Marginal Adaptation of Zirconia Implants Frameworks Made by CAD/CAM System

Objectives: The aim of this study was to evaluate the marginal fit of three-unit implant-supported frameworks fabricated with different CAD/CAM systems of the intraoral and extraoral data acquisition.
Methods: Thirty specimens were fabricated using different scanning systems; G1: Cerec Bluecam; G2: iTero, G3: 3S, and 10 specimens were fabricated for conventional method of lost wax casting (Co-Cr). The frameworks were randomized and marginal vertical discrepancy was measured in 3D microscope. The statistical analysis was performed by ANOVA test.
Results: The intra-examiner analysis indicated that there was no statistically significant difference (paired t: 1.563, p=0.120) in the values obtained before and after the analyses. The conventional method demonstrated lowest values of vertical discrepancy (16,58 µm) compared to CAD/CAM systems (20,85 µm) (p<0.001). There was no statistically significant difference in comparison between intra oral and extraoral scanning systems (p=0.319). The Cerec system showed the highest marginal discrepancy (41,76 µm) compared to conventional method and iTero system.
Conclusions: The conventional method showed the lowest misfit compared to CAD/CAM systems analyzed. There was no statistically significant difference between frameworks fabricated by the intraoral and extraoral scanning. All values were maintained within the clinically acceptable limits.