Abutment Rotational Displacement of External Hexagon Implant System Under Lateral Cyclic Loading

Abstract

Within the limits of this in vitro study, the RD of the external hexagon joint components occurred significantly under eccentric lateral loading when compared to centric loading. The displacement increased significantly with longer period of eccentric lateral loading.

Fatigue induced changes in conical implant–abutment connections

“…In the oral cavity they have to resist dynamic forces [3][4][5][6] and morse taper (conical) implant-abutment connections (IAC) have proven to be more fatigue resistant to mechanical loading [1,2,[7][8][9][10][11][12]. Nevertheless technical failures like veneer chipping orfracture, screw-or abutment loosening as well as implant fractures have been reported amounting up to 30-41% within 5 years [13][14][15][16][17].…”

Bacterial Leakage Along the Implant-Abutment Interface

“…Reports by Steinebrunner et al (2005) indicate that bacterial penetration between implants and abutments connected by screws varies according to the number of loading cycles applied to the abutment. The leakage of microorganisms and fluids to the inner parts of the implants is considerably increased by load application, which generates micro-movements and interfacial gaps (Khraisat et al, 2006). Bacterial species harboring the internal surfaces of the implants and components is not surprising, since the size of oral bacterial species ranges in average from 1.1 to 1.5 µm in length and 2 to 6 µm in diameter.…”

Experimental conical‐head abutment screws on the microbial leakage through the implant‐abutment interface: an in vitro analysis using target‐specific DNA probes

“…The number, shape, and size of the gaps may vary according to the implant systems and types of platform connection (Khraisat et al 2006;Assunc ßão et al 2009). Commonly, interface designs of screw-retained connections can be classified as external or internal connections, and can incorporate features to rotational resistance, indexing, lateral stabilization, and other mechanisms to minimize the risk of movements and screw loosening.…”