Minamizato et al investigated the compressive strength of the blade type of zirconia dental implants with tunnels drilled by laser process, and found that specimens with tunnels showed lower compressive strength (237 kg/mm²) than specimens without tunnels (371.5 kg/mm²). They concluded that zirconia blades had adequate strength in occlusion.

Kohal et al evaluated the fracture strength of titanium implants with metal-ceramic crowns, zirconia implants with Empress I crowns, and zirconia implants with Procera (Al₂O₃ based) crowns before and after exposure to the artificial mouth. In the nonloaded group, fracture strength was 531.4 N for titanium, 512.9 N for zirconia-Empress I, and 575.7 N for zirconia-Procera. After a chewing load of 1.2 million cycles, fracture strength was 668.6 N for titanium, 410.7 N for zirconia-Empress I, and 555.5 N for zirconia-Procera. Fracture values for metal-ceramic and Procera crowns after artificial loading were significantly higher than for the loaded Empress I crowns. Zirconia implants restored with the Procera crowns possibly fulfill the biomechanical requirements for anterior teeth.

Silva et al examined the effects of full crown preparation on the reliability of the 1-piece zirconia implant. They found that the fracture strength of zirconia implants without preparation was 1023.3 N, and with full crown preparation was 1111.7 N. However, in another study, it was concluded that preparation of the implant heads had a significantly negative influence on implant fracture strength. Investigators evaluated the fracture strength of 1-piece zirconia implants (Sigma) after exposure to the artificial mouth, where a clinical service of 5 years was simulated. Zirconia implant fracture occurred at 725 to 850 N when the implant heads were not prepared, and at 539 to 607 N when prepared. They concluded that the mean fracture strength of zirconia implants ranged within the limits of clinical acceptance.