A 3-YEAR CLINICAL-TRIAL USING A GLASS-IONOMER CEMENT FOR THE BONDING OF ORTHODONTIC BRACKETS

Recent clinical studies measuring orthodontic bracket failure, when us ing glass ionomer cement as an adhesive, have reported a wide range of percentages of bracket failure. The present study recorded bracket fa ilure over a 3-year period, longer than had been previously measured. Seventeen participants were randomly assigned to one of two treatment groups, either using glass ionomer cement or composite resin for bondi ng. In each group, brackets were bonded to incisors, canines, and prem olars. Bracket failure was measured over the duration of comprehensive orthodontic treatment for all participants. Brackets bonded with the glass ionomer cement were more likely to fail (log-rank test; P less t han or equal to 0.022). This difference was clinically significant. At the present time, the disadvantage of extra bracket failures appears to outweigh potential advantages when considering glass ionomer cement for the routine bonding of orthodontic brackets.