Introduction: The recent evolution of digital dentistry along with the newly introduced three dimensionally (3D) reproduced models in fixed prosthodontics are infrequent.
Objectives: Was to assess marginal and internal fit of CAD/CAM zirconia crowns constructed by
stone dies versus 3D printed dies.
Materials and methods: A master die was fabricated using typodont maxillary molar tooth. Group (I) Twelve samples poured in type IV dental stone using polyvinyl siloxane (n=12). Group (II) A digital scanning system was utilized to produce a scan of the master die, and the images were transformed into standard tessellation language (STL) files. Three different 3D printers types of (FormLab2, FormLab3, and Asiga) were utilized to yield twelve specimens each (n=36). The specimens were scanned by the digital scanner, followed by fabrication monolithic zirconia crowns and for each group then marginal and internal fit on the master die were analyzed statistically using the silicone replica technique (SRT).
Results: Stone dies and DLP 3D printer exhibited the lower mean value in marginal and internal fit than SLA and LFS with statistically insignificant difference between studied groups.
Conclusions: A slight significant difference was evident for all groups in favor of DLP 3D
printing which had the ability to construct crowns with superior marginal and internal fit
than SLA 3D Printing but within an acceptable clinical range and therefore can possibly be
utilized in a digital workflow to construct fixed dental prostheses.