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使用不同钻针作全冠的牙体预备,牙体表面可产生不同形态,它将影响牙与修复体的粘接性,作者对此进行了研究。 本实验收集105颗完好的人离体牙,环氧树脂包埋根部固定,然后保存于100％的湿度中。将样本随机分为3组,并分别以碳化钨裂钻、金刚砂钻、碳化钨磨光钻作牙体制备。3种钻针的锥度、直径尺寸和尖端形态相似。用打磨机上钻针模拟临床全冠牙体预备。完成后保存于蒸馏水中24h,用表面形态测量仪测量样本以下4个参数:①Ra值(平均粗糙度)即均线上不规则
Using different drill needles for full crown preparation, the tooth surface can produce different forms, which will affect the dental and prosthesis adhesion, the authors studied. The experiment collected 105 intact human teeth, epoxy embedded roots fixed, and then stored in 100% humidity. The samples were randomly divided into three groups, respectively, with tungsten carbide crack, diamond, tungsten carbide grinding for tooth preparation. The taper, diameter, and tip morphology of the three types of drill bits are similar. Using a grinding machine to simulate the clinical crown full-crown preparation. After the completion of preservation in distilled water 24h, with the surface morphology measuring instrument to measure the following four parameters of the sample: ① Ra value (average roughness) that are on-line irregular