Lucas P W, Ow R K, Ritchie G M, Chew C L, Keng S B
J Dent Res. 1986 Mar;65(3):400-4. doi: 10.1177/00220345860650030501.
Different quantities and sizes of peanuts were offered to six human subjects for mastication at two or three experimental sessions during which jaw movements and chewing cycle duration were measured. The amplitude of vertical movement and cycle duration depended on the position of a chew in a sequence of chews (masticatory sequence). Cycle duration also depended on the position of a given masticatory sequence during the first experimental session, the earlier sequences tending to be longer. Lateral jaw movements fluctuated about a reasonably constant value during a sequence and were unaffected by different food inputs. The amplitude of vertical movements increased markedly with an increase in food weight but was unaffected by change in the initial food particle size. These results were analyzed in the light of previous reports on the comminution of peanuts. It is hypothesized that observed jaw movements were unrelated to food particle size but that the amplitude of each vertical movement depended on the volume of food that was broken by the teeth during the next closing stroke. This food volume was provided and selected by bulk movements of the tongue during the preceding jaw opening.
向六名受试者提供了不同数量和大小的花生，让他们在两到三次实验过程中进行咀嚼，期间测量了下颌运动和咀嚼周期时长。垂直运动幅度和周期时长取决于一次咀嚼序列中某一口咀嚼的位置（咀嚼序列）。周期时长还取决于第一次实验过程中给定咀嚼序列的位置，较早的序列往往更长。在一次咀嚼序列中，下颌的侧向运动围绕一个相当恒定的值波动，并且不受不同食物投入的影响。垂直运动的幅度随着食物重量的增加而显著增加，但不受初始食物颗粒大小变化的影响。根据之前关于花生粉碎的报告对这些结果进行了分析。据推测，观察到的下颌运动与食物颗粒大小无关，但每次垂直运动的幅度取决于在下一次闭口冲程中被牙齿咬碎的食物体积。这个食物体积是由前一次下颌张开时舌头的整体运动提供并选择的。
