What is the recommended duration for applying 10% polyacrylic acid as a primer for glass ionomer?

The recommended duration for applying 10% polyacrylic acid as a primer for glass ionomer is 10-15 seconds. This time frame is optimal because it allows sufficient interaction between the polyacrylic acid and the glass ionomer material to facilitate chemical bonding. The acidic environment created by the polyacrylic acid helps to clean and prepare the glass ionomer surface by removing contaminants and enhancing the adhesion properties.

Using this duration ensures that the primer effectively conditions the surface without over-etching, which could compromise the integrity of the glass ionomer. Prolonged application beyond this window may lead to excessive demineralization or weakening of the substrate, which could affect the ultimate performance and longevity of the glass ionomer restoration. Therefore, adhering to the 10-15 seconds application time strikes a balance between effective priming and avoiding potential damage, making it the most recommended approach in clinical practice.