referring now to fig1 - 5 , the articulator has a vertical frame having two identical spaced parallel vertical columns 10 and 12 . each column is hollow and contains a shaft 14 which can be extended and manually locked into position by screws 16 to adjust the height as desired . a horizontal bar 18 extends between and interconnects the upper ends of the columns or the shafts 14 if shafts are extended . a flat horizontal member 20 is disposed below the bar 18 and has an extension 22 which is oriented at right angles to bar 18 . a second like member 24 supports the bottom end of the columns and has a like extension 26 . extensions 22 and 24 are spaced apart in parallel alignment . a first horizontal upper elongated metallic plate 28 extends over the first horizontal member 20 . it has a coupling 60 at one end and has a housing 31 in which a magnet 30 is mounted . a first housing 32 contains a ball bearing 33 and attached shaft 34 that is connected to said bar and is disposed over the first extension , said shaft being also connected to the coupling 60 of said first plate as a locking device so that the first plate is pivotable about a horizontal axis that is disposed at right angles to the axis of the bar and the plate cannot move along the horizontal axis . a second horizontal lower elongated metallic plate 36 extends outward parallel to the horizontal extension 26 and is disposed below the first plate . the second plate has a coupling 62 at one end and has a housing in which magnet 38 is mounted a second housing 40 connected to the top surface of member 24 is connected by a ball bearing 33 and shaft 34 to coupling 62 of the second plate 32 as a locking device so that the second plate is pivotable about shaft 34 that is disposed at right angles to the axis of the horizontal bar 18 and the plate cannot move along this axis . a set screw arrangement 42 is connected to the bottom of the first housing to limit the downward movement of the first plate . plate 37 can be individually reversed in position to be left or right quadrants . as shown in fig5 , plate 37 has magnet 50 . each of plates 28 , 36 and 37 has a plurality of holes 44 disposed about the corresponding magnet . each of the first , second and third plates is adapted to engage a corresponding one of first and second dental casts 46 . each cast 46 has an exposed metallic sheet 48 surrounded by a like plurality of raised prongs 52 whereby upon magnetic engagement between plate and sheet each prong engages the corresponding hole . the casts can be easily removed manually or replaced as desired . while the invention has been carefully described with reference both to the detailed description and the drawings , the protection solicited should be limited only by the terms of the claims that follow .