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Influence of plasma pretreatment on shear bond strength of self-adhesive resin cements to polyetheretherketone

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The aim of this study is to evaluate the adhesion between PEEK and two self-adhesive resin cements after plasma treatment.


Eight hundred sixty-four polyetheretherketone (PEEK) disks were cut and polished to silicon carbide (SIC) P4000. One half of the specimens were randomly selected and pretreated with plasma, whereas the remaining 432 specimens remained untreated. Subsequently, specimens were randomly allocated to four groups (n = 108/group): (Bredent), Signum PEEK Bond (Heraeus Kulzer), Ambarino P60 (Creamed), and a control group without additional treatment. Half of the specimens of each group (n = 54) were then cemented with either RelyX Unicem Automix 2 (3 M ESPE) or with Clearfil SA (Kuraray). All specimens were stored in water for 24 h (37 °C). Afterwards, specimens were divided into three groups (n = 18) for different aging levels: (1) no aging (baseline measurement), (2) thermal aging for 5,000 cycles (5/55 °C), and (3) thermal aging for 10,000 cycles (5/55 °C). Thereafter, shear bond strengths (SBS) were measured, and failure types (adhesive, mixed, and cohesive) were assessed. Data were analyzed using descriptive statistics, four- and one-way ANOVA followed by a post hoc Scheffé test (p < 0.05).


No adhesion could be established without adhesive pretreatment, irrespectively, whether plasma was applied or not. Also, no bond strength was measured when Ambarino P60 was applied. In contrast, adhesive pretreatment resulted in SBS ranging between 8 and 15 MPa. No significant differences were found between the resin cements used. In general, no cohesive failures were observed. Groups without plasma treatment combined with or Signum PEEK Bond showed predominantly mixed failure types. Control groups, plasma treated, or treated using Ambarino P60 groups fractured predominantly adhesively.


The use of methyl methacrylate (MMA)-based adhesives allows bonding between PEEK and self-adhesive resin cements. Plasma treatment has no impact on bond to resin cements.

Clinical Significance

PEEK reconstructions can be cemented using self-adhesive resin cements combined with pretreatment with MMA-based adhesives.

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The authors are grateful to Mrs Gisela Dachs, Department of Restorative Dentistry, Dental School Ludwig-Maximilians University, Munich, Germany, for performing the scanning electron microscopy. Special thanks go to Heraeus Kulzer, Kuraray, Bredent, 3 M ESPE and Creamed for supporting this study with materials.

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Correspondence to B. Stawarczyk.

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Stawarczyk, B., Bähr, N., Beuer, F. et al. Influence of plasma pretreatment on shear bond strength of self-adhesive resin cements to polyetheretherketone. Clin Oral Invest 18, 163–170 (2014).

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