Department of Materials Science and Technology/Futurum Innovation, Faculty of Odontology, Malmö University.
Dent Mater J. 2021 Mar 31;40(2):339-347. doi: 10.4012/dmj.2020-039. Epub 2020 Oct 24.
The purpose of the study was to evaluate the accuracy: trueness and precision of photopolymers used for dental models and surgical guides printed with two different digital light processing (DLP) printers. Forty specimens of four materials; E-dentstone, E-shell, NextDent™ Model, NextDent™ SG, and two designs; models A and B (n=5), were manufactured (DDDP, EvoDent). Trueness was evaluated by comparing values for 26 parameters with the CAD models' reference values and precision through standard deviation. The trueness and precision were higher for linear than for angle parameters. X- and Y-axes showed higher trueness than Z-axis and model B higher trueness than model A. The conclusions are; the accuracy is dependent on the design of the object. The linear precision appears to be high. The highest trueness was observed for a surgical guide polymer (NextDent™ SG). The definition of clinically relevant accuracy and acceptable production tolerance should be evaluated in future studies.
本研究旨在评估两种不同数字光处理（DLP）打印机所打印的牙科模型和手术导板用光聚合材料的准确性：准确度和精密度。使用两种不同的数字光处理（DLP）打印机（DDDP、EvoDent），分别为 4 种材料（E-dentstone、E-shell、NextDentTM Model、NextDentTM SG）的 40 个样本（n=5）制作了 A 和 B 两种设计（模型 A 和模型 B）的试件。通过比较 26 个参数与 CAD 模型参考值的差异来评估准确度，通过标准偏差来评估精密度。线性参数的准确度和精密度均高于角度参数。X 轴和 Y 轴的准确度均高于 Z 轴，模型 B 的准确度高于模型 A。结论是：准确性取决于物体的设计。线性精度似乎很高。手术导板用聚合材料（NextDentTM SG）的准确度最高。未来的研究应评估临床相关准确性和可接受的生产公差的定义。
