Fig. 6. Scanning electron micrographs of abutment screw surfaces (200 × original magnification): (A) Abutment screw in EH implants before cyclic loading. (B) Abutment screw in EH implants after cyclic loading. (C) Abutment screw in IH implants before cyclic loading. (D) Abutment screw in IH implants after cyclic loading.