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Effects of abutment height and type of cements on bond strength of monolithic zirconia single crowns luted to one-piece zirconia implants

Sarah Maria Blender, Dentist/Jochen Mellinghoff, Dentist, Dr. med. dent./Sebastian Benedikt Gröller, Dentist/Sigmar Schnutenhaus, Dentist, Priv.-Doz Dr. med. dent., M.Sc./Katharina Kuhn, Senior Dentist, Dr. med. dent./Ralph Gunnar Luthardt, Professor and Head, Prof. Dr. med. dent. habil./Heike Rudolph, Senior Dentist, Priv.-Doz. Dr. med. dent.

DOI: 10.11607/ijp.7110

Purpose: To test the bond strength of one-piece zirconia implants with either standard or reduced height using different luting agents and pretreatments of the ceramic crowns’ inner surfaces. Materials and Methods: Twenty monolithic CAD/CAM–fabricated zirconia single crowns were cemented onto 10 one-piece zirconia implants with either 5-mm or 4-mm abutment height (Z-Look3 Evo SLM, Z-Systems) using 13 different luting agents. After water storage, the crowns were removed using a specially developed test fixture in a universal testing machine (Z010, Zwick/Roell). The maximum force was recorded (N), and the force per area was calculated (MPa). The statistical evaluation was performed using univariate analysis of variance (SPSS version 25.0, IBM). Results: A mean of 4.19 MPa (SD 2.90) at 5 mm and 3.89 MPa (SD 2.85) at 4 mm was obtained for all luting agents. The highest values were achieved for a resinmodified glass-ionomer cement, with 12.37 MPa (4 mm)/12.00 MPa (5mm). The lowest values were shown for a long-term temporary material, with 0.73 MPa (4 mm)/1.07 MPa (5 mm). Only a polycarboxylate cement (P < .001) and a glass-ionomer cement (P = .006) showed statistically significant differences, in favor of the reduced abutment height. The latter did not significantly reduce bond strength for any of the materials examined. Conclusion: Implants with a reduced abutment height are clinically suitable. Pretreatment of the crowns’ inner surfaces with ceramic primer showed to be advantageous.

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