Abutment Screw Damage in Press-Fit Implant Systems: A Biomechanical Analysis

Abutment Screw Damage in Press-Fit Implant Systems: A Biomechanical Analysis Using Finite Element Analysis

Abstract:

Press-fit (Morse taper) implant systems are commonly used in dentistry, but abutment screw damage poses a significant concern. This study aimed to elucidate the mechanisms behind this phenomenon using a combined experimental and finite element analysis (FEA) approach. The ANKYLOS implant system served as a model. Experimental testing revealed consistent fracture at the abutment screw thread, coupled with permanent bending deformation of both implants and abutments. These findings were corroborated by FEA simulations, demonstrating that the high torque required for press-fit contact generates substantial stress within the implant components. This stress concentration significantly increases the risk of abutment screw failure, particularly under functional loading. This study provides valuable insights into the biomechanical behavior of press-fit implant systems and underscores the potential for component damage during clinical use.

Keywords: Press-fit implant system, Morse taper, abutment screw damage, finite element analysis, biomechanics, implant failure.