Clinical experince with an epoxy resin adhesive for direct bonding of orthodontic attachments.

An epoxy resin formulation developed in the Dental Research Unit has been subjected to further clini­ cal trials. Six patients, were used in the study. They were divided into two age groups and all the teeth, including the first molars, bonded. Rubber dam was used to keep the crowns dry during the setting period o f the resin. In the younger group the mean failure rates were 27 per cent fo r anterior teeth and 70 per cent fo r the first molars. In the older group these rates were 11 per cent fo r incisors, 11 per cent fo r canines, 20 per cent fo r premolars and 20 per cent fo r first molars. While no figures are availa­ ble in the literature relating to direct bonding to first molars, the results obtained in this study fo r the other teeth compare favourably with data pre­ viously published by other authors after trials using other types o f cement.