Effect of Acid-Etching Duration on the Adhesive Performance of Printed Polyetheretherketone to Veneering Resin.

After the treatment of the primer, the cross-section SEM images of the etched interface at ×1000 and ×2500 magnification ( Figure 4 and Figure 5 ) showed an increasing trend of the bonding primer penetrating depth along with the etching duration.

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