The use of monolithic zirconia restorations has gained popularity because of its good biocompatibility, improved esthetic quality, high strength and fracture toughness, optical properties, and the overcoming of veneer cracking or chipping problems with veneered zirconia and fabrication of the restoration from presintered homogenous blocks with CAD/CAM technique that contributes to limited amounts of manufacturing defects and reduced production time and cost. The retention strength of zirconia crowns was improved with Multilink Speed and Panavia V5 cement systems, while the use of the Duo-Link Universal cement system only showed half of those retention strength values. The failure modes for Groups M and Group P were mainly cohesive, while Group D showed adhesive failure. There was no significant difference ( P = .34) between Group M and Group P. The data were statistically analyzed using one way ANOVA test followed by Tukey HSD test (α = .05). The failure modes were recorded for each specimen. The force at dislodgment was recorded and retention strength was calculated for each specimen. Each crown was subjected to gradually increasing vertical load along the path of insertion through hooks engaging the occlusal bar using a universal testing machine until failure. All specimens were thermocycled for 10,000 cycles between 5 and 55 ☌. Then each crown was cemented onto its corresponding tooth. The intaglio surfaces of crowns were air-abraded using 50 µm alumina at 2.5 bar for 10 s. ![]() All specimens were divided (n = 10) into Group M: Multilink Speed/Monobond N, Group P: Panavia V5/Clearfil Ceramic Primer Plus, Group D: Duo-Link universal/Z-Prime Plus. A zirconia crown with an occlusal bar was fabricated for each tooth. Thirty extracted molars were prepared with flat occlusal surfaces, 20 degrees taper, and 3 mm axial wall height. ![]() The purpose of this in vitro study was to assess the influence of different cement systems with different ceramic primers on the retention strength of zirconia crowns.
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