“…The control group with 4 coils was selected referring to a study conducted by Othman et al who found that comparing between the conventional laboratory fabricated springs with the CAD/CAM methods had a significant difference for material as well as design comparing compression to force ratio. The design with 4 coil numbers and variable wire thickness directly affects the mechanical properties for printable orthodontic resins and exhibit that CAD/CAM orthodontic springs can be printed and mechanically tested in order to bring out a new treatment possibility in orthodontics using the 4 coils springs design [15].…”