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Objective: To compare the marginal fit and internal adaptation of novel additively manufactured (3D printed) ceramic filled hybrid composite definitive crowns and milled monolithic zirconia milled crowns. Materials & Methods: A single die STL file was used to create a congruent base with 6 points of reference using Ivoclar’s CAM 5 software and milled. Fourteen samples were manufactured for each group (n=14): milled zirconia (MI) and printed (PR). The e.max ZirCAD crowns were milled and sintered using a fast-sintering protocol. The VarseoSmile Crown Plus crowns were printed using a Sprintray 3D DLP printer. The crowns of both groups were ‘cemented’ using ultra-light body PVS to replicate the misfit space using a standard load. Dual scan protocol was used to digitize the misfit space and saved as STL files. Geomagic Control X 2020 was used to assess the misfit of the marginal gap (MG), Occlusal surface (OC) and axial surface (AX) of each sample in both groups. A statistical software program (IBM SPSS Statistics) was used to calculate the means and standard deviations of the internal (AX and OC) and marginal discrepancies (MG) for each group. Normality distribution was confirmed and assumption of equality of variances was tested using Levenè’s test. Since the data was not normally distributed and Levenè’s test was significant, a non-parametric Mann-Whitney Test was used to analyze the data. Results: The mean marginal gap (MG) between the two groups was not found to be statistically significant (p>0.05). The mean discrepancy in the internal adaptation at the axial surface (AX) and occlusal surface (OC) was found to be higher in the PR group compared to the MI group. This difference was statistically significant for both AX and OC measurements. Discussion and Conclusion: 3D printed VarseoSmile Crown Plus crowns have similar marginal fit when compared to milled e.max ZirCAD zirconia crowns. However, the milled e.max ZirCAD zirconia crowns showed improved internal adaptation when compared to the 3D printed VarseoSmile Crown Plus crowns. |
