Indentation damage and crack repair in human enamel

Rivera, C.; Arola, D.; Ossa, E.A.

doi:10.1016/j.jmbbm.2013.02.020

Cited by 25 publications

(22 citation statements)

References 31 publications

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“…New treatments aimed at replacing the enamel proteins post-whitening may be necessary. A recent preliminary study reported that enamel undergoes a process of crack-healing involving crack closure [82]. The question that arises is whether this healing process is purely cosmetic, or if it also restores the integrity of the tissue as well.…”

Section: Discussionmentioning

confidence: 99%

The role of organic proteins on the crack growth resistance of human enamel

Yahyazadehfar

Arola

2015

Acta Biomaterialia

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With only 1% protein by weight, tooth enamel is the most highly mineralized tissue in mammals. The focus of this study was to evaluate contributions of the proteins on the fracture resistance of this unique structural material. Sections of enamel were obtained from the cusps of human molars and the crack growth resistance was quantified using a conventional fracture mechanics approach with complementary finite element analysis. In selected specimens the proteins were extracted using a potassium hydroxide treatment. Removal of the proteins resulted in approximately 40% decrease in the fracture toughness with respect to the fully proteinized control. The loss of organic content was most detrimental to the extrinsic toughening mechanisms, causing over 80% reduction in their contribution to the total energy to fracture. This degradation occurred by embrittlement of the unbroken bridging ligaments and consequent reduction in the crack closure stress. Although the organic content of tooth enamel is very small, it is essential to crack growth toughening by facilitating the formation of unbroken ligaments and in fortifying their potency. Replicating functions of the organic content will be critical to the successful development of bio-inspired materials that are designed for fracture resistance.

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Section: Discussionmentioning

confidence: 99%

The role of organic proteins on the crack growth resistance of human enamel

Yahyazadehfar

Arola

2015

Acta Biomaterialia

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“…As previously mentioned, the proteins play a critical role in the toughing mechanisms that contribute to the crack growth resistance of these materials. But the proteins also appear to act in repairing damage within mineralized tissues [12,165]. That topic has not been pursued in detail and has remained controversial.…”

Section: Challenges and Future Workmentioning

confidence: 99%

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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“…Boyde observed the deposition of new mineral within the crack and speculated that some cracks could “anneal” and “heal” in situ without the removal of the bulk damaged matrix. Biomineralization studies have clearly shown that the physicochemical dissolution and deposition of bone minerals constantly occur on the bone‐fluid interfaces as found in the mineralizing osteoid and in the process of refilling cracks in enamel . Besides minerals, other non‐collagen proteins may also be involved in the repair process.…”

Section: Discussionmentioning

confidence: 99%