Topographic study of human tongue in relation to oral tribology

Wang, Xingqun; Upadhyay, Rituja; Chen, Jianshe

doi:10.1016/j.foodhyd.2019.04.022

Cited by 22 publications

(19 citation statements)

References 22 publications

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“…Average surface roughness parameters S a and S q were slightly higher in the case of the hydrophobic material (polyvinyl siloxane) in comparison to the hydrophilic material (alginate). Values of S a and S q reported here are larger but in the same order of magnitude of others reported elsewhere, 16 where impressions were collected in a different manner likely involving a larger pressure during the mask acquisition as compared to the current study.…”

Section: Resultssupporting

confidence: 78%

“… 7 − 10 , 15 Although advances have been made in recent years in adapting those tribological setups to the oral tribology context, true emulation of the complex anatomical features of a real tongue surface and its physical performance remains incomplete. 16 − 19 For instance, silicone surfaces commonly employed in combination with low working loads, typically below 5.0 N, 20 , 21 result in contact pressures above 200.0 kPa, 20 which are about 1 order of magnitude higher than the maximum pressure of the human tongue-palate interface (∼50 kPa). 22 , 23 Smooth elastomeric surfaces are generally used as the current state-of-the-art for in vitro oral tribology testing.…”

Section: Introductionmentioning

confidence: 99%

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3D Biomimetic Tongue-Emulating Surfaces for Tribological Applications

Andablo‐Reyes

Bryant

Neville

et al. 2020

ACS Appl. Mater. Interfaces

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Oral friction on the tongue surface plays a pivotal role in mechanics of food transport, speech, sensing, and hedonic responses. The highly specialized biophysical features of the human tongue such as micropapillae-dense topology, optimum wettability, and deformability present architectural challenges in designing artificial tongue surfaces, and the absence of such a biomimetic surface impedes the fundamental understanding of tongue–food/fluid interaction. Herein, we fabricate for the first time, a 3D soft biomimetic surface that replicates the topography and wettability of a real human tongue. The 3D-printed fabrication contains a Poisson point process-based (random) papillae distribution and is employed to micromold soft silicone surfaces with wettability modifications. We demonstrate the unprecedented capability of these surfaces to replicate the theoretically defined and simulated collision probability of papillae and to closely resemble the tribological performances of human tongue masks. These de novo biomimetic surfaces pave the way for accurate quantification of mechanical interactions in the soft oral mucosa.

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Section: Resultssupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

3D Biomimetic Tongue-Emulating Surfaces for Tribological Applications

Andablo‐Reyes

Bryant

Neville

et al. 2020

ACS Appl. Mater. Interfaces

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“…Although the surface roughness of human tongue reported; approx. 90 μm (Wang, Upadhyay, & Chen, 2019) is larger than that of the geometry used, usage of this geometry has been validated previously in terms of the suitability to texture evaluation (Kim et al, 2015; Pondicherry et al, 2018). For measurements, 1 ml of each test solution was placed into the container, followed by application of the normal force at 0.3 N between the upper surface and the test solution.…”

Section: Methodsmentioning

confidence: 91%

Instrumental characteristics from extensional rheology and tribology of polysaccharide solutions

Funami

Nakauma

2021

Journal of Texture Studies

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Instrumental characteristics from extensional rheology and tribology for aqueous xanthan gum (XG) and locust bean gum (LBG) solutions were studied in the presence or absence of simulated saliva. Extensional viscosity was calculated from the filament shrinkage behavior using a capillary breakup extensional rheometer, whereas the friction coefficient was measured using a set‐up consisting of polydimethylsiloxane substrate and a glass ball bearing on a rotational rheometer. Increase in extensional viscosity was detected immediately after initiation of extensional flow, particularly XG, and also immediately before the filament rupture, particularly LBG. Extensional viscosity tended to decrease with increased addition of simulated saliva for XG, while to increase for LBG. In both cases, effect of cations in the saliva was greater than that of mucin. From the shape of the Stribeck curve (i.e., dependence of the friction coefficient on the entrainment speed) and comparison of the friction coefficient itself, lubricity of XG was greater than that of LBG. Simulated saliva added decreased the friction coefficient for each polysaccharide through functions of cations rather than mucin. Extensional viscosity and tribological measurements revealed mechanical properties of polysaccharide solutions which cannot be determined or quantified by shear viscosity alone.

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“…A total of 15 participants (seven males and eight females, aged 21.7 ± 2.1 years) with different tongue surface roughness measurements were selected for this study (ranging from 54.6–140.0 μm). All had participated in the previous tongue topography measurement study and were familiar with the experimental procedures 22 . They had no reported oral health problems; they had not been on medication for at least 2 weeks at the time of experiment, and they were non‐smokers with no alcohol abuse history.…”

Section: Methodsmentioning

confidence: 99%

“…All had participated in the previous tongue topography measurement study and were familiar with the experimental procedures. 22 They had no reported oral health problems; they had not been on medication for at least 2 weeks at the time of experiment, and they were non-smokers with no alcohol abuse history. All participants were asked not to have food or beverages for at least 1 h before the experiment, although pure water was allowed.…”

Section: Participants Recruitmentmentioning

confidence: 99%

In situ oral lubrication and smoothness sensory perception influenced by tongue surface roughness

Wang

Chen

2021

J Sci Food Agric

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BACKGROUND The human tongue is important in the oral processing of food and in sensory perception. Tongue topography could influence delicate differences in sensory perception. It is hypothesized that tongue surface roughness could alter oral lubrication status and affect perception of smoothness. Fifteen participants with varying levels of tongue surface roughness were recruited and tested. Participants' in situ oral lubrication status without and after consumption of fluid food (milk with varying fat content and maltodextrin solutions with different shear viscosities) was measured. Participants' smoothness sensory scores were also recorded. RESULTS The in situ friction coefficient (0.299–1.505) was significantly positively correlated with tongue‐surface roughness (54.6–140.0 μm) in all types of test fluid samples across participants. Oral lubrication was significantly decreased when participants consumed the test fluid samples compared with no liquid food consumption, for all test fluid sample types (P < 0.05). No significant differences in in situ friction coefficient were found after participants consumed different test fluid samples, and this was mainly attributed to the limited quantities of fluid residuals in the oral cavity after expectoration. Participants whose tongue surface roughness differed did not exhibit significant differences in smoothness perception with different test fluid samples. CONCLUSION Tongue surface roughness has a strong impact on in situ oral lubrication, and fluid food intake reduces in situ oral lubrication significantly. Saliva film and tongue surface roughness might play greater roles in oral lubrication and smoothness sensory perception if fluid is expectorated after consumption. The association between oral physiology and texture perception still needs further elucidation. © 2021 Society of Chemical Industry.

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Topographic study of human tongue in relation to oral tribology

Cited by 22 publications

References 22 publications

3D Biomimetic Tongue-Emulating Surfaces for Tribological Applications

3D Biomimetic Tongue-Emulating Surfaces for Tribological Applications

Instrumental characteristics from extensional rheology and tribology of polysaccharide solutions

In situ oral lubrication and smoothness sensory perception influenced by tongue surface roughness

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