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Table 1 Comparison between zirconia, lithium disilicate, and PEEK hybrid-abutment-restorations regarding tightening torque (Ncm), loosening torque (Ncm), torque loss (Ncm), and percentage of torque loss (%)

From: Hybrid-abutment-restoration: effect of material type on torque maintenance and fracture resistance after thermal aging

 ZirconiaLithium disilicatePEEKp value
Tightening torque25.08 ± 0.1325.12 ± 0.1525.14 ± 0.190.70
Loosening torque22.38 ± 0.6822.49 ± 0.4722.61 ± 0.590.68
Torque loss2.70 ± 0.592.63 ± 0.462.55 ± 0.500.80
Percentage of torque loss10.74 ± 2.3910.45 ± 1.8310.11 ± 1.990.79