3D打印铝合金种植手术导板准确度的体外评价

目的 在体外树脂模型上设计并模拟种植体植入实验，分析比较一种新型铝合金材质种植导板与传统树脂导板的准确度差异。方法 选取一名肯氏III类牙列缺损患者并制取硅橡胶印模，灌制超硬石膏模型后使用口内扫描仪扫描，设计并打印20个树脂模型。将患者的锥束计算机断层扫描（CBCT）数据导入软件（3Shape Implant Studio 2019）并规划该患者的种植方案，设计种植导板。使用3D打印机分别制作树脂与铝合金材质手术导板各一个。通过全程引导手术将种植体植入模型中，植入后拍摄术后CBCT。在软件中测量术后CBCT图像与原治疗计划图像，在近远中面和唇腭面分析种植体相对于原设计在三维线性以及角度上的准确度差异。结果 种植体在金属导板引导下的线性偏差分别为近中（0.51±0.63）mm，远中（0.49±0.58） mm，唇向（1.14±1.40） mm，腭向（1.15±1.42） mm；垂直向（2.09±0.84） mm。近远中角度和唇腭侧角度的角度偏差分别为（1.41°±0.81°）和（1.78°±1.03°）。种植体在垂直向的偏差与近远中角度、唇腭侧角度偏差与树脂导板引导下的种植体偏差有统计学...

Accuracy of 3D-printed aluminum alloy implant surgical guides:An in-vitro study

Objective This study aimed to analyze and compare the accuracy of a 3D-printed aluminum alloy implant surgical guide and the traditional resin template by designing and simulating implantation experiments on an in-vitro resin model. Methods A patient with Kennedy III dentition defect was selected, and a silicone rubber impression was prepared. A plaster model was molded, and a digital model was obtained with a scanner to print 20 resin models. The patient''s cone beam computed tomography (CBCT) data were imported into the software (3Shape Implant Studio 2019) to design the treatment plan and implant surgical guide. One surgical guide made of resin and one of aluminum were produced using a 3D printer. The implants were placed in the models utilizing a guided procedure. The post-operative CBCT images were acquired and analyzed against the original images in the software to evaluate the difference in the accuracy of the 3D linearity and angularity of the implants in the proximal-distal and labiodistal planes in terms of the original design. Results The implant displacement of group metal surgical guides were (0.51±0.63) mm mesially(M), (0.49±0.58) mm distally(D), (1.14±1.40) mm labially(L), and (1.15±1.42) mm palatally(P); (2.09±0.84) mm vertically (V). The angulation displacement of the mesiodistal angle and the labiopalatal angle was (1.41°±0.81°) (AMD) and (1.78°±1.03°) (ALP). There were statistical differences between the vertical deviation and the mesiodistal, labiopalatal angulation of the implant (P<0.05), and the metal surgical guide showed a higher degree of accuracy. However, there was no significant difference between the two kinds of surgical guides in the mesial and distal directions and the labial and palatal directions. Conclusions The linearity and angulation displacement of the 3D-printed aluminum alloy surgical guide is considced to be within the acceptable range clinical application. Compared with the traditional resin surgical guides, the aluminum alloy template has better surgical vision and heat dissipation ability due to its high strength and structure, which can effectively improve the accuracy and success rate of implant surgery.