Introduction: Surgical guides are used to allow implant placement in a prosthetic-driven manner. Forces applied to the guides during surgery were argued to cause implant displacement from the planned position. That may cause failure of implant or injury to important structures. Moreover, the magnitude of force could have a great influence on implant deviation.
Aim of the study: Evaluate the effect of different forces magnitude in implant angular and depth deviation.
Material and methods: Ten epoxy resin models were used. For each model, a surgical guide with two sleeves was designed and printed. Surgical guides were fitted to the models, then they were attached to a testing platform to allow the application of forces. For each sleeve, eight forces were applied from two directions. For each direction, four forces were applied (0.1N,1N,2.5N, and 5N). After force application, surgical guides were scanned. Superimposition was made to detect the suspected implant position after force application. Vertical and angular implant deviation was measured from the planned implant position.
Results: Vertical and angular deviations increased significantly with increasing force magnitude. Vertical deviation for 0.1N, 1N, 2.5N, and 5N forces was (0.30± 0.22mm, 0.5±.043mm, 0.65±0.58mm,0.81±0.69mm, P