THE PHYSICAL-PROPERTIES AND BEHAVIOR OF MAGNETS USED IN THE TREATMENTOF ANTERIOR OPEN BITE

This investigation examined the magnetic flux and repulsive force of n eodymium-iron-boron (Nd-Fe-B) magnets used in repulsion in the treatme nt of anterior open bite. Three different grades of magnets each of fi ve different dimensions were used. Magnetic flux was measured by a Hal l probe and the repulsive force by an Instron mechanical testing machi ne. Results showed that the different grades of magnet displayed simil ar magnetic flux with a relationship between thickness and flux. There was a significant difference between the flux measured at the end as opposed to the center of the magnet. The force between two magnets and the flux above each magnet was directly related. Using magnets in gro ups did not produce higher forces than using single magnets of an equi valent size. It was concluded that Nd-Fe-B magnets can be used to give predictable repulsive forces in the mouth.