北京大学学报(医学版) ›› 2022, Vol. 54 ›› Issue (1): 187-192. doi: 10.19723/j.issn.1671-167X.2022.01.030
WANG Juan1,YU Hua-jie1,SUN Jing-de2,QIU Li-xin1,△()
摘要:
目的: 比较传统夹板式印模和利用预成刚性连接杆系统进行无牙颌种植固定修复印模制取的操作复杂程度及精度差异。方法: 制备带有6颗种植体替代体的下颌无牙颌标准模型,种植体植入位置平齐骨面,在种植体替代体上连接多牙修复基台。对照组采用传统开窗夹板式印模技术制取印模,在多牙修复基台上连接转移杆,使用聚甲基丙烯酸甲酯材料制作夹板,并制取开窗印模。试验组采用刚性连接杆系统制取开窗印模,在多牙修复基台上连接临时修复套筒,根据种植体间距,选择合适长度的预成刚性连接杆,使用少量聚甲基丙烯酸甲酯材料将套筒和预成刚性连接杆固定,制取开窗印模。实验组和对照组各重复6次印模制取,比较试验组和对照组的印模制取耗时差异。在制取的印模上连接基台替代体,灌制石膏模型,并使用模型扫描仪将石膏模型和标准模型转化为三角网格数据文件。将试验组和对照组模型分别与标准模型进行精度差异测量,比较两种印模方法获得模型的精度差异。结果: 在标准模型上进行印模制取,试验组用时显著低于对照组,两者差异有统计学意义[(984.5±63.3) s vs. (1 478.3±156.2) s, P<0.05]。与标准模型相比,在种植体基台处,试验组制取印模灌制模型均方根误差(root mean aquare,RMS)与对照组模型基本相同,两者差异无统计学意义[(16.9±5.5) μm vs. (20.2±8.0) μm, P>0.05]。结论: 预成刚性连接杆可以简化无牙颌种植即刻固定修复的印模流程,节约椅旁操作时间,获取的印模精度与传统印模技术无显著差异,值得在临床推广使用。
中图分类号:
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