Fig. 1. Processing process of stereolithographic file for location analysis of screw holes. (A) Capture of implant prosthesis occlusion surface manufactured using CAD (DentalCAD; exocad GmbH, Darmstadt, Germany) program. (B) Indication of screw hole center. A quadrant was formed along the outer diameter of the screw hole (blue dotted line), and its center was set to the position of the screw hole (blue dot). (C) The formation of a grid dividing the occlusal surface into nine equal parts. The grid was formed based on the outermost line of buccal, palatal (lingual), mesial and distal boundary of occlusal surface (red dotted line).
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