Fine thread versus coarse thread. A comparison of the maximum holding power.

摘要: Abstract For osteosynthesis in the epiphyseal region of long bones, specialized screw types are available to achieve a better purchase cancellous bone. Typically, bone has large outer thread diameter with relatively small core and great pitch. Due its dimensions, this type is not suited for areas hand foot surgery, respectively. Fine machine screws adapted dimensions part skeleton. To compare holding power fine other market, biomechanical study was undertaken. Different were compared: 4 mm screw, 3.5 2.7 mm cortical three different diameters (2.2, 1.6 1.2 mm). Both tested pretapped self-tapping version. Polyurethane foam bovine tested. The applied according manufacturer’s instructions an axial extraction force applied. superior all both test materials (P Relative their diameter, conventional high at least partly due impaction effect drilling debris between abutting spongy structure.