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Stress analysis in bone during removal of the screw-type temporary anchorage device

, : Stress analysis in bone during removal of the screw-type temporary anchorage device. Shika Igaku 70(1): 7-12

We used three-dimensional finite element analysis to investigate how the shape of the screw-type temporary anchorage device (TAD) affected stress distribution in the bone during removal. Two different shapes of titanium screws were tested. The simulated alveolar bone had 1 mm of cortical bone, with the remainder being cancellous bone. Finite element models were prepared for both the straight and taper type screws and torque loading during removal was imparted on either the top of head or the top of the screw.The results demonstrated that the different TAD shapes and loading positions produced significantly different results. The taper type screw and gripping the top of the screw produced distinctly superior results. The shape of the TAD and how it is gripped are important factors for its safe removal.


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