Joda T Matthisson L Zitzmann NU 2020 The aim of this in vitro study was to analyze the impact of model aging on the accuracy of 3D-printed dental models. A maxillary full-arch reference model with prepared teeth for a three-unit fixed dental prosthesis was scanned ten times with an intraoral scanner (3Shape TRIOS Pod) and ten models were 3D printed (Straumann P-Series). All models were stored under constant conditions and digitized with a desktop scanner after 1 day; 1 week; and 2, 3, and 4 weeks. For accuracy, a best-fit algorithm was used to analyze the deviations of the abutment teeth (GFaI e.V Final Surface®). Wilcoxon Rank Sum Tests were used for comparisons with the level of significance set at α = 0.05. Deviation analysis of the tested models showed homogenous intragroup distance calculations at each timepoint. The most accurate result was for 1 day of aging (3.3 ± 1.3 µm). A continuous decrease in accuracy was observed with each aging stage from day 1 to week 4. A time-dependent difference was statistically significant after 3 weeks (p = 0.0008) and 4 weeks (p < 0.0001). Based on these findings, dental models should not be used longer than 3 to 4 weeks after 3D printing for the fabrication of definitive prosthetic reconstructions. application/pdf https://sonar.ch/global/documents/93518 eng info:eu-repo/semantics/altIdentifier/doi/10.3390/jcm9051436 info:eu-repo/semantics/altIdentifier/pmid/32408618 info:eu-repo/semantics/openAccess Journal of clinical medicine. - 2020 3D printing accuracy dental materials science digital workflow rapid prototyping Impact of Aging on the Accuracy of 3D-Printed Dental Models: An In Vitro Investigation. http://purl.org/coar/resource_type/c_6501