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目的：对咀嚼运动各阶段中平衡 与非平衡 时卜颌总义齿基托的张应变与压应变进行研究，对数据处理分析方法进行改进，对基托折断原因进行进一步的了解。方法：采用微机化动态电阻应变仪，测定应变值。并获取时间－应变曲线。结果：无论平衡 与非平衡 ，咀嚼的前期阶段的应变均大于后期阶段（Ｐ＜０．０１）。在平衡 时左右侧腭斜坡的张、压应变基本相等（Ｐ＜０．０５）。在左侧第一磨牙造成 干扰时，右侧腭斜坡为张应变，而左侧腭斜坡为压应变，腭基托中线前部的应变大于其他各部（Ｐ＜０．０１或０．０５）。结论：在义齿修复中平衡 是一个重要问题，是上颌总义齿基托折断最重要的原因之一。非平衡 时咀嚼花生米前期阶段腭中线前部为应变集中区，该区易发生折断。
OBJECTIVE: To study the tensile stress and compressive strain of the denture base in balanced and unbalanced stages of chewing maneuver, and to improve the data processing and analysis methods to further understand the cause of baseplate fracture. Methods: Using computerized dynamic resistance strain gauge, strain value was measured. And obtain the time-strain curve. Results: The strain in the early stage of chewing was higher than that in the late stage (P <0.01), regardless of the balance and unbalance. At equilibrium, the tensile and compressive strains of left and right palatal slopes are almost equal (P <0.05). When the left first molars caused interference, the right palatal slope was tensile and the left palatal slope was compressive. The strain in the anterior part of the midline of the palatal base was greater than that of other parts (P <0.01 or 0.05). Conclusion: The balance is an important issue in the denture restoration. It is one of the most important reasons for the fracture of the maxillary denture base. Unbalanced chewing peanuts in the early stages of palatal midline before the strain concentration zone, the area prone to break.