Purpose: To assess the retention and adaptation of milled and printed denture bases and to compare them to conventional ones.
Materials and methods: A total of 24 completely edentulous patients were selected. For each patient, three maxillary denture bases were constructed. Three groups were defined according to fabrication technique: group I = denture bases were constructed by a conventional technique; group II = denture bases were milled from prepolymerized blocks of polymethyl methacrylate; and group III = denture bases were fabricated by a 3D printing technique. A digital force gauge was used for measuring the retention of the denture bases intraorally, while Geomagic Control X 64 software was used to evaluate the adaptation of the denture bases with their corresponding master casts. Analysis of variance for repeated measures was used for comparison among the groups, followed by pairwise comparison with Bonferroni correction as a post hoc test. The significance level was set at α = .05.
Results: Statistical analysis showed significant differences among the three groups regarding retention and adaptation. The highest values of retention and adaptation of denture bases were found in group II (milling group).
Conclusion: Within the limitations of this study, the following could be concuded: milled denture bases demonstrated better retention and adaptation than the conventional heat-polymerized and the printed denture bases; and printed denture bases showed better adaptation but similar retention to conventional heat-polymerized denture bases.
