This Video Shows why there is a need for Angle Screw Channel Restorations
Correcting or angling the screw channel leads to simpler and less time consuming treatment, it also allows for easy retrievable screw retained prosthesis in any situation.
This Video Shows why you would use one screw and base (UBH vs BHS) option over the other
This Video Shows the BHS Ti Base and Hygienic Handler and their uses
Video of the patents held #2 is the US Patent for angle screw channel screw and driver connection