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Published on: March 7, 2014
Dentin shear strength: effect of distance from the pulp
N Konishi1, L G Watanabe, J F Hilton
1Department of Operative Dentistry, Okayama University Graduate School of Medicine and Dentistry, Field of Study of Biofunctional Recovery and Reconstruction, Okayama, Japan.
Summary
The ultimate shear strength (USS) of human molar dentin increases with distance from the pulp. Dentin near the enamel junction is stronger than dentin near the pulp, impacting restorative dentistry.
Area of Science:
- Biomaterials Science
- Dental Materials
- Tooth Structure
Background:
- Dentin structure and mechanical properties exhibit regional variations.
- Previous studies indicate that ultimate shear strength (USS) differs based on dentin location.
- Understanding these variations is crucial for dental applications.
Purpose of the Study:
- To investigate the relationship between USS and location in coronal dentin.
- To determine how USS varies with distance from the pulp in human molar teeth.
- To assess USS differences in central, buccal, and lingual dentin locations.
Main Methods:
- Specimens of coronal dentin were prepared from human molar teeth.
- Dentin samples were sourced from central locations and areas beneath cusps.
- Shear testing was performed on specimens at varying distances from the pulp.
Main Results:
- Median USS values ranged from 52.7 MPa near the pulp to 76.7 MPa near the dentino-enamel junction.
- USS was significantly lower in dentin closer to the pulp compared to more peripheral regions.
- No significant differences in USS were observed between buccal, central, or lingual locations.
Conclusions:
- Coronal dentin's mechanical properties, specifically USS, are influenced by the distance from the pulp.
- These variations in dentin strength may have implications for adhesive procedures and restorative dentistry outcomes.
- Dentin's anisotropic nature necessitates consideration of its location for predictable clinical performance.
