Maria Teresa Atta Alves Bastos

Tensile strength of five types of retention for resin-bonded prostheses

The tensile bond strengths of five retention techniques for bonded cast restorations were tested. The retentive methods were the electrolytic etch, Rochettes perforations, retention beads, the recessed surface, and soldered orthodontic mesh. The electrolytic etch and recessed surface methods gave the highest values of bond strength, followed by retention beads. Rochettes perforations and the soldered orthodontic mesh failed to surpass the bond strength of the control group (no additional retention) after 1 hour and provided the lowest bond strength after 24 hours.

Evolução dos preparos das cavidades de classe II

Developments in preparation of class II cavities with the introduction of new materials and awareness of the importance of preservation of a sound dental structure are broached in preparations of the type Almqvist, Roggenkamp and tunnel, where the need for less wear of the dental structure was observed with an increase in fracture strength, better aesthetics, and better retention