SANDBLASTING INFLUENCE ON BOND STRENGTH OF CoCr ALLOY AND ONE ADHESIVE 10 MDP BASED

Abstract

Traditionally, fixed prostheses based on base metal alloys were retained on their abutments with powder-liquid cement (zinc phosphate, polycarboxylate, glass ionomer). Currently, with the development of CAD-CAM, there is a tendency to make conservative dental preparations. Undoubtedly it is a very good technique, concerning healthy dental tissue. But the resulting restorations would already need cement and adhesives that capable of chemically bonding to the different substrates, so as not to peel off. Manufacturers indicate that molecules such as 10 MDP, VBDATDT, 4-META can bind to metals. METHOD. 30 CoCr cylinders were divided into 3 groups. With the first, sandblasting was carried out and an adhesive agent based on 10 MDP was immediately placed to cement 4 resin microtubes using a resinous cement. The remaining groups were sandblasted in the same way, but in them, it was decided to wait for 24 and 48 hours to perform the adhesive procedure. RESULTS. The immediate group reached the highest values of bond strength. When more time was waited after sandblasting, the lowest values were obtained, even after aging. CONCLUSIONS. CoCr alloys can be cemented with resinous cement, as long as a correct mechanical and chemical surface treatment is carried out.