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Temperature Dependent Deformation

Temperature Dependent Deformation

In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...

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Updated: Jul 17, 2026

In situ Compressive Loading and Correlative Noninvasive Imaging of the Bone-periodontal Ligament-tooth Fibrous Joint

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Structural behaviour of endodontically treated teeth under thermomechanical loading.

K Genovese¹, L Lamberti, C Pappalettere

¹Dipartimento di Ingegneria e Fisica dell'Ambiente, Università della Basilicata, Potenza, Italy.

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine

|January 24, 2007

Summary

Composite posts are more effective than metal posts in endodontically restored teeth under combined thermal and chewing loads. Performance varies without chewing, depending on thermal exposure time.

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Area of Science:

Biomaterials Science
Dental Materials
Biomechanics

Background:

Selecting optimal post and restorative materials to reduce thermomechanical stress in endodontically treated teeth is complex.
Metallic posts share thermal properties with natural teeth, while composites offer superior mechanical strength, complicating stress evaluation.

Purpose of the Study:

To analyze the structural behavior of various post-endodontic restorations under thermomechanical loading.
To compare the relative effectiveness of different restoration concepts, including material type and post design.

Main Methods:

Three-dimensional finite element analysis (FEA) was used for an upper incisor restored with composite or metallic posts.
Customized versus standard post constructions were evaluated.
Loading scenarios included thermal stress from cold irritants and mastication of hot/cold foods, considering thermal inhomogeneity and occlusal forces.

Main Results:

Composite post systems demonstrated superior performance compared to metallic alloy posts when subjected to combined thermal cycling and mastication.
The relative efficacy of different restoration concepts was sensitive to the duration of thermal irritant exposure when mastication was absent.

Conclusions:

Composite posts are generally more efficient for endodontically restored teeth under combined functional and thermal challenges.
The choice between composite and metallic posts, and customized vs. standard designs, requires careful consideration of expected functional and thermal loads.