An occlusal programming unit for obtaining an intraoral recording of a patient's jaw movements comprising a pair of substantially triangular plates formed from a rigid synthetic resin, the peripheral area of each plate being so dimensioned in cross section so that the plate can be readily trimmed to fit the individual shape of the patient's dental arch; the inner face of each plate being provided with a series of grooves or channels leading to the periphery of the plate, in each of which a model locating pin may be located and fixed; model reference pins removably positioned in sockets in the outer faces of the plates; a plurality of scribing pins each adapted to be positioned in one of a series of holes on the inner surface of one plate so that they project towards the inner surface of the other plate; and a spring to hold the plates apart intra-orally, the ends of the springs being located in one of each pair of sockets provided on the inner surfaces of the plates.