Related Experiment Video
Updated: Aug 17, 2026

Ultrasonic Fatigue Testing in the Tension-Compression Mode
Published on: March 7, 2018
The effects of tubule orientation on fatigue crack growth in dentin
Dwayne D Arola1, Joseph A Rouland
1Department of Mechanical Engineering, University of Maryland, Baltimore, Maryland 21250, USA. darola@engr.umbc.edu
Abstract:
The fracture of restored teeth is a significant obstacle to lifelong oral health. Recent studies suggest that fatigue cracks originate at flaws introduced during cavity preparation and that fatigue crack growth is a principle cause of restored tooth fractures. In this study, the rate of fatigue crack growth in bovine dentin was estimated under mode I cyclic loading. Double cantilever beam (DCB) specimens were obtained from bovine molars and subjected to high cycle fatigue loading (10(5) < N < 10(6)). The fatigue crack growth rates were measured and used to estimate the crack growth exponent and coefficient according to the Paris Law. The average fatigue crack growth exponent was 4.7 +/- 0.6 for crack growth parallel to the dentin tubules, which was significantly larger than 4.3 +/- 0.5 for crack growth perpendicular to the tubules (t-test, CI > 80%). Although the crack growth rates varied considerably, there was no significant dependence on tubule orientation or tubule density. However, specific features of the fracture surfaces and tendencies for crack curving away from the tubules suggested preferential fatigue crack growth perpendicular to the dentin tubules. Results from this study are being used to guide an experimental investigation of fatigue crack growth in human dentin.
More Related Videos
07:37Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
Published on: January 16, 2019
07:42Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
Published on: December 20, 2024
Related Concept Videos
Fatigue
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
Tensile Strength Considerations of Concrete
The dimensions and shape of a concrete specimen also...
Behavior of Concrete Under Compressive Load
As the concrete specimen fractures under...
Microcracking in Concrete
Fatigue Strength of Concrete