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二、印模与模型合理并精确的模型是全口义齿达到良好固位和稳定效果的基础。如上讲中所述,全口义齿的主要固位力是利用大气压力和吸附力。要利用好这两种固位力,并使基托下组织能更广泛地支承(牙合)力,则要求做到: 1.基托与组织间密切接触,使其间空气能基本被排尽; 2.基托边缘与组织间密封,在行使功能过程中能阻止空气进入组织面; 3.义齿基托既充分利用可利用的口腔面积又不过长; 4.咬合力作用时,基托下组织受压均匀。上述要求落实在印模上,即是要制取一副边界伸
Second, impressions and models Reasonable and accurate model is a complete denture to achieve a good retention and stability of the foundation. As mentioned above, the main retention force of complete denture is the use of atmospheric pressure and adsorption force. To make good use of these two retention forces and to enable the supraclavicular tissue to support the occlusal force more widely, it is required that: 1. The intimate contact between the base and the tissue allows the air to be drained substantially ; 2. The base edge and tissue between the seal, in the exercise of functional processes to prevent air from entering the tissue surface; 3. Denture base both make full use of the available oral area and not too long; 4. Bite force, the base under Tissue pressure evenly. The above requirements are implemented on the impression that a boundary extension is to be drawn up