Water loss at normal enamel histological points during air drying at room temperature

Water loss at normal enamel histological points during air drying at room temperature

Summary This in vitro study aimed to quantify water loss at histological points in ground sections of normal enamel during air drying at room temperature (25°C) and relative humidity of 50%. From each of 10 ground sections of erupted permanent human normal enamel, three histological points (n = 30)...

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Bibliographic Details
Published in:Journal of microscopy (Oxford) Vol. 250; no. 3; pp. 218 - 227
Main Authors: MEDEIROS, R.C.G., LIMA, T.A.S., GOUVEIA, C.R., SOUSA, F.B.
Format: Journal Article
Language:English
Published: England Wiley Subscription Services, Inc 01-06-2013
Subjects:
Air
Air drying
birefringence
dental enamel
Dental Enamel - chemistry
Desiccation
Diffusion rate
Drying
Enamel
Enamels
Grounds
histology
Humans
Humidity
microradiography
Molar - chemistry
Prisms
Relative humidity
Studies
Teeth
Temperature
water
Water - analysis
Water loss
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Summary:Summary This in vitro study aimed to quantify water loss at histological points in ground sections of normal enamel during air drying at room temperature (25°C) and relative humidity of 50%. From each of 10 ground sections of erupted permanent human normal enamel, three histological points (n = 30) located at 100, 300 and 500 μm from enamel surface and along a transversal following prisms paths were characterized regarding the mineral, organic and water volumes. Water loss during air drying was from 0 to 48 h. Drying occurred with both falling and constant‐drying rates, and drying stabilization times (Teq) ranged from 0.5 to 11 h with a mean 0.26 (±0.12)% weight loss. In some samples (n = 5; 15 points), Teq increased as a function of the distance from the enamel surface, and drying occurred at an apparent diffusion rate of 3.47 × 10−8 cm2 s−1. Our data provide evidence of air drying resulting in air replacing enamel's loosely bound water in prisms sheaths following a unidirectional water diffusion rate of 3.47 × 10−8 cm2 s−1 (from the original enamel surface inward), not necessarily resulting in water evaporating directly into air, with important implications for transport processes and optical and mechanical properties.
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ISSN:0022-2720
1365-2818
DOI:10.1111/jmi.12037