3D打印多单位固定桥蜡型熔模基底冠适合性研究

［摘要］目的 分析与探讨3D打印制作多单位固定桥基底冠熔模蜡型的适合性。方法 统一制作相同前牙6个单位固定桥模型50个, 随机分成两组，其中实验组25个，对照组25个。实验组用3D打印制作基底冠树脂蜡型，对照组用传统手工浸蜡方式制作基底冠蜡型。采用扫描电镜比较基底冠与模型的密合性，每个模型取4点，分别为固定桥两端基牙的唇侧、舌侧边缘，同时对两组金属基底冠就位与外形修整技师所耗时间进行比较。 结果 3D打印制作的多单位前牙固定桥其基底冠的稳定性、适合性均优于传统手工浸蜡法，并可以显著缩短技师操作时间。 结论 3D打印制作固定桥熔模蜡型具有良好的适合性和稳定性，值得在口腔修复工艺中应用与推广。

Study on the suitability of 3D Printing multi-unit fixed-bridge base crown

Abstract: Objective To analyze and explore the 3D Pring to make the multi-unit fixed bridge base .Methods A total of 50 fixed bridge models were uniformly made. Each model is composed of 6 units in the same anterior teeth area. The models were randomly divided into two groups, the experimental group (n=25) and the control group (n=25). The base crown wax model in the experimental group was designed and made with the 3D Pring, the control group with the traditional manual method. Scanning electron microscope (500x magnification) was used to compare the interdigitation of the base crown with the model. Four points were taken from each case, which was the labial and lingual edges of the abutment teeth at both ends of the fixed bridge, respectively. In addition, the time spent by two groups of metal base crown dressing technicians in placement and appearance dressing was compared.. Results The stability and interdigitation of multi-unit anterior fixed bridge base crowns made and designed with the 3D Pring were better than those of traditional manual methods, and the technicians' operation time could be shortened. Conclusion The fixed bridge base casting wax models with the 3D Pring design and making have good compatibility and stability, and it can be in application and promotion in prosthodontic technology.