IADR Abstract Archives
3D Finite Element Analysis of one-piece and two-pieces implant abutment
Objectives: To investigate the maximum von Mises stress, stress distribution pattern and stress accumulation between one-piece and two-pieces implant abutment, supported single crown in posterior region.
Methods: Dental implant (4.5 mm in diameter and 11.5 mm in length), with two different implant abutments i.e., rigid abutment (one-piece) and transfer abutment (two-pieces), mandibular bone and crown were modeled with geometric data by using SolidWorks software. ANSYS software was used for finite element analysis. Combined load (vertical 200 N and horizontal 40 N) was applied at functional area with 1 Hz for 5 seconds.
Results: The patterns of stress distribution in both models were similar, e.g. the maximum von Mises stresses were observed at the first thread of the implant fixture, and at the marginal bone contact area with the first thread of implant. And the stress was concentrated at the implant fixture-abutment screw interface. The maximum von Mises stress of two-pieces abutment was lower when compared with the one-piece abutment in most of components i.e., abutment screw, abutment and crown components, with a continuous stress distribution pattern to the bone. The stress accumulation was less in the implant fixture and the stress in the abutment screw was distributed continuously with less stress concentration, whereas in one-piece abutment, the stress was obviously concentrated at the abutment screw.
Conclusions: A transfer abutment could provide better biomechanics than a rigid abutment.
Methods: Dental implant (4.5 mm in diameter and 11.5 mm in length), with two different implant abutments i.e., rigid abutment (one-piece) and transfer abutment (two-pieces), mandibular bone and crown were modeled with geometric data by using SolidWorks software. ANSYS software was used for finite element analysis. Combined load (vertical 200 N and horizontal 40 N) was applied at functional area with 1 Hz for 5 seconds.
Results: The patterns of stress distribution in both models were similar, e.g. the maximum von Mises stresses were observed at the first thread of the implant fixture, and at the marginal bone contact area with the first thread of implant. And the stress was concentrated at the implant fixture-abutment screw interface. The maximum von Mises stress of two-pieces abutment was lower when compared with the one-piece abutment in most of components i.e., abutment screw, abutment and crown components, with a continuous stress distribution pattern to the bone. The stress accumulation was less in the implant fixture and the stress in the abutment screw was distributed continuously with less stress concentration, whereas in one-piece abutment, the stress was obviously concentrated at the abutment screw.
Conclusions: A transfer abutment could provide better biomechanics than a rigid abutment.