Etched-metal resin-bonded intracoronal cast restorations. Part I: The attachment mechanism

Numerous attempts have been made to increase the adhesive qualities of the luting medium. Investigators have attempted to modify the metal surface, the tooth surface, the luting material, or combinations. Although investigations have achieved limited success, the adhesive cement remains an elusive goal of restorative dentistry. This article described the etched-metal attachment mechanism as an intermediate phase between luting medium and adhesive medium. However the bond of the resin to the etched enamel and etched metal is not adhesion. Nevertheless, the continuity and microscopic dimension of the mechanical bond mimics the adhesion desired. Until that adhesive material is developed, the bonding mechanism will serve as an effective substitute. The attachment mechanism described is the basis for an improved restoration. Resin-bonded retention can compensate for insufficient frictional retention or may completely substitute for frictional retention prescribed in a resin-bonded retainer prosthesis. Etched-metal procedures for intracoronal restorations permits conservative tooth preparation, greater retention, and improved support of remaining cusps.