Dr. Jong-Ho Lee, a Korean dentist, has patented his design for a free-angled screwdriver and abutment. The system addresses the prosthetic problem of access screw hole placement. The free-angled driver consists of 2 to 3 sections connected using universal joints which allows the unrestricted rotation of the free-angled driver at any angle. The free-angled driver eliminates the need for a straight channel to access the abutment screw. The abutment screw can be screwed and unscrewed using the curved channel up to 30 degrees and 35Ncm.
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