More surprising myths, busted by Bisco

If a material contains calcium, it must release calcium

For calcium to be released, the material must allow for ion exchange to occur. If the matrix of the calcium-containing material is too hydrophobic, then calcium will not be released due to a lack of ion exchange. The matrix needs to be relatively hydrophilic for ion exchange (and calcium release) to occur. 

Not all MDP is created equal

Some companies claim their MDP is superior to others. However, 10-MDP is a chemical monomer, it is what it is, like all H₂O is water. What makes the biggest difference in efficacy is the formulation and the amount of MDP – the ratio between MDP, solvent (ethanol) and water. That is what differentiates adhesive formulations, not the MDP itself. 

You don’t need to cure the adhesive layer under indirect restorations

If the adhesive is light-cured, it MUST be fully polymerized BEFORE seating the indirect restoration for the highest bond strength. If the adhesive is left uncured, the result will be a lower bond strength between the tooth preparation and the restorative surface. If a clinician wants to avoid light curing the adhesive under indirect restorations, a dual-cured adhesive should be used.