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Updated: Jul 15, 2026
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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
Different bone loading patterns due to fixation of three-unit and five-unit implant prostheses.
M Karl1, W Winter, A J Dickinson
1Department of Prosthodontics, School of Dental Medicine, The University of Erlangen-Nuremberg, Germany.
Australian Dental Journal
|May 16, 2007
Summary
Finite element analysis (FEA) simulated bone loading for implant-supported fixed partial dentures (FPDs). Results showed comparable bone loading for three- and five-unit FPDs, suggesting multi-implant configurations compensate for strain development.
Area of Science:
- Biomaterials Science
- Dental Implantology
- Finite Element Analysis (FEA)
Background:
- Passive fit is crucial for implant prostheses.
- This study used FEA to simulate bone loading from three- and five-unit implant-supported fixed partial dentures (FPDs).
Observation:
- In vivo strain measurements were taken using strain gauges on pontics.
- Six FPD groups were fabricated, supported by two or three implants.
- Three-dimensional FEA models were created based on in vivo data, representing results as von Mises equivalent stress.
Findings:
- Mean strain values ranged from 15 to 170 microstrain for three-unit FPDs and 32 to 302 microstrain for five-unit FPDs.
- FEA indicated von Mises stresses up to 30 MPa in cortical bone and 5 MPa in trabecular bone.
- Comparable bone loading magnitudes were observed for both three- and five-unit FPDs.
Implications:
- Multi-unit prostheses may have higher inaccuracies than single restorations.
- Multi-implant configurations appear to compensate for increased strain development by avoiding moment loading.
- FEA provides valuable insights into biomechanical behavior of implant-supported FPDs.
