 25% from 2000 to 2011, respectively. Tooth brushing frequency and time since last dental visit explained approximately 30%-40% of the education-related inequality. The contribution of time since last dental visit to the education-related inequality was smaller in 2011 than in 2000. It seems that, from 2000 to 2011, the need for restorative dental treatment decreased simultaneously with the education-related inequality in it among adults aged 30 years and older living in Northern and Southern Finland.