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Optical coherence tomography evaluation of deep dentin crack removal techniques.
Daniel Hovander1, Grant Chyz1,2, Yasushi Shimada3
1Biomimetics Biomaterials Biophotonics Biomechanics & Technology (B4T) Laboratory, Department of Restorative Dentistry, University of Washington, Seattle, WA.
JADA Foundational Science
|June 4, 2026
Summary
Airborne particle abrasion effectively removed deep dentin cracks with minimal propagation. Dental burs created new cracks, highlighting particle abrasion as a superior method for crack treatment.
Area of Science:
- Endodontics
- Dental Materials Science
- Biomaterials
Background:
- Deep coronal dentin cracks pose a clinical challenge.
- Evaluating current techniques for crack removal is crucial.
Purpose of the Study:
- To noninvasively evaluate the effectiveness of clinical techniques for removing deep coronal dentin cracks.
- To compare crack propagation and dentin removal using airborne-particle abrasion versus various dental burs.
Main Methods:
- An in vitro study using 40 human posterior teeth with induced dentin cracks.
- Optical coherence tomography (OCT) for noninvasive crack evaluation.
- Comparison of airborne-particle abrasion and five types of dental burs for crack removal.
Main Results:
- Airborne particle abrasion resulted in significantly less crack propagation compared to all bur groups.
- Dental burs induced new cracks and extended existing ones.
- The volume of removed dentin varied among burs, with particle abrasion removing the largest volume.
Conclusions:
- Dental burs used for crack removal can induce new cracks and propagate existing ones.
- Airborne particle abrasion demonstrated superior performance by inducing fewer new cracks.
- The choice of bur significantly impacts dentin removal volume and crack propagation.
