本研究探讨了下颌角点皮质骨的厚度和下颌骨联合部皮质髓质骨的比例与剩余牙槽嵴吸收(RRR)率的关系。另对下颌角处皮质骨厚度在X线全景片和头颅侧位片两种方法中测量值进行了比较。材料和方法抽样调查了82例患者(其中男性29例,女性53例),年龄30～82岁,平均50.5岁,失牙期2个月至53年,平均18年。资料记录包括所有拟作种 This study explores the relationship between the ratio of mandibular cortical bone thickness at the mandibular angle and cortical medullary bone in the mandible and residual alveolar ridge absorption (RRR). The mandibular angle cortical bone thickness in the other two methods of X-ray panoramic film and cephalometric comparison of measurements. Materials and Methods Sampling surveyed 82 patients (29 males and 53 females) aged 30-82 years with an average of 50.5 years old and those with loss of teeth from 2 months to 53 years with an average of 18 years. Data records include all proposed species