Contact fatigue of human enamel: Experiments, mechanisms and modeling

Gao, Shanshan; An, Bingbing; Yahyazadehfar, Mobin; Zhang, D.; Arola, D.

doi:10.1016/j.jmbbm.2016.02.030

Cited by 38 publications

(24 citation statements)

References 64 publications

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“…The remaining prisms will be increasingly subjected to lateral forces. Such forces have a more disruptive effect than axial forces, presumably because the enamel prisms of the cusp are resistant to the growth of subsurface cracks along the axis of the enamel [Gao et al, 2016]. Enamel is the most highly mineralized tissue in the human body and has enamel prisms arranged in columnar fashion surrounded by a sheath of non-collagenous matrix -the prism sheath.…”

Section: Discussionmentioning

confidence: 99%

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

Ruben¹,

Roeters

Truin³

et al. 2019

Caries Res

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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.

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Section: Discussionmentioning

confidence: 99%

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

Ruben¹,

Roeters

Truin³

et al. 2019

Caries Res

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“…17,18 Nano-indentation tests have been reported as effective methods for the measurement of the mechanical characteristics of materials, such as nanocomposites, tooth enamel and bone cement. [19][20][21][22][23] In nano-indentation testing, the depth of the penetration beneath the analyzed sample surface is measured as the load is applied to the indenter. The shape of the load-displacement curves, which are presented in this paper, are a very useful source of information, not only for calculating the modulus and hardness of the analysed specimens, but also for the discovery of non-linear effects, if any (such as cracking or phase transformations).…”

Section: Introductionmentioning

confidence: 99%

Characterization of glass ionomer cements stored in various solutions

Petrović¹,

Marković²,

Kojić³

et al. 2019

Mater. Tehnol.

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The aim of this work was to evaluate the nano-mechanical properties of glass ionomer materials, the ion concentrations at the surfaces in relation to the storage media and the pH environments using a scanning electron microscope with an energy-dispersive spectrometer (SEM/EDX). The glass-ionomer-based materials, Fuji Triage (FT), Fuji VIII (FVIII), Fuji IX GP (FIX), were analyzed. The sample comprised 45 cured cement disks. Five specimens of each tested material were placed in 3 storage solutions (saline, acidic solution with pH of 5.5, NaF solution with 0.05 % of fluoride). Nano-indentations were performed with a force up to 30 mN, penetration depths of 2500-2700 nm for 1 d and 21 d after setting. The EDX evaluation was carried out for each experimental disk, identifying the ions: O, Al, Sr, Si, F, Na, P, Ca. The level of significance was placed at p < 0.05.The highest fluoride proportion at the specimen surface was recorded in the FT material. FT also exhibited the lowest fluoride ions content when stored in low-pH environments compared with the other tested materials (p < 0.05). The surface hardness of the tested materials decreased from 1.377 GPa (in saline) to 0.03 GPa (in acid). The Young's modulus varied from 14.35 GPa to 0.112 GPa, depending on the material type (Fuji VIII>Fuji IX>FT) (p < 0.001) and the storage media (p < 0.001). Both the mechanical and cariostatic surface properties of commercially available glass ionomer materials are affected by the storage media.Namen predstavljenega dela je bil ovrednotiti nanomehanske lastnosti ionomerskih steklenih materialov, ki slu`ijo v zobni protetiki kot razna polnila. Koncentracijo ionov na povr{ini v povezavi z medijem za shranjevanje s specifi~nim pH okoljem so okarakterizirali tudi z uporabo vrsti~nega elektronskega mikroskopa s prigrajenim energijskim disperzijskim spektroskopom (SEM/EDX). Analizirali so naslednje materiale na osnovi steklenih ionomerov: Fuji Triage (FT), Fuji VIII (FVIII) in Fuji IX GP (FIX). Vzorci so vsebovali 45 vulkaniziranih cementnih diskov. Po pet (5) vzorcev vsakega preiskovanega materiala so vstavili v tri (3) razli~ne raztopine za shranjevanje (slano vodo, kislo raztopino s pH 5,5 in raztopino NaF s 500 ppm fluorida). Po postavitvi vzorcev so izvedli nanoindentacije (vtiskovanje nanopiramide) na vzorcih s silo do 30 mN in nastala je globina vtiska od 2500 do 2700 nm. Tako pripravljeni vzorci so se nato nahajali v raztopinah od enega (1) do enaindvajset (21) dni. Z EDX so dolo~ili ione: O, Al, Sr, Si, F, Na, P in Ca na vseh eksperimentalnih diskih. Nivo pomembnosti so postavili na p<0,05. Najve~ji dele`fluorida so zaznali na vzorcu iz FT. Ta vzorec je prav tako pokazal najni`jo vsebnost fluoridnih ionov, ko je bil shranjen v okolju z nizkim pH v primerjavi z drugimi preiskovanimi materiali (p<0,05). Trdota vzorcev na povr{ini je padala od slanice z 1,377 GPa na 0,03 GPa v kislem mediju. Youngov modul je variiral od 14,35 GPa do 0,112 GPa, odvisno od vrste materiala (Fuji VIII>Fuji IX>FT) (p<0,001) in medija za shranjevanje (p<0...

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“…Gao et al [20] recently evaluated the damage resulting from contact fatigue of enamel with ceramic restorations. Results from cyclic loading experiments are presented in terms of a contact load-life diagram in Fig.…”

Section: Damage and Flawsmentioning

confidence: 99%

“…Results of contact fatigue suggest that the enamel is not resistant to cyclic loading [20]. An estimate of the fatigue limit of outer (near-occlusal) enamel was recently reported in an assessment of adhesive bond durability [61].…”

Section: Properties Of Importancementioning

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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Contact fatigue of human enamel: Experiments, mechanisms and modeling

Cited by 38 publications

References 64 publications

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

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

Characterization of glass ionomer cements stored in various solutions

The Tooth

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