Morphology and fracture of enamel

Myoung, Sang-Won; Lee, James; Constantino, Paul J.; Lucas, Peter W.; Chai, Herzl; Lawn, Brian R.

doi:10.1016/j.jbiomech.2009.05.013

Cited by 46 publications

(35 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Furthermore, the puncture performance of different morphologies on multilayered biological composite materials is virtually unknown. Work has been done examining fracture patterns on toothlike brittle dome structures [54][55][56][57], but little is known about how multi-layered structures would alter puncture or cutting patterns [11,14]. The nature of multi-layered bio-composites leads to further questions about the scale of tool morphology and prey material.…”

Section: Morphologymentioning

confidence: 99%

Point of impact: the effect of size and speed on puncture mechanics

Anderson

LaCosse²,

Pankow

2016

Interface Focus.

View full text Add to dashboard Cite

The use of high-speed puncture mechanics for prey capture has been documented across a wide range of organisms, including vertebrates, arthropods, molluscs and cnidarians. These examples span four phyla and seven orders of magnitude difference in size. The commonality of these puncture systems offers an opportunity to explore how organisms at different scales and with different materials, morphologies and kinematics perform the same basic function. However, there is currently no framework for combining kinematic performance with cutting mechanics in biological puncture systems. Our aim here is to establish this framework by examining the effects of size and velocity in a series of controlled ballistic puncture experiments. Arrows of identical shape but varying in mass and speed were shot into cubes of ballistic gelatine. Results from high-speed videography show that projectile velocity can alter how the target gel responds to cutting. Mixed models comparing kinematic variables and puncture patterns indicate that the kinetic energy of a projectile is a better predictor of penetration than either momentum or velocity. These results form a foundation for studying the effects of impact on biological puncture, opening the door for future work to explore the influence of morphology and material organization on high-speed cutting dynamics.

show abstract

Section: Morphologymentioning

confidence: 99%

Point of impact: the effect of size and speed on puncture mechanics

Anderson

LaCosse²,

Pankow

2016

Interface Focus.

View full text Add to dashboard Cite

show abstract

“…Margin cracks initiate from intrinsic defects (i.e., the protein-rich tufts) at the DEJ and propagate to the occlusal surface of the teeth. Further loading causes other modes of failure such as chipping, cone cracking outside the contact zone, as well as delamination failure at the DEJ or progression into dentin [12,33].…”

Section: On the Fracture Resistance Of Teethmentioning

confidence: 99%

“…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%

See 1 more Smart Citation

On the Mechanics of Fatigue and Fracture in Teeth

Yahyazadehfar

Ivancik

Majd

et al. 2014

Applied Mechanics Reviews

View full text Add to dashboard Cite

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.

show abstract

“…Mechanisms by which this toughening is achieved are still being worked out, but the protein content is crucial [12]. Although enamel is classically thought to be incapable of repair, recent studies suggest that this is possible via movement of the protein gel into cracks so as to heal them [14,15]. Figure 1a shows categories of fracture that may damage a bunodont molar tooth crown.…”

Section: Introductionmentioning

confidence: 99%

Dental abrasion as a cutting process

Lucas

Wagner²,

Al‐Fadhalah

et al. 2016

Interface Focus.

View full text Add to dashboard Cite

A mammalian tooth is abraded when a sliding contact between a particle and the tooth surface leads to an immediate loss of tooth tissue. Over time, these contacts can lead to wear serious enough to impair the oral processing of food. Both anatomical and physiological mechanisms have evolved in mammals to try to prevent wear, indicating its evolutionary importance, but it is still an established survival threat. Here we consider that many wear marks result from a cutting action whereby the contacting tip(s) of such wear particles acts akin to a tool tip. Recent theoretical developments show that it is possible to estimate the toughness of abraded materials via cutting tests. Here, we report experiments intended to establish the wear resistance of enamel in terms of its toughness and how friction varies. Imaging via atomic force microscopy (AFM) was used to assess the damage involved. Damage ranged from pure plastic deformation to fracture with and without lateral microcracks. Grooves cut with a Berkovich diamond were the most consistent, suggesting that the toughness of enamel in cutting is 244 J m 22, which is very high. Friction was higher in the presence of a polyphenolic compound, indicating that this could increase wear potential.

show abstract

Morphology and fracture of enamel

Cited by 46 publications

References 24 publications

Point of impact: the effect of size and speed on puncture mechanics

Point of impact: the effect of size and speed on puncture mechanics

On the Mechanics of Fatigue and Fracture in Teeth

Dental abrasion as a cutting process

Contact Info

Product

Resources

About