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Journal of Aligner Orthodontics



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Journal of Aligner Orthodontics 4 (2020), No. 2     5. June 2020
Journal of Aligner Orthodontics 4 (2020), No. 2  (05.06.2020)


LCD-based DLP printers: a simplified construction compared with conventional 3D printers with projection technology
Krey, Karl-Friedrich / Pfitzner, Sven / Rantzsch, Andreas / Ratzmann, Anja
Background: Three-dimensional (3D) printing has found several applications in dental technology. Printers based on digital light processing (DLP) offer great accuracy, excellent surface properties and a wide range of printing materials. To simplify the construction, the liquid crystal display (LCD)- based printer, a developed version of DLP printers, uses an LCD panel as exposure mask by means of an ultraviolet (UV) light source.
Materials and methods: This study compared 20 standardised test specimens and one working model printed with a conventional DLP printer (projection technology) with models printed using LCD-based technology. The objects were examined microscopically regarding surface properties and peculiarities of the layering and were measured with a digital calliper.
Results: Microscopically, both systems showed excellent surface quality. Small fluctuations in the z-axis were found in the objects printed using the LCD technology. The measurements showed deviations of 0.06 to 0.13 mm from the computeraided design (CAD) construction for both systems.
Conclusions: Printing results of LCD printers were similar to those of DLP printers. Due to its early development stage, further improvements in the mechanical stability and slicer software are required.

Keywords: 3D-printer, accuracy, digital light processing (DLP), LCD