Int J Oral Maxillofac Implants. 2020 Sep/Oct;35(5):931-938. doi: 10.11607/jomi.8186.
This study aimed to evaluate the effect of different surgical guide manufacturing techniques on the accuracy of the surgical guides produced prior to implant placement.
Three type of guides were compared: milled guides using a commercial milling unit (C-Mill), printed guides using a commercial 3D printer (C-Print), and printed guides using a benchtop printer (B-Print). All the guides were fabricated on a single maxillary model for anterior implant and posterior implant placement. Ten guides were produced for each group. Four accuracy variables were measured: (1) internal accuracy, (2) vertical fit, (3) guide seating distortion, and (4) drilling access horizontal and vertical deviations. All the variables were virtually measured by 3D rendering software. The Kruskal-Wallis and the Mann-Whitney U tests were conducted to evaluate the significance of the differences among the guide groups.
The C-Mill guides were significantly more accurate than the other guide groups for all the accuracy variables (P < .05). The C-Print group tended to show greater accuracy than the B-Print group, except for guide seating distortion and horizontal deviation of drilling access. However, a significant difference between the C-Print and B-Print groups was observed only for the vertical deviation of the posterior drilling access (P < .05). The location of the implant seemed to have minimal influence on the drilling access accuracy, except for the vertical deviations of C-Mill and C-Print guides, where the anterior site was associated with significantly (P < .05) greater errors than the posterior site.
Producing guides by milling was more accurate and less vulnerable to seating distortion in comparison to printing. Despite the overall similarity between the two printers, the commercial printer tended to produce guides with greater accuracy than the benchtop printer.
本研究旨在评估不同手术导板制造技术对种植体植入前制作的手术导板准确性的影响。
比较了三种类型的导板：使用商业铣床（C-Mill）铣削的导板、使用商业 3D 打印机（C-Print）打印的导板和使用台式打印机（B-Print）打印的导板。所有导板均在单个上颌模型上制作，用于前牙种植体和后牙种植体植入。每组制作了 10 个导板。测量了四个准确性变量：（1）内部准确性、（2）垂直拟合、（3）导板就位变形和（4）钻孔入口水平和垂直偏差。所有变量均通过 3D 渲染软件进行虚拟测量。采用 Kruskal-Wallis 和 Mann-Whitney U 检验评估导板组之间差异的显著性。
对于所有准确性变量，C-Mill 导板明显比其他导板组更准确（P <.05）。C-Print 组的准确性倾向于高于 B-Print 组，除了导板就位变形和钻孔入口的水平偏差。然而，仅在后牙钻孔入口的垂直偏差方面观察到 C-Print 和 B-Print 组之间存在显著差异（P <.05）。种植体的位置似乎对钻孔入口的准确性影响最小，除了 C-Mill 和 C-Print 导板的垂直偏差，其中前牙部位与后牙部位相比，误差显著（P <.05）。
与打印相比，铣削制作导板更准确，且不易发生就位变形。尽管两种打印机总体上相似，但商用打印机生产的导板准确性往往高于台式打印机。
