Fig. 2From: Pilot investigation into osteotome hard surface coating and cutting-edge degradationa Schematic of blade sharpness index testing using standardized force to press blade into soft wax substrate. Osteotome is shown clamped by vice in upward position with opposing soft wax substrate facing downward being located at end of hinged arm. b Blade penetration depth into soft wax substrate, measured by distance δBack to article page