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牙齿全部拔除后长时间戴全口义齿,普遍造成牙槽嵴的吸收。而复盖义齿则可保存牙槽嵴。作者选择16名男人,年龄46—47岁,在治疗前前牙为真牙,对拔牙后进行3～5年研究。作者将病人分为二组,一组8名病人,作上颌总义齿及下颌覆盖义齿,下颌保留两个尖牙,经根管治疗后将牙冠磨短至龈上1.5毫米,根管口用银汞充填;二组8名病人,作上下颌总义齿。上下颌前部牙槽嵴垂直向骨吸收是通过在拔牙前,拔牙后三周,一年以后用头颅X线像进行分析,每次照片都在病人下颌休止颌位和口内不戴义齿时拍摄的,每一个病人照7张X线像,采用影片重迭描绘,分析骨
After all the teeth were removed for a long time to wear full denture, generally caused by alveolar ridge absorption. The overdenture can save alveolar ridges. The authors selected 16 men, aged 46-47 years old, with anterior teeth treated as true teeth and 3 to 5 years after tooth extraction. The patients were divided into two groups, a group of eight patients for the maxillary total denture and mandibular overdenture, the mandibular retained two canines, the root canal treatment will be short after grinding the crown to 1.5 mm on the gingival, root canal mouth Silver-mercury filling; two groups of eight patients, for maxillary denture. Vertical absorption of the upper and lower alveolar ridges perpendicular to the bone through the extraction of teeth, three weeks after tooth extraction, a year later with head X-ray analysis, each picture in the patient jaw resting maxillary position and the mouth without dentures when shooting , Each patient according to 7 X-ray images, the use of overlapping film depicting the analysis of bone