The impact of abutment type on abutment screw removal torque value after experimental aging.

Purpose: To evaluate the changes in abutment screw removal torque value (RTV) of anatomic, original hybrid, and non-original hybrid abutments after simulated clinical use.

Materials And Methods: Ninety-three implant-abutment-crown specimens were divided into groups according to abutment types (n = 31): anatomic (stock) (A), original hybrid (OH), and non-original hybrid (NOH). After the initial abutment screw tightening, the specimens were subjected to five screw tightening (insertion/removal) cycles, or to 5000 thermal cycles with 500,000 chewing cycles combined with one or five screw tightening cycles.