Comparative accuracy analysis of denture bases fabricated by DLP and LCD 3D printing technologies

(digital dentistry) ., 3 (3D printing) , , [1-3].3D (additive manufacturing) , computer-aided design (CAD) . , , , [4]. , , (wax-up), (processing), (polishing) , [5]., (shrinkage) (retention), (support), (stability) . Purpose: To evaluate and compare the dimensional accuracy of maxillary denture bases fabricated using digital light processing (DLP) and liquid crystal display (LCD) 3D printing technologies with the same materials and standardized printing parameters.Methods: A standard edentulous maxillary model was used to design a computer-aided de- sign (CAD)-based denture base, which was then printed using DLP (Asiga Pro 4K, 10 specimens) and LCD (UNIZ NBEE, 10 specimens) printers.After post-processing, all specimens were scanned and analyzed using Geomagic Control X. Dimensional accuracy was assessed by calculating the root mean square (RMS) deviation between the printed and reference CAD data.Data were analyzed using Welch's t-test (=0.05).Results: RMS values were significantly lower in the LCD group (98.303.41m) than in the DLP group (166.5924.18m) (p<0.001),indicating superior geometric fidelity.Color difference maps revealed consistent accuracy across the LCD-printed surfaces, whereas DLPprinted samples showed distortion in margin and palatal regions. Conclusion:Under standardized conditions, the LCD printing method demonstrated higher dimensional accuracy and consistency than the DLP method, suggesting its relative clinical suitability for complete denture fabrication.