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本文介绍了应用覆盖义齿的基本原理。一、牙槽骨的保持牙齿缺失后牙槽骨吸收且下颌牙槽骨吸收大于上颌。以25年为一周期上颌平均高度减少2.5～3mm,下颌平均高度减少9～10mm,其吸收比上∶下=1∶4。最近对总义齿和覆盖义齿(保留3|3牙根)修复的二组病人的研究证明:五年为一周期,覆盖义齿修复组下颌前部牙槽嵴垂直高度仅下降0.6mm。而总义齿修复组下颌牙槽嵴下降5.2mm。这
This article describes the basic principles of applying overdentures. First, the alveolar bone to maintain the loss of alveolar bone after tooth loss and alveolar bone absorption greater than the maxillary. With a 25-year cycle, the mean height of the maxilla decreased by 2.5-3 mm, while the average height of the mandible decreased by 9-10 mm. The absorption ratio was: lower = 1: 4. Recent studies of two groups of patients with total dentures and overdentures (with a 3: 3 root retained) demonstrated that the vertical height of the alveolar ridge in the anterior mandibular anastomosis decreased only by 0.6 mm over a five-year period. The total denture repair group mandibular alveolar ridge decreased 5.2mm. This