Adhesion and tooth-colored restoratives.

Research aimed at developing durable adhesion between esthetic restorative materials and tooth surfaces has been progressing for over 35 years. Inherent deficiencies in many esthetic materials have directed research toward new adhesive agents and modifications in application techniques. Overcoming these deficiencies has been difficult and many questions remain despite encouraging developments. A new generation of resin dentin-bonding agents has surfaced and may further adhesive efforts with modern composite resins. The glass-ionomer cement continues to establish itself as a valuable adhesive direct restorative material. Recent advances in glass-ionomer technology have given rise to new lining materials that may also complement composite resin behavior. The use of dentin conditioners or pretreatments has been explored and may enhance the adhesion of esthetic restoratives as well. Finally, a better understanding of application techniques and of the tooth surface itself may offer new insights into developing more stable adhesion with esthetic restorative materials.