One operator repaired defective dimethacrylate-based resin restorations that were randomly assigned to one of two treatment groups : control ( n = @ ) , repaired with Adper SE Plus and Filtek P@ Posterior Restorative ( @M ESPE ) ; or test ( n = @ ) , repaired with P@ System Adhesive Self-Etch Primer and Bond and Filtek P@ Low Shrink Posterior Restorative ( @M ESPE ) .