3D打印树脂种植工作模型尺寸稳定性对替代体复制精度影响的初步研究

ObjectiveThis study aimed to investigate the influence of the dimensional stability of 3D printed resin master model on the replication accuracy of implant replicas.MethodsTen digital impressions of patients undergoing continuous crowns or fixed bridge restoration supported by two implants were obtained, and resin models with implant replicas were 3D printed. Scanning rods were fixed on the replicas 3, 7, and 14 days after printing. The 3D, linear, and angular deviations of the scanning rods at different times were analyzed through Geomagic Wrap 2021 software.ResultsThe position of the replicas shifted mesiolingually, in the same direction as the shrinkage of the model. From day 7 onward, the 3D, distance linear, and angular deviations of the replicas (scanning rod) significantly increased compared with those on the 3rd day (P<0 .05). on the 14th day, the changes were even more pronounced, with the above deviations showing statistical significance (P<0 .05) compared with those for the 3-day and 7-day groups. no statistical difference in height linear deviation was observed among the groups.ConclusionThe insufficient dimensional stability of 3D printed resin models can lead to changes in the relative position and angle of the replicas, thereby affecting the accuracy of the replicas in recreating the implant’s position. Complete manufacturing of prosthesis is recommended within 7 days after the model is printed.