The central zone of tensile stress moved to the frenal notch from the pre palate and palatal side of the denture incisor of the base;
拉应力集中区由基托前腭部、前牙腭侧移动到唇系带切迹区；
The central zone of tensile stress moved to the frenal notch from the pre palate and palatal side of the denture incisor of the base;
拉应力集中区由基托前腭部、前牙腭侧移动到唇系带切迹区；
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