Posterior tooth replacement with a full crown and acid-etched wing as retainers

With the advent of stronger adhesive materials and preparations that increase retention and lateral stability, acid-etched retainers provide an alternative approach to fixed bridges. Preparations for acid-etched retainers are more conservative, but may be more difficult to accomplish. Factors that must be considered to ensure successful cases include proper case selection, attention to preparation techniques, impression techniques, moisture control and cementation techniques.