Effectiveness of motivational interviewing training for primary care dentists and dental health technicians: Results from a community clinical trial

Motivational interviewing (MI) is an approach that uses dialogue about behavioral change to encourage a constructive relationship between professionals and patients. The aim of this study was to evaluate the maintenance of basic MI skills in the daily practice of dentists and oral health technicians (OHTs) after a training course and for two years of follow-up in the context of primary health care (PHC). A randomized community trial, from September 2012 to September 2014, was conducted at the Community Health Service of Conceição Hospital Group in Porto Alegre, RS, Brazil. The experimental group consisted of all 41 dentists and OHTs who received an intensive eight-hour training course in basic MI principles; the control group consisted of 31 dentists and OHTs who did not receive MI training. The follow-up assessments were at one and two years using three instruments validated for MI. In the one- and two-year follow-ups, improvement was maintained in responses with a statistically significant difference for use of open questioning, reflective listening, and total percentage of correct answers (p<0.001), with a large effect size (ES=1.12). On the Helpful Responses Questionnaire, the participants continued using open questioning and reflective listening (p<0.001), maintaining an increase in the percentage of responses compatible with MI (p<0.001). Likewise, the effect size remained large (ES=1.33) over time. These results suggest that the training course with dentists and OHTs of the PHC oral health staff was effective over the two-year follow-up in enabling them to act in the spirit and techniques of MI.