Degradation in the Fatigue Resistance of Dentin by Bur and Abrasive Air-jet Preparations

Majd, H. Mohammadi; Viray, J.; Porter, Judith; Romberg, Elaine; Arola, D.

doi:10.1177/0022034512455800

Cited by 16 publications

(33 citation statements)

References 25 publications

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“…Tooth fracture is more likely to originate from cracks that initiate and grow within the dentin. Flaws in the form of cracks can be introduced within the dentin during the restorative process as a result of material removal [25,26]. As an alternative, cracks may develop in dentin from incipient flaws as a result of fatigue, particularly in regions of stress concentration posed by the restoration geometry [21].…”

Section: Fracture Properties Of Dentinmentioning

confidence: 99%

“…More recent work has shown that the processes used for cutting of dentin during the introduction of restorations can cause a substantial reduction in fatigue strength. Specifically, Majd et al [26] discovered that cutting of coronal dentin with either carbide cutting burs or an abrasive air jet (both clinically relevant) substantially degraded the stress-life fatigue resistance. Cutting with carbide burs reduced the apparent endurance limit by nearly 40% (Fig.…”

Section: Fatigue Properties Of Dentinmentioning

confidence: 99%

“…Specifically, there is a significant decrease in the stress intensity threshold, and increase in the incremental rate of cyclic crack extension with an increase in proximity to the pulp cavity [141]. Thus, due to the potential for introducing defects during the cutting of dentin [26], the probability of tooth fracture after the placement of a dental restoration increases with depth of the preparation from the occlusal surface. A survey of the mechanisms identified in resisting fatigue crack growth shows that they are consistent with those active in quasistatic crack extension, and that extrinsic toughening via crack bridging is believed to be the most potent.…”

Section: Fatigue Properties Of Dentinmentioning

confidence: 99%

“…The importance of cavity size and design [21,22], the amount of damage introduced to the tissue by excavations e.g., Refs. [23][24][25][26] and the type of restoration e.g., Refs. [27,28] are some of factors which have been studied over the past decades.…”

Section: Introductionmentioning

confidence: 99%

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On the Mechanics of Fatigue and Fracture in Teeth

Yahyazadehfar

Ivancik

Majd

et al. 2014

Applied Mechanics Reviews

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Tooth fracture is a major concern in the field of restorative dentistry. However, knowledge of the causes for tooth fracture has developed from contributions that are largely based within the field of mechanics. The present manuscript presents a technical review of advances in understanding the fracture of teeth and the fatigue and fracture behavior of their hard tissues (i.e., dentin and enamel). The importance of evaluating the fracture resistance of these materials, and the role of applied mechanics in developing this knowledge will be reviewed. In addition, the complex microstructures of tooth tissues, their roles in resisting tooth fracture, and the importance of hydration and aging on the fracture resistance of tooth tissues will be discussed. Studies in this area are essential for increasing the success of current treatments in dentistry, as well as in facilitating the development of novel bio-inspired restorative materials for the future.

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Section: Fracture Properties Of Dentinmentioning

confidence: 99%

Section: Fatigue Properties Of Dentinmentioning

confidence: 99%

Section: Fatigue Properties Of Dentinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On the Mechanics of Fatigue and Fracture in Teeth

Yahyazadehfar

Ivancik

Majd

et al. 2014

Applied Mechanics Reviews

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“…However, Sehy and Drummond [15] could not identify visible or microscopic cracking in dentin after performing bur treatments. Majd et al [16] evaluated the influence of bur cutting and an abrasive air jet treatment on the fatigue strength of coronal dentin. Despite an increase in surface roughness with respect to control surfaces and development of a smear layer, flaws or cracks were not evident in the prepared surfaces and there was no change to the static strength.…”

Section: Damage and Flawsmentioning

confidence: 99%

The Tooth

Arola

Gao

Hai

et al. 2017

Dental Clinics of North America

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Synopsis This article provides a brief review of recent investigations concerning the structure and properties of the tooth. The last decade has brought a greater emphasis on the “durability” of the tooth, an improved understanding of the fatigue and fracture behavior of the principal tissues and their importance to tooth failures. The primary contributions to tooth durability are discussed, including the process of placing a restoration, the impact of aging, and challenges posed by the oral environment. The significance of these findings to the dental community, and their importance to the pursuit of lifelong oral health are highlighted.

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Degradation in the fatigue strength of dentin by diamond bur preparations: Importance of cutting direction

Majd

Porter

et al. 2015

J Biomed Mater Res

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The objectives of this investigation were to evaluate the degradation in fatigue strength of dentin by diamond bur preparations and to identify the importance of cutting direction. Three groups of coronal dentin specimens were prepared from unrestored 3rd molars, including a flaw free “control”, and two groups that received a diamond bur cutting treatment performed parallel or perpendicular to the specimen length. The specimens were subjected to static or cyclic flexural loading to failure and the results were compared with data for carbide bur cutting. Under static loading diamond bur cutting resulted in significantly flexure lower strength (p≤0.05) than the control for both cutting directions (from 154 MPa to approx. 124 MPa). However, there was no significant difference in the strength between the control and carbide bur treated specimens. Similarly, the fatigue strength of the diamond bur treated specimens was significantly lower (p≤0.0001) than that of the control for both cutting directions. Cutting in the perpendicular direction resulted in nearly 60% reduction to the endurance limit (from 44 MPa to 19 MPa). Based on the results, diamond bur cutting of cavity preparations causes a reduction in the fatigue strength of dentin, regardless of the cutting direction. To maintain the durability of dentin, cavity preparations introduced using diamond burs must be performed with appropriate cutting direction and followed by a finishing pass.

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Degradation in the Fatigue Resistance of Dentin by Bur and Abrasive Air-jet Preparations

Abstract: A supplemental appendix to this article is published electronically only at http://jdr.sagepub.com/supplemental.

Cited by 16 publications

References 25 publications

On the Mechanics of Fatigue and Fracture in Teeth

On the Mechanics of Fatigue and Fracture in Teeth

The Tooth

Degradation in the fatigue strength of dentin by diamond bur preparations: Importance of cutting direction

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