Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an, 710004, China.
Department of Digital Oral Implantology and Prothodontics, College of Stomatology, Xi'an Jiaotong University, Xi'an, 710004, China.
Int J Implant Dent. 2024 Oct 15;10(1):44. doi: 10.1186/s40729-024-00561-y.
To demonstrate the viability of a coordinate-measuring machine (CMM) for the geometric analysis of 3D printed surgical templates.
The template was designed and modified by adding 18 cylindrical landmarks for CMM test and then classified into five groups according to the slicing software and resins (opaque and transparent): Streamflow-O, Streamflow-T, Shapeware-T, Rayware-T and Polydevs-T (N = 3). Three standing times (0 w, 1 w, and 2 w) were included to observe possible deformation. All the measurements were performed automatically by the CMM through a preset program. The Euclidian distance (dxyz) was regarded as the representation of global dimension accuracy, and displacements in the x-, y-, and z-axes were also calculated.
The average dxyz values of Streamflow-O, Streamflow-T, Shapeware-T, Rayware-T and Polydev-T are 32.6 μm, 31.3 μm, 56.4 μm, 96.4 μm, and 55.3 μm, respectively. Deviations were mainly induced by the upward bending of the free end region (positive direction of the z-axis). Different resins did not have a significant influence on the dimensional accuracy. Moreover, deformation appeared to be negligible after 2 weeks of storage, and the z-axis displacements were only approximately 30 μm at week 1 and 10 μm at week 2.
The deviations of the DLP-printed template are induced mainly by z-axis displacements and are determined by the processing accuracy. After 2 weeks, the dimensional stabilities of these templates are reliable, which is encouraging for clinicians. Moreover, the CMM is preliminarily demonstrated to be a feasible tool for achieving automated geometric analysis of surgical templates.
展示三坐标测量机（CMM）在 3D 打印手术模板的几何分析中的可行性。
通过在模板上添加 18 个圆柱形标志点进行 CMM 测试，并根据切片软件和树脂（不透明和透明）将模板分为五组：Streamflow-O、Streamflow-T、Shapeware-T、Rayware-T 和 Polydevs-T（N=3）。包括三个静置时间（0 w、1 w 和 2 w），以观察可能的变形。所有测量均通过 CMM 通过预设程序自动进行。欧几里得距离（dxyz）被视为整体尺寸精度的代表，同时还计算了 x、y 和 z 轴的位移。
Streamflow-O、Streamflow-T、Shapeware-T、Rayware-T 和 Polydev-T 的平均 dxyz 值分别为 32.6μm、31.3μm、56.4μm、96.4μm 和 55.3μm。偏差主要是由自由端区域的向上弯曲（z 轴的正方向）引起的。不同的树脂对尺寸精度没有显著影响。此外，2 周储存后变形似乎可以忽略不计，z 轴位移在第 1 周约为 30μm，在第 2 周约为 10μm。
DLP 打印模板的偏差主要是由 z 轴位移引起的，由加工精度决定。2 周后，这些模板的尺寸稳定性可靠，这对临床医生来说是令人鼓舞的。此外，初步证明 CMM 是实现手术模板自动几何分析的可行工具。
