Aim: The purpose of this in vitro study was to evaluate if the marginal discrepancy and internal fit of maxillary complex provisional bridge is improved by either 3D printing or CAD/CAM fabrication technique

Methodology: In the present study a total of sixteen samples (Eight in each group) fabricated by two methods using same STL file. Eight samples were fabricated from Telio CAD by Subtractive CAD CAM method (ARUM 5X- 400 Milling machine) (Control group), the other Eight samples were fabricated from HARZ Labs Dental Sand liquid resin by additive 3D printing (Anycubic photon S printer) (intervention group). All samples were tested for marginal gap by Digital microscope and internal fit was tested by silicon replica technique.

Results: It was found that regarding marginal adaptation and internal fit results; no statistically significant difference between the` fabrication methods.

Conclusion: Marginal fit and internal adaptation of (Additive three dimentional printing and Subtractive milling) fabrication techniques were within clinically acceptable ranges.

Clinical implication: Both’ (Additive. and. subtractive) techniques could be used for provisional bridge fabrication