Method: Twenty-four specimens were tested. One or two opposite pairs of Nd2Fe14B magnets, presenting different shapes and volumes, were mounted in universal testing machine allowing to record magnetic repulsion forces from 0,0 to 20 mm of distance between opposite pairs
Result: Analysis of Variance (p≤.05) indicated that by increasing the distance between the pairs of magnets, magnetic repulsion force significantly reduces in most of the specimens. Starting at 0,0 mm distance, the magnetic repulsion forces keep an enhancing sequence from lower to higher magnetic volume, holding these characteristics during initials distances. At distance 0.0 mm, the biggest repulsive force was 21,2 N (0,53) measured in specimens of 942 mm3 and the lower repulsive force [2,4 N (0,25)] was measured in specimens of 50,24 mm3. At distance 10 mm, the biggest and the lower repulsive forces were 1,0 (0,00) and 0 N (0,00) in specimens of 942 and 50,24 mm3, respectively. At distance 20 mm, the biggest repulsive force was 0,2 N (0,06) in specimens of 942 mm3 and the lower repulsive force was 0 N (0,00) in specimens of 50,24, 100,48 and 192 mm3. The repulsion magnetic force, fixing the same pole surface area, presents a direct relationship between volume and magnetic axis.
Conclusion: The magnetic repulsion force, as well the magnetic attraction force, presents a hyperbolic curve of force reduction due to the increasing distance and may be used in clinical situations.