Fig. 6

The occlusal level difference is calculated in the following steps: A Standard Tessellation Language (STL) files of the initial (containing the provisional restoration design) and the second intraoral scans are imported into the Control X software. B Two scan files are superimposed onto each other by the software’s initial and best fit features. C, D A plane roughly crossing the central groove of the virtual restoration (and parallel to its access hole axis) is constructed by the “3 position” feature of the software. E, F A 2D cross-section of the plane is generated, and the occlusal level difference is measured between the middle points of the designed and actual crowns