Randomized clinical trial of four adhesion strategies in posterior restorations-18-month results.

Purpose: To evaluate the 18-month clinical performance of four adhesive strategies in posterior composite restorations placed in private practice.

Materials And Methods: Upon approval by an institutional review board, 144 restorations were inserted in 45 subjects (average age = 32.6) to treat caries lesions or to replace existing restorations in vital molars and premolars.