Effect of posterior tooth form on jaw and denture movement

Masticatory function—a review of the literature

“…Rudd, Morrow & Jendresen (1969) recorded envelopes of motion and functional movements in the horizontal, frontal and saggital planes. In contrast to Woelfel et al (1962), and Atkinson & Shepherd (1967a) they found most ofthe maximum velocities were reached during the closing phases of the chewing cycles. The maximum velocity of the mandible in the molar region during function, recorded in millimetres per second, is given in Table 1.…”

“…Interindividual variations in chewing rate were significant, and they found that the consistency and other properties of the food affected the chewing rate. Variation of chewing rate with different test foods was also found by Woelfel et al (1962) who showed that peanuts were initially difficult to position upon the occlusal table, and so the chewing rate increased as the peanuts became broken down. This is in contrast to Neill (1967) and Perez (1967).…”

“…The rate of chewing obtained by Neill showed remarkable consistency when compared with previous workers' results, and was independent of the type of food consumed. Perez (1967) recorded a range of 76-123 chews per min in his experiments on five subjects using the radiotelemetry system of Wain (1969) and, whilst showing variation between the subjects, he showed a higher chewing rate than obtained by Neill (1967)who also used radiotelemetry-or by the techniques of others (Shepherd, 1960;Woelfel et al, 1962;Hedegard et al, 1970;or Beam, 1972). He agreed with Neill that individuals tend to have their own chewing rate, and found that this can be aflFected by the retention and stability of the dentures.…”

“…Is. Woelfel et al (1962), as part of their study, assessed the speed of chewing of the six edentulous subjects wearing complete dentures. These six subjects included two women and five of the subjects had good alveolar ridges.…”

Masticatory function—a review of the literature

“…They further commented that in those patients with complete upper dentures, the time from incision to swallowing was longer than in those with natural dentitions. Woelfel, Hickey & Allison (1962) studied the effect of posterior tooth form on jaw movement. Peanuts, carrots and unvulcanizcd rubber were used as test materials, and photographs were studied with a motion picture film analyser and ultimately produced in a graphic form.…”