目的使用影像学手段分析种植义齿颈部牙槽骨丧失情况。
Objective To analyze peri - implant alveolar bone loss with radiography.
目的：揭示类风湿性关节炎患者关节炎严重程度与牙周骨丧失程度的相关性。
Objective:To study the correlation between the degree of rheumatoid arthritis(RA) and periodontal bone loss.
目的研究分析儿童正常乳磨牙牙槽骨的高度，探讨影响儿童牙槽骨高度的各种因素及其测量方法，确定儿童牙槽骨丧失的诊断标准。
Objective Study the alveolar bone height of normal primary molars of children, discuss the influencing factors and measuring methods and determine the diagnosis criteria of alveolar bone loss.
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