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Stress analysis of different post-luting systems: a three-dimensional finite element analysis
1King's College London Dental Institute, Denmark Hill Campus, London, United Kingdom. shihab.romeed@kcl.ac.uk
Australian Dental Journal
|February 28, 2013
Summary
Glass fibre posts (GFP) in endodontically treated teeth reduce stress at the post-cement interface, lowering the risk of debonding and fracture compared to metal posts (MP). This improves the biomechanical stability of restored teeth.
Area of Science:
- Biomaterials Science
- Dental Mechanics
- Finite Element Analysis
Background:
- Tooth longevity depends on root canal treatment, coronal seal, and stress distribution.
- Investigating post material and luting cement effects on endodontically treated teeth biomechanics is crucial.
Purpose of the Study:
- To evaluate the biomechanical influence of post material (metal vs. glass fibre) and luting cement on endodontically treated teeth.
- To compare stress distribution and displacement under load using 3-D FEA.
Main Methods:
- 3-D finite element analysis (FEA) of a canine tooth section with metal posts (MP) and glass fibre posts (GFP).
- Testing with four luting cements: zinc phosphate (ZPH), glass ionomer (GI), resin modified glass ionomer (RMGI), and resin based cements (RC).
- Push-out test simulating 100 N perpendicular loading.
Main Results:
- Metal posts (MP) generated significantly higher stresses at the post-cement interface than glass fibre posts (GFP).
- GFP resulted in higher root dentine stresses (7x with ZPH/GI, 3x with RMGI/RC) compared to MP.
- GFP displacement (50 μ) was double that of MP (20 μ).
Conclusions:
- The lower elastic modulus of GFP reduces interface stress, decreasing debonding and fracture risk.
- GFP demonstrates a more favorable biomechanical profile for endodontically treated teeth restoration.
- Post material and luting cement significantly impact the biomechanical behavior and longevity of restored teeth.
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