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.

Effect of acidic media on surface characteristics of highly filled flowable resin-based composites: An in vitro study.

Objective: To analyze and compare the impact of acidic media on the surface characteristics of highly filled flowable resin-based composites.

Materials And Methods: Two hundred fifty-six specimens were divided into four groups: GUF (G-aenial Universal Flo), GUI (G-aenial Universal Injectable), TEF (Tetric EvoFlow), and FSF (Filtek Supreme Flowable Restorative). Surface characteristics were analyzed before (T0) and after specimens immersion in different media, such as gastric juice (GJ), fizzy drink (FD), citric juice (CJ), or artificial saliva (AS), for 9 h (T1) and 18 h (T2).