Login to MyKarger

New to MyKarger? Click here to sign up.

Login with Facebook

Forgot Password? Reset your password

Authors, Editors, Reviewers

For Manuscript Submission, Check or Review Login please go to Submission Websites List.

Submission Websites List

Institutional Login (Shibboleth)

For the academic login, please select your country in the dropdown list. You will be redirected to verify your credentials.

Table of Contents
Vol. 27, No. 2, 1993
Issue release date: 1993
Section title: Basic Science
Caries Res 1993;27:81–86
(DOI:10.1159/000261522)

The Water in Human Dental Enamel and Its Diffusional Exchange Measured by Clearance of Tritiated Water from Enamel Slabs of Varying Thickness

Dibdin G.H.
MRC Dental Group, University of Bristol Dental School, Bristol, UK

Do you have an account?

Login Information





Contact Information










I have read the Karger Terms and Conditions and agree.



Login Information





Contact Information










I have read the Karger Terms and Conditions and agree.



To view the fulltext, please log in

To view the pdf, please log in

Buy

  • FullText & PDF
  • Unlimited re-access via MyKarger
  • Unrestricted printing, no saving restrictions for personal use
read more

CHF 38.00 *
EUR 35.00 *
USD 39.00 *

Select

KAB

Buy a Karger Article Bundle (KAB) and profit from a discount!

If you would like to redeem your KAB credit, please log in.


Save over 20% compared to the individual article price.
Learn more

Rent/Cloud

  • Rent for 48h to view
  • Buy Cloud Access for unlimited viewing via different devices
  • Synchronizing in the ReadCube Cloud
  • Printing and saving restrictions apply

Rental: USD 8.50
Cloud: USD 20.00


Select

Subscribe

  • Access to all articles of the subscribed year(s) guaranteed for 5 years
  • Unlimited re-access via Subscriber Login or MyKarger
  • Unrestricted printing, no saving restrictions for personal use
read more

Subcription rates


Select

* The final prices may differ from the prices shown due to specifics of VAT rules.

Article / Publication Details

First-Page Preview
Abstract of Basic Science

Received: March 24, 1992
Accepted: September 11, 1992
Published online: November 20, 2009
Issue release date: 1993

Number of Print Pages: 6
Number of Figures: 0
Number of Tables: 0

ISSN: 0008-6568 (Print)
eISSN: 1421-976X (Online)

For additional information: http://www.karger.com/CRE

Abstract

Tracer clearance studies were used to measure the amount and mobility of the water in human dental enamel. Slabs of enamel whose thickness ranged from 0.4 to 0.8 mm were equilibrated with tritiated water in dilute neutral buffer at 35°C for 1 week, rinsed and allowed to exchange at the same temperature with stirred unlabelled buffer. This was sampled and counted periodically to allow calculation of diffusion coefficients from the clearance rate. Exchangeable water amounted to 2.0 ± 0.4% w/w (6.0 ± 1.2% v/v). Some samples were masked on one side to double the diffusion distance. Diffusion calculations assuming homogeneous diffusion gave anomalous coefficients varying with sample thickness, indicating a more complex system was involved. In contrast, analysis assuming a biphasic distribution of diffusion pathways was much more successful. This assumed slow exchange from an inner pore system ‘A’ (probably associated with the prism cores) followed by much faster diffusion along a minority of larger pores ‘B’, such as exist at the prism boundaries. The ‘B’ pore-volumes were based on past studies of porosity in enamel, and the ‘A’ volumes on this work. Analysis gave an overall effective diffusion coefficient (De) for thick samples of 4.3 × 10––7 cm2 s––1. The results were consistent with a DB of 0.9 × 10––5 cm2 s––1 and a rate-constant (kAB) for exchange between the two pore systems which, if operating over a half-prism width (say 2 μm) would correspond to an ‘inner’ (DAB) diffusion coefficient in the region of 6 × 10––12 cm2 s––1.

© 1993 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Basic Science

Received: March 24, 1992
Accepted: September 11, 1992
Published online: November 20, 2009
Issue release date: 1993

Number of Print Pages: 6
Number of Figures: 0
Number of Tables: 0

ISSN: 0008-6568 (Print)
eISSN: 1421-976X (Online)

For additional information: http://www.karger.com/CRE


Copyright / Drug Dosage / Disclaimer

Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher or, in the case of photocopying, direct payment of a specified fee to the Copyright Clearance Center.
Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.