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Poster De Conférence Année : 2024

Optimisation strategies of different VAT photopolymerization printers

Résumé

Objective: This study aims to assess the accuracy of dental arch models printed with different vat photopolymerization technologies SLA (stereolithography), DLP (digital light processing) and LCD (liquid crystal display) while considering different resin types and layer thicknesses. Materials and methods: Based on a STL file of a dental arch, 80 models were printed flat on the build plate using the specific resins from a SLA printer (Draft V2 (DR) and Grey V4 (GR) resin on Form 3+ Auto, Formlabs), a DLP printer (printed with different resin (Die and model 2 (DM) on Pro95S, SprintRay), a LCD printer (Aqua-Gray (AG) on Sonic Mini 8Ks, Phrozen) and according to the different layer thicknesses recommended by the manufacturer for each resin. The production time (printing and post-processing) of 10 models printed with the same resin and layer thickness was recorded. The STL files of the printed models were obtained after scanning with the highest precision program of a desktop scanner. A same mesh processing of the 80 STL files and the initial STL file was performed for better comparison. Accuracy was assessed as the area of valid distance between the STL of a printed model and the initial STL file following a best fit comparison with a 3D analysis software (Zeiss Inspect). Results: The production time was the fastest with the DLP printers. Only the resin DR200 (Draft V2 resin printed with a layer thickness of 200μm) had an equivalent production time as DM100 (Die and model resin printed with a layer thickness of 100μm). Accuracy amongst the different printed models for a specific resin and a given thickness layer significantly increases according to the following sequence: AG50 < DM50 < DM170 < DM100 = DR100 = DR200 = GR100 < GR50. Conclusion: A SLA printer has the best accuracy over the DLP and LCD. It’s possible that hardware of the vat photopolymerization technologies may explain the differences in accuracy. Clinical relevance: Within a dental laboratory seeking to optimise both accuracy and efficiency, mass printing of models with a layer thickness of 200μm on an automated SLA printer can be recommended.
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Dates et versions

hal-04637460 , version 1 (06-07-2024)

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  • HAL Id : hal-04637460 , version 1

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Timothy Fasham, Philippe Francois, Lebon Nicolas, Floriane Laverne. Optimisation strategies of different VAT photopolymerization printers. Journée de la Recherche en Odontologie, Jul 2024, Montrouge, France. , 2024. ⟨hal-04637460⟩
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