Effect of the Coronal Wall Thickness of Dental Implants on the Screw Joint Stability in the Internal Implant-Abutment Connection

Impact of Intentional Overload on Joint Stability of Internal Implant‐Abutment Connection System with Different Diameter

“…Reverse torque loss of the abutment screw under an 800 N static load was largest in Ø 4.0 diameter implants (86%). Several recent studies reported contradicting results of preload loss along with axial displacement after loading . One study reported no significant difference of reverse torque value after loading test .…”

“…The implant and abutment complex was assembled with an abutment screw using a digital torque gauge (SERIES TT03; Mark‐10 Inc., New York, NY) with 30‐Ncm tightening in 10‐minute intervals following the manufacturer's recommendation. The implant was securely fastened in a friction grip vise 3 mm below the implant platform to simulate the bone loss, and a metal cap was engaged on the abutment to simulate the clinical crown (Fig ) . The measuring area of the implant/abutment complex was protected by the metal cap or vise to avoid any change during loading cycles.…”

“…Adequate fracture resistance has been reported even under overloading condition in ICC systems . Nevertheless, implant‐supported single prostheses in posterior regions could be exposed to occlusal overload and have been reported to have a higher risk for mechanical complications . Excessive occlusal loading might further increase the wedge effect of the abutment, inducing more axial displacement, which might lead to potential loss of occlusal contact.…”

“…Implant diameter could also affect the screw joint stability . Lower preload loss of abutment screw has been reported with wide diameter ICC implants.…”

“…The thicker implant coronal wall thickness has been reported to reduce the stress concentration on the implant/abutment interface, potentially reducing elastic deformation . Other than finite element analysis, the effect of different wall thicknesses on screw joint stability has been evaluated in experimental implants only, which has limitations in comparison with commercially available implants . The evaluation of the wedge effect might suggest a better clinical understanding of the nature of biomechanical complication or failure of the implant prosthesis.…”