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根管治疗后的牙体修复常先做成复合树脂桩核,再作全冠。然而桩钉在树脂核内的位置与根尖应变量的关系尚不知晓。 材料和方法 选择长度、根径相似的20颗新近拔出的、完整的下颌第一双尖牙,随机分为相等的甲、乙两组。每颗牙行根管治疗后,于邻面距根尖6mm处粘应变片,将牙根垂直固定于丙烯酸树脂块内,保持湿润,垂直加载200N,重复10次取平均应变量(未修复期)。于牙冠部覆盖聚乙烯硅酮制作记录导板(记录原
After the root canal treatment of dental restoration often made composite resin post core, and then for the crown. However, the relationship between the position of the pile nail in the resin nucleus and the apical strain is not known. MATERIALS AND METHODS Twenty newly extracted and intact mandibular first bicuspid teeth of similar length and root diameter were randomly divided into equal groups A and B. After root canal treatment of each tooth, the gingival strain was adhered 6mm away from the apical face, the root was fixed vertically in the block of acrylic resin, kept moist, loaded vertically 200N, repeated 10 times the average strain (unrepaired) . The crown covered with polyethylene silicone recording guide (original record