Abstract

ObjectivesTo investigate the impact of polyetheretherketone (PEEK) surface modification on tensile bond strength (TBS), acidity parameters (D) and surface properties. MethodsFor TBS, 486 PEEK specimens were fabricated and air-particle abraded with 50µm Al2O3 according to varying pressure: 0.05, 0.2 or 0.4MPa. Specimens were directly conditioned (n = 18/group): 1. Scotchbond Universal (SBU); 2. Clearfil Universal Bond (CUB); 3. Futurabond U (FBU), 4. Adhese Universal (AU), 5. G-Premio Bond (GPB), 6. Pekk Bond (PB), 7. visio.link (PCG/positive-control-group), 8. without conditioning (NCG/negative-control-group) and luted with Clearfil SA Cement. After thermal cycling (5,000x) TBS was measured. On air-particle abraded PEEK surfaces and different adhesive systems (n = 6/pretreatment) D was analysed by contact angle measurement, surface roughness tactile by profilometer and optical by SEM with 3D-images followed by surface topography, EDX- and XRD-analysis. Data was analysed using 2-/1-way ANOVA, Kruskal-Wallis H-, Mann-Whitney-U-, Kaplan-Meyer-, Chi²- and Spearman-Rho-test. ResultsPCG followed by SBU and AU showed the highest TBS and survival rates. PB air-particle abraded with 0.4MPa presented comparable TBS with PCG. NCG and GPB showed lowest TBS. Specimens air-particle abraded with 0.05MPa presented lower D-values than those with 0.2 or 0.4MPa. PCG followed by PB showed higher D-values compared to SBU, CUB, FBU, AU and GPB. All air-particle abraded specimens showed embedded Al2O3-particles and for 0.2 and 0.4MPa more roughened surface areas. SignificanceThe pressure during air-particle abrasion of PEEK restorations must be matched to the adhesive system. A general recommendation is not possible. Universal adhesives might be an alternative conditioning for cementation of PEEK compared to PCG.

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