Influence of Surface Treatment Method and Type of Bonding System on the Adhesion of Polyetherketoneketone

<p>Polyetherketoneketone (PEKK) is expected to be applied to abutments and implant superstructures, since it has been shown to act as a shock absorber and reduce the pressure on the implant body during chewing. PEKK has a chemically stable structure, and it is known to be difficult to bond the resin cement chemically. In this study, the effects of various bonding systems on the bonding strength of PEKK and resin cement were investigated using rocatec treatment and sandblasting treatment, which are simple surface treatment methods.</p><p>This study used various bonding systems : Superbond/V primer bonding system (SB/VP), Superbond/PZ primer bonding system (SB/PZP), Panavia V5/Clearfil Ceramic Primer Plus bonding system (PV5/CP), and glass ionomer cement (GI). The PEKK polished surface was subjected to rocatec treatment or sandblasting treatment. Thereafter, the primer of the bonding system was allowed to act for the predetermined time according to the manufacturer's instruction, and then resin cement was filled and polymerized to prepare PEKK bonding specimens. Next, the shear bond strength was measured with the universal tester for PEKK bonding specimens. PEKK specimens were observed by scanning electron microscope (SEM), and the surface roughness of the PEEK surface treated by rocatec or sandblasting was measured.</p><p>As a result, the bonding strength of the PEKK surface subjected to rocatec or sandblasting treatment was improved in all the bonding systems. However, the rocatec treatment showed significantly lower values than the sandblasting treatment, and many adhesion defects were observed by SEM. The maximum bond strength was attained when the PEKK surface was treated by sandblasting and SB/PZP was applied. On the other hand, there was no significant difference in the surface roughness between rocatec and sandblasting treatment.</p><p>From the above, it was considered that when rocatec was applied to the PEKK surface, the silica coating layer that formed on the PEKK surface acted as a peeling layer, and therefore the bonding strength was lower than with sandblasting treatment. In addition, the bonding strength showed different values for each bonding system.</p>