| Q: The CEMPOWER IFU states that you should use pumis and water. Is this to add retention? What would the results be if you did not do so? |
| A: Applying pumice and water to the tooth to be treated is to clean the surface, and if the surface is not clean, the adhesion may be reduced by foreign substances. |
| Q: Can I use Ivoclean (Ivoclar) universal cleaner to clean the surface area? |
| A: Yes, The universal cleaning paste Ivoclean effectively cleans the bonding surfaces of prosthetic restorations after intraoral try-in and thus creates optimum prerequisites for the adhesive luting procedure. |
| Q: The IFU’s state to not use peroxide or EDTA? Can you explain why and what would happen if they were used? |
| A: Ethylenediamide tetraacetic acid (EDTA) is a chelating agent which combines with the calcium ion and inactivates it, thereby exerting its decalcifying effect on dentine.
Theoretically, the higher concentration of EDTA should facilitate the infiltration of resin cements into the dentinal tubules, since the chelating action of EDTA significantly promotes their cleaning. However, the solution excessively removes the dentin matrix, causing collagen fibrils to collapse and compromising the interaction of self-adhesive resin cement with the radicular dentin.
In conclusion, the application of EDTA can reduce the adhesion of self-adhesive resin cement to dentin. Hydrogen peroxide can inhibit the polymerization of self-cure resin cement. |
| Q: Can you use acid etch techniques to increase adhesion? |
| A: Acid etching before the application of self-adhesive resin cements results in generally higher bond strength when compared with no surface treatment. Because acid etching more effectively removes the smear layer and demineralises or etch the enamel. The resultant enamel surface has high surface area. The resin penetrates into these microporosities and intimately adheres to form a retentive resin tag, generating higher micromechanical retention. |