Effect of saliva viscosity on tribological behaviour of tooth enamel

Sajewicz, Eugeniusz

doi:10.1016/j.triboint.2008.07.001

Cited by 35 publications

(21 citation statements)

References 27 publications

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“…Variation among specimens should be attributed to the differences in the physical properties of the material not the variation in a component of the wear testing system, such as the food simulating medium. It is important, however, to include a food simulating medium in wear testing as previous studies have shown both increased and decreased wear in the presence of a third-body medium [18,19]. …”

Section: Discussionmentioning

confidence: 99%

Characterization of third-body media particles and their effect on in vitro composite wear

et al. 2012

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Objectives The purpose of this study was to compare four medium particles currently used for in vitro composite wear testing (glass and PMMA beads and millet and poppy seeds). Methods Particles were prepared as described in previous wear studies. Hardness of medium particles was measured with a nano-indentor, particle size was measured with a particle size analyzer, and the particle form was determined with light microscopy and image analysis software. Composite wear was measured using each type of medium and water in the Alabama wear testing device. Four dental composites were compared: a hybrid (Z100), flowable microhybrid (Estelite Flow Quick), micromatrix (Esthet-X), and nano-filled (Filtek Supreme Plus). The test ran for 100,000 cycles at 1.2Hz with 70N force by a steel antagonist. Volumetric wear was measured by non-contact profilometry. A two-way analysis of variance (ANOVA) and Tukey's test was used to compare both materials and media. Results Hardness values (GPa) of the particles are (glass, millet, PMMA, poppy respectively): 1.310(0.150), 0.279(.170), 0.279(0.095), and 0.226(0.146). Average particle sizes (μm) are (glass, millet, PMMA, poppy respectively): 88.35(8.24), 8.07(4.05), 28.95(8.74), and 14.08(7.20). Glass and PMMA beads were considerably more round than the seeds. During composite wear testing, glass was the only medium that produced more wear than the use of water alone. The rank ordering of the materials varied with each medium, however, the glass and PMMA bead medium allowed better discrimination between materials. Significance PMMA beads are a practical and relevant choice for composite wear testing because they demonstrate similar physical properties as seeds but reduce the variability of wear measurements.

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Section: Discussionmentioning

confidence: 99%

Characterization of third-body media particles and their effect on in vitro composite wear

et al. 2012

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“…Saliva has the characteristics of a weak gel (Glantz, 1997) and has a strong time-dependent viscoelastic behaviour, which in turn depends, among other parameters, on the type of stimulation (Stokes and Davies, 2007). The lubrication characteristics of saliva and its molecular structure have been an area of active research (Bongaerts et al, 2007b;Sajewicz, 2009). Although some of the unique properties of saliva are attributed to the high molecular weight of mucin (Strous and Dekker, 1992), it has been also shown that the performance of a simple mucin solution is different to that of saliva itself (Raynal et al, 2002).…”

Section: Interactions With Salivamentioning

confidence: 99%

Protein‐Stabilised Emulsions and Rheological Aspects of Structure and Mouthfeel

Spyropoulos

Heuer

Mills

et al. 2010

Practical Food Rheology

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“…Like these materials, the dental enamel also shows a wear reduction when lubricated by saliva [11]. Wear mode changes caused by different environments could be explained by mechanical properties variations in the enamel surface and/or by chemical reactions induction [12,13]. However a little is known about the synergistic effect between saliva and loading on the induction of brittle mechanisms or tribochemical reactions when two incisal surfaces slide over each other.…”

Section: Introductionmentioning

confidence: 99%

Tribological Behaviour of Dental Enamel Under Reciprocating Sliding

Coppo¹,

Martins²,

Silva³

et al. 2014

ABM Proceedings

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The prevention of dental enamel wear has particular relevance for preventive and restorative purposes in dentistry. The wear damage can increase due to salivary disorders and/or parafunction (bruxism); antagonists incisal surfaces become flat and coincident. This study aims to investigate the wear behavior and the related mechanisms in sliding pairs of conformal incisal enamel, with similar values of hardness and fracture toughness, with different applied normal loads and lubricated conditions. Bovine incisors, under pin on flat configuration, were tested in two lubrication condition (dry or with natural saliva) and two applied normal loads (8 and 16 N). The worn surfaces were investigated by 3D profilometry and SEM. The analysis of worn surfaces indicated mechanisms of brittle fracture, but with different severities. Under a normal load of 16 N and dry condition, wear is controlled by a brittle process: microcracking with flake-like wear particles, which results in high friction coefficient (> 0.85), wear rate and wear volume. On the other hand, under a normal load of 8 N and natural saliva, wear took place in the interprismatic region, with consequent exposure of prisms and fracture in localized regions. In this case, the friction coefficient was 16% lower and the wear volume was one order of magnitude lower. Under 8 N and natural saliva, the wear was greater than in the dry condition, probably due to tribochemical reactions.

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Effect of saliva viscosity on tribological behaviour of tooth enamel

Cited by 35 publications

References 27 publications

Characterization of third-body media particles and their effect on in vitro composite wear

Characterization of third-body media particles and their effect on in vitro composite wear

Protein‐Stabilised Emulsions and Rheological Aspects of Structure and Mouthfeel

Tribological Behaviour of Dental Enamel Under Reciprocating Sliding

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