Objectives: The retentive strength of a resin cement in combination with a conventional adhesive (Variolink II/Syntac Classic, Ivoclar Vivadent), two resin cements with self etching adhesives (Panavia F 2.0/ED Primer, Kuraray, Multilink/Multilink Primer A/B, Ivoclar/Vivadent), two self adhering cements (RelyX Unicem, 3M Espe, Maxcem, sds Kerr), and a resin modified glassionomer-cement (Fujicem, GC) were examined for luting zircon-oxide ceramic crowns (LAVA, 3M Espe) on extracted human teeth. Method: 80 extracted teeth (n = 10) were prepared in a standardized manner (10°, h = 3mm). The resin cements and the adhesive system were used according to manufacturers recommendations; in dual-curing systems, only the self-curing approach was conducted. The crowns inner surfaces were sandblasted (Rocatec Pre). Additional pretreatment was carried out with Multilink (Metallprimer or Monobond S). With RelyX Unicem also one group with Rocatec Plus pretreatment was examined. After thermocycling (5000 x, 5-55°C), the cemented ceramic crowns (Rocatec-pretreatment at the outer surface; connected over a low shrinkage epoxy resin to macro-mechanical undercuts in a resin block, made out of Paladur denture base material) were removed along the path of insertion using a Zwick universal testing device. The retention surface was determined individually for each tooth (Dahl & Oilo, Dent Mater 2, 1986). Statistical analysis was made using the SPSS 11.0 program. Results: The retentive strength values [N/mm2] were (Min/Q1/Median/Q3/Max): Variolink II/Syntac: 2.6/3.9/4.1/5.2/8.9, Panavia F 2.0: 0.4/1.3/2.5/4.4/5.4, Multilink/Metallprimer: 1.4/2.2/3.2/4.8/7.6, Multilink/Monobond S: 1.5/2.6/3.9/4.8/8.1, RelyX Unicem: 4.1/5.0/5.9/6.5/11.8, RelyX Unicem/Rocatec Plus: 2.1/4.6/5.6/6.6/7.6, Maxcem: 1.5/2.0/2.3/2.6/4.3, Fujicem: 1.6/1.7/2.3/4.1/8.0. Conclusion: RelyX Unicem showed the highest median retentive strength values, followed by Variolink II and Multilink. This study was supported by Ivoclar Vivadent, 3M Espe, Kuraray, and sds Kerr.

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