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1 患者情况:共用钉固位技术治疗63名患者74颗牙齿。患者年龄15～50岁,平均27岁。其中男34人,女29人。适应证:前牙切角缺损制备Ⅳ类洞困难者,后牙边缘嵴缺
1 Patient's condition: A total of 74 teeth were treated in 63 patients with a common nail retention technique. Patients aged 15 to 50 years, an average of 27 years old. There are 34 males and 29 females. Indications: anterior incision angle defect preparation class Ⅳ hole, posterior edge of the lack of ridge