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853 to 0.990 for the FDM and DLP techniques, respectively. This indicated an excellent agreement. No statistically significant differences could be detected between the 3D-printed models and their corresponding plaster models. The overall mean difference was -0.11 mm and 0.00 ranging from -0.49 to 0.17 mm and from -0.42 to 0.50 mm, for the FDM and DLP techniques, respectively. The accuracy of the 3D models produced by the DLP and FDM techniques was acceptable. However, for the fabrication of clear aligners, the optimum fit of the prod