Abstract: 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.

Key words: fixed bridge base crown, 3D Pring, casting wax model, compatibility