Effect of crown retention systems and loading direction on the stress magnitude of posterior implant-supported restorations: A 3D-FEA

João Paulo M. Tribst*, Niek de Jager, Amanda M.O. Dal Piva, Cees J. Kleverlaan, Albert Feilzer

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

This study aimed to investigate the effect of four retention systems for implant-supported posterior crowns under compressive loading using three-dimensional finite element analysis. A morse-taper dental implant (4.1 × 10 mm) was designed with Computer Aided Design software based on non-uniform rational B-spline surfaces. According to International Organization for Standardization 14,801:2016, the implant was positioned at 3 mm above the crestal level. Then four models were designed with different crown retention systems: screw-retained (A), cement-retained (B), lateral-screw-retained (C), and modified lateral-screw-retained (D). The models were imported to the analysis software and mesh was generated based on the coincident nodes between the juxtaposed lines. For the boundary conditions, two loads (600 N) were applied (axial to the implant fixture and oblique at 30°) totaling 8 conditions according to retention design and loading. The von-Mises stress analysis showed that different retention systems modify the stress magnitude in the implant-supported posterior crown. There is a similar stress pattern in the implant threads. However, models C and D presented higher stress concentrations in the crown margin in comparison with A and B. The oblique loading highly increased the stress magnitude for all models. In the simulated conditions, part of the stress was concentrated at the lateral screw under axial loading for model C and oblique loading for model D. The results indicate a possible new failure origin for crown retained using lateral screws in comparison to conventional cement-retained or screw-retained systems.

Original languageEnglish
Article numbere28129
Pages (from-to)1-13
Number of pages13
JournalHeliyon
Volume10
Issue number6
Early online date14 Mar 2024
DOIs
Publication statusPublished - 30 Mar 2024

Bibliographical note

Publisher Copyright:
© 2024 The Author(s)

Keywords

  • Crowns
  • Dental abutments
  • Dental implants
  • Finite element analysis
  • Prosthodontics

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