Fig. 3

a Standard retractors warping after hot water-bath annealing and b after autoclaving. c Strength-optimized retractor without intervention (right) and warping after hot water-bath annealing (left)
a Standard retractors warping after hot water-bath annealing and b after autoclaving. c Strength-optimized retractor without intervention (right) and warping after hot water-bath annealing (left)