International Journal of Computerized Dentistry, Pre-Print
Schubert, Oliver / Edelhoff, Daniel / Erdelt, Kurt-Jürgen / Nold, Ephraim / Güth, Jan-Frederik
Seite 1 – 25
Aim: Milling-based, subtractive fabrication of digital complete dentures represents the computer-engineered manufacturing method of choice, but efficient additive manufacturing technologies might prove beneficial for the indication as well. The aim of this study is to evaluate the accuracy of surface adaptation of complete denture bases fabricated using subtractive, additive, and conventional manufacturing techniques.
Materials and methods: A standardized edentulous maxillary model was digitally designed and milled. 12 duplicated plaster casts were scanned, and virtual denture bases were designed accordingly. Physical complete denture bases (n=12/technique) were manufactured applying different digital and conventional fabrication strategies. 1) CNC milling (MIL), 2) material jetting (MJ), 3) selective laser sintering (SLS), and 4) digital light processing technology (DLP). 12 denture bases produced by injection molding (INJ) served as control. The intaglio surfaces of the denture bases were digitized, superposed with the surface data of the casts using a best-fit algorithm, and accuracy of surface adaptation was assessed examining deviations. Statistical analysis was conducted using SPSS (p < 0.05).
Result: 23 Milling of denture bases lead to significantly better surface adaptation compared to all other technologies (p < 0.001). The remaining fabrication methods, including conventional manufacturing of denture bases, revealed no considerable overall differences.
Conclusions: All technologies investigated are adequate to produce complete denture bases regarding surface adaption, whereas milled denture bases present superior surface adaptation.