口扫联合3D打印制备两单位植体模型的精确度研究

Study on the effect of digital scanning combined with 3D printing technology on the three-dimensional position of different inter-implant distances

目的比较口扫联合3D打印制备的不同植体间距的两单位植体模型的精确度。方法首先在3个高仿真的下颌牙列缺失树脂模型上分别植入2颗替代体,要求其中心间距分别为10 mm、20 mm、30 mm,再进行仓式扫描获取数字化模型数据,作为实验的真值。对照组采用开窗式印模及灌注超硬石膏后得到工作模型。实验组采用口扫联合3D打印获得工作模型。最后利用Geomagic Quality 2013进行精确度研究。结果在正确度实验中,当植体间距为10 mm、20 mm时,对照组与实验组所测得的拟合偏差值低于100μm的参考值。在精密度实验中,植体间距为10 mm时测得的拟合偏差值显著优于植体间距为30 mm时测得的拟合偏差值。结论当植体间距在20 mm内时,两组中植体三维位置的精确度均符合临床标准;在植体间距相同的情况下,传统印模技术相比于数字化技术的精确度更高。

Objective To study the accuracy of intraoral scanner combined with 3D printing technology on the three-dimensional position of implants for preparing two unit implant models.Methods Firstly,two implant analogs were implanted into three dentition loss resin models.The distance between the midpoint of the analogs was required to be 10mm,20mm and 30mm respectively,which was taken as the true value of this experiment.Then two groups were divided:In the control group,the silicone rubber impression was taken by the open tray splinted impression technique,and the working model was obtained by super anhydrite pouring.The experimental group used intraoral scanner combined with 3D printer to obtain the working model.Then the Geomagic Quality 2013 was used for the comparative study on accuracy.Results Compared with the test value of 100μm,when the inter-implant distance was 10mm,20mm respectively,the fitting deviation value of implant trueness tests in the control group and the experimental group were lower than the test value.In the precision experiments,the inter-implant distance of 10mm was significantly better than the fitting deviation value measured when the inter-implant distance was 30mm.Conclusion When the inter-implant distance is within 20mm,the accuracy of traditional impression technology and digital technology meet the clinical requirements.Under the condition of the same inter-implant distance,the accuracy of traditional impression technology is higher than that of digital technology.