MASTICATORY EVALUATING METHOD FOR COMPLETE DENTURE WEARERS

为建立客观的咀嚼性能评价方法，对下颌运动技能进行了研究。实验对象为8例健康全齿患者，1例模拟患者用50mu粘接暂时性金属冠。M垂直交错干扰。下颌骨沿2Hz的声音信号进行叩击运动。使用SIROGNATHO ANALYZER III （Kanops, Co）同时记录下颌运动痕迹和咀嚼肌肌电图。结果表明，8只健康足齿动物的下颌运动周期与颞肌肌电图的偏差均较小。另一方面，与模拟患者的其他10次中风相比，从第一次中风到第10次中风的周期时间偏差极不稳定。提示下颌运动周期时间偏差可作为评价下颌运动控制能力的有效参数。在咀嚼3克花生时，用实验舌板（ELP）和不使用实验舌板（ELP）分析了舌头和下颌运动之间的关系。此外，还用筛分法评价了咀嚼效率。在ELP插入后1、3、6、12、24和48小时，使用超声诊断设备和SIROGNATHO ANALYZER III同时记录这些运动。测量各组咀嚼动作中舌部和下颌运动周期时间。结果如下：与植入ELP前相比，植入ELP后咀嚼效率明显下降。舌部运动周期时间和下颌骨运动周期逐渐恢复到舌部插入前的水平。舌部垂直动量的变化与舌部效率的变化相同。这表明舌和下颌运动的协调对充分咀嚼是非常重要的。利用表征舌垂直动量随咀嚼过程变化的参数，可以有效地评价咀嚼性能。少

To establish the objective evaluating method for masticatory performance, the skill of mandibular movement was investigated. The subjects were 8 healthy fully dentates and a simulated patient cemented the temporally metal crown with 50mu.m vertical occiusal interference. Tapping movements of mandible were performed along to the sound signal with 2Hz. Traces of mandibular movement using the SIROGNATHO ANALYZER III (Kanops, Co) and EMG of masticatory muscles were recorded simultaneously. The results showed that the deviations of cycle time of mandibular movement and EMG of temporal muscles were striking small in the 8 healthy fully dentates. On the other hand, the deviations of cycle time from the first stroke to the tenth stroke were extremely unstable comparing other ten strokes in the simulated patient. It was suggested that the deviation of the cycle time of mandibular movement would be an effective parameter of evaluation for the control ability of mandibular movement.The relationsh … More ip between tongue and mandibular movements were analyzed with and without an experimental lingual plate (ELP) while chewing 3 grams of peanuts. Moreover, masticatory efficiency was also evaluated by the sievingmethod. These movements were recorded simultaneously by use of ultrasound diagnostic equipment and the SIROGNATHO ANALYZER III immediately after, 1, 3, 6, 12, 24 and 48 hours after insertion of ELP.The cycle time of tongue and mandibular movement in all the chewing strokes were measured. The results were as follows. The masticatory efficiency immediately after ELP insertion decreased significantly compared to that of before the insertion of the ELP.The masticatory efficiency, cycle time of tongue movement and the mandibular movement with the insertion of the ELP gradually recovered to the levels prior to the insertion of the ELP.The vertical momentum of tongue indicated the same change as the mast icatory efficiency.It was suggested that the coordination of tongue and mandibular movement was very important for sufficient mastication. Theuseof theparameter indicating the change with mastication proceeding of vertical momentum of tongue would be effective to evaluate for masticalory performance. Less