The Wear and Tear of Teeth

Lucas, Peter W.; Casteren, Adam van

doi:10.1159/000367976

Cited by 38 publications

(34 citation statements)

References 88 publications

(115 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The crack growth resistance is a function of distance from the tooth's surface, where straight prisms are present in the outer enamel and oblique crossing of bundles of prisms (decussating) in the inner enamel [Bajaj and Arola, 2009]. According to Lucas and van Casteren [2015], cracks (fractures) can be initiated when sufficient strain energy is available. A large and hard particle under the contact area can produce a fracture in the underlying enamel just above the enamel dentine junction, although a smaller and softer particle can also cause fractures due to bending deformation further from the contact area.…”

Section: Discussionmentioning

confidence: 99%

Cup-Shaped Tooth Wear Defects: More than Erosive Challenges?

Ruben¹,

Roeters

Truin³

et al. 2019

Caries Res

View full text Add to dashboard Cite

Background/Aim: The underlying mechanism of the development of cups and grooves on occlusal tooth surfaces is still unclear. The aim of this study was to evaluate factors contributing to in vitro cup formation, in order to elucidate the clinical process. Methods: A total of 48 extracted human molar teeth were exposed to acidic aqueous solutions at pH of 4.8 and 5.5 in constant motion, in combination with different loading conditions: no load (0N group, control), 30 N (30N group) or 50 N (50N group) (n = 8 per group). Before and after 3 months of exposure (1,422,000 loading cycles), the samples were scanned using a non-contact profilometer. Pre- and post-exposure scans were subtracted and height loss and volume tissue loss were calculated. Representative samples with wear and cupping lesions were imaged using scanning electron microscopy, light microscopy and micro-computed tomography. Results: Average height and volume tissue loss at pH 5.5 was 54 µm and 3.4 mm³ (0N), 52 µm and 3.4 mm³ (30N) and 58 µm and 3.7 mm³ (50N), respectively, with no statistically significant differences. Average height and volume loss at pH 4.8 were 135 µm and 8.7 mm³ (0N), 172 µm and 12.6 mm³ (30N) and 266 µm and 17.8 mm³ (50N), respectively, with a statistically significant difference between 0N and 50N (p < 0.002). Cup-shaped lesions had formed only at pH of 4.8, in the 30N and 50N groups. Conclusion: The study showed that a cup can arise fully in enamel and that mechanical loading in addition to erosive challenges are required.

show abstract

Section: Discussionmentioning

confidence: 99%

Cup-Shaped Tooth Wear Defects: More than Erosive Challenges?

Ruben¹,

Roeters

Truin³

et al. 2019

Caries Res

View full text Add to dashboard Cite

show abstract

“…At larger scales, toughness only increases dramatically in decussating enamel (Yahyazadehfar et al 2013) with the clearest mechanism being the bridges of mineral that cross a developing crack, so obstructing its progress (Bajaj and Arola 2009;Yahyazadehfar et al 2013). A short discussion of how these bridges act can be found in Lucas and van Casteren (2015).…”

Section: Hierarchical Modeling and Enamel Mechanicsmentioning

confidence: 99%

Structure and scale of the mechanics of mammalian dental enamel viewed from an evolutionary perspective

Lucas

Philip

Al-Qeoud

et al. 2015

Evolution and Development

Self Cite

View full text Add to dashboard Cite

Mammalian enamel, the contact dental tissue, is something of an enigma. It is almost entirely made of hydroxyapatite, yet exhibits very different mechanical behavior to a homogeneous block of the same mineral. Recent approaches suggest that its hierarchical composite form, similar to other biological hard tissues, leads to a mechanical performance that depends very much on the scale of measurement. The stiffness of the material is predicted to be highest at the nanoscale, being sacrificed to produce a high toughness at the largest scale, that is, at the level of the tooth crown itself. Yet because virtually all this research has been conducted only on human (or sometimes "bovine") enamel, there has been little regard for structural variation of the tissue considered as evolutionary adaptation to diet. What is mammalian enamel optimized for? We suggest that there are competing selective pressures. We suggest that the structural characteristics that optimize enamel to resist large-scale fractures, such as crown failures, are very different to those that resist wear (small-scale fracture). While enamel is always designed for damage tolerance, this may be suboptimal in the enamel of some species, including modern humans (which have been the target of most investigations), in order to counteract wear. The experimental part of this study introduces novel techniques that help to assess resistance at the nanoscale.

show abstract

“…These BGs were introduced in the late 1960s primarily for osteogenesis; however, since then, their inclusion in various dental products, especially dentifrices, has been increasing [8]. As the bone and dentin are similar in structure, the use of BGs on dentin could prove useful in attaining clinical benefits [9].…”

Section: Introductionmentioning

confidence: 99%

Dentin Tubule Occlusion Potential of Novel Dentifrices Having Fluoride Containing Bioactive Glass and Zinc Oxide Nanoparticles

et al. 2019

View full text Add to dashboard Cite

Objective: To compare the in vitro potential of dentin tubule occlusion of two novel experimental dentifrices consisting of fluoride containing bioactive glass (BG) with zinc oxide nanoparticles. Materials and Methods: Forty-eight dentin discs (n = 48) were divided into 6 groups (n = 8), based on their brushing dentifrices: Group 1 = artificial saliva (AS; control); Group 2 = fluoride dentifrice (Colgate Palmolive^©, UK); Group 3 = experimental nonactive agent dentifrice; Group 4 = experimental dentifrice with 1.5% BG; Group 5 = experimental dentifrice with 4% BG; and Group 6 = BioMinF^© dentifrice. Postbrushing, the discs were subjected to acidic challenge with 6% wt citric acid (pH = 4.0) for 1 min. Scanning electron microscope (SEM) and energy-dispersive X-ray (EDX) spectroscopy were performed pre- and post-citric acid challenges, and percentages of tubule occlusion assessed. Results: SEM micrographs of group 1 (AS) show no tubule occlusion (0%), whereas those of groups 2 and 3 show partial tubule occlusion (25 to <50% of tubules occluded). The SEM micrographs of dentifrices containing fluoride-BG (groups 4, 5, and 6) show that most of the tubules (>50 and <100%) were occluded. For all the groups (excluding group 1), pre- and post-citric acid challenge values are statistically significant (p < 0.05). EDX analysis reveals the presence of zinc in experimental dentifrices only. Conclusion: The results of novel experimental dentifrices are comparable to those of the BioMinF^©, in terms of tubule occlusion. Dentifrices containing BG could serve as an alternative in dentin sensitivity management.

show abstract

The Wear and Tear of Teeth

Cited by 38 publications

References 88 publications

Cup-Shaped Tooth Wear Defects: More than Erosive Challenges?

Cup-Shaped Tooth Wear Defects: More than Erosive Challenges?

Structure and scale of the mechanics of mammalian dental enamel viewed from an evolutionary perspective

Dentin Tubule Occlusion Potential of Novel Dentifrices Having Fluoride Containing Bioactive Glass and Zinc Oxide Nanoparticles

Contact Info

Product

Resources

About