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Powered brushing and fluoride in a streptococcus mutans typodont biofilm

Powered brushing and fluoride in a streptococcus mutans typodont biofilm
Powered brushing and fluoride in a streptococcus mutans typodont biofilm
Objectives: to develop a typodont biofilm model to measure the effect of powered brushing on biofilm removal and the delivery of fluoride into biofilm remaining in accessible areas in an anatomically relevant geometry.

Methods: streptococcus mutans biofilms were grown on sections of a typodont (A-PZ Frasaco) for three or six days. The typodont sections contained either incisors and cuspids or premolars and molars. The biofilm was observed on various surfaces before and after brushing facial surfaces for 10 seconds with a powered toothbrush (Philips Sonicare FlexCare), according to manufacturer instructions. A pH microelectrode was used to measure profiles in the biofilm. To measure profiles of free fluoride ion in the biofilm we constructed a fluoride microelectrode. The electrode was calibrated and profiles measured in an agar gel.

Results: biofilm grew on the hard plastic tooth and soft gum materials of the typodont on all surfaces. The pH microelectrode showed that acid was produced in the presence of sucrose due to acid respiration. The pH dropped from approximately 7 to as low as 5.5. After hand brushing the typodont was reexamined. The facial surfaces were almost devoid of biofilm, however, there was still biofilm remaining in the interproximal spaces and molar occlusal surfaces. The fluoride microelectrode had a tip diameter of 5 µm and had a measurement range from approximately 1 to 1000 ppm F-, in a log-linear relationship.

Conclusion: the typodont model is a good system for quantifying biofilm removal and measuring remaining biofilm in “hard to reach locations” in an anatomically relevant model. Microelectrodes can be used to measure local activity and zones of acid production. The fluoride microelectrode has potential for measuring the local delivery of fluoride to biofilm on various typodont surfaces
Stoodley, P.
08614665-92a9-4466-806e-20c6daeb483f
Nistico, L.
11f06ab1-8a7b-4957-be24-1c0027b5bd64
Longwell, M.
37efd2cf-0784-4790-9755-79304d9e48a5
Gieseke, A.
9e64f3c8-aced-493d-8efc-e9868dcb04d0
Debeer, D.
78a5fcaa-e0f4-413b-83b9-97f7281b3055
Aspiras, M.
198433cd-5075-49d0-ac43-c305c35dc4f3
DeJager, M.
af69cc09-1a11-406b-ada7-1e36badc916e
Stoodley, P.
08614665-92a9-4466-806e-20c6daeb483f
Nistico, L.
11f06ab1-8a7b-4957-be24-1c0027b5bd64
Longwell, M.
37efd2cf-0784-4790-9755-79304d9e48a5
Gieseke, A.
9e64f3c8-aced-493d-8efc-e9868dcb04d0
Debeer, D.
78a5fcaa-e0f4-413b-83b9-97f7281b3055
Aspiras, M.
198433cd-5075-49d0-ac43-c305c35dc4f3
DeJager, M.
af69cc09-1a11-406b-ada7-1e36badc916e

Stoodley, P., Nistico, L., Longwell, M., Gieseke, A., Debeer, D., Aspiras, M. and DeJager, M. (2009) Powered brushing and fluoride in a streptococcus mutans typodont biofilm. International Association for Dental Research (IADR) General Meeting, Miami, USA. 31 Mar - 03 Apr 2009.

Record type: Conference or Workshop Item (Poster)

Abstract

Objectives: to develop a typodont biofilm model to measure the effect of powered brushing on biofilm removal and the delivery of fluoride into biofilm remaining in accessible areas in an anatomically relevant geometry.

Methods: streptococcus mutans biofilms were grown on sections of a typodont (A-PZ Frasaco) for three or six days. The typodont sections contained either incisors and cuspids or premolars and molars. The biofilm was observed on various surfaces before and after brushing facial surfaces for 10 seconds with a powered toothbrush (Philips Sonicare FlexCare), according to manufacturer instructions. A pH microelectrode was used to measure profiles in the biofilm. To measure profiles of free fluoride ion in the biofilm we constructed a fluoride microelectrode. The electrode was calibrated and profiles measured in an agar gel.

Results: biofilm grew on the hard plastic tooth and soft gum materials of the typodont on all surfaces. The pH microelectrode showed that acid was produced in the presence of sucrose due to acid respiration. The pH dropped from approximately 7 to as low as 5.5. After hand brushing the typodont was reexamined. The facial surfaces were almost devoid of biofilm, however, there was still biofilm remaining in the interproximal spaces and molar occlusal surfaces. The fluoride microelectrode had a tip diameter of 5 µm and had a measurement range from approximately 1 to 1000 ppm F-, in a log-linear relationship.

Conclusion: the typodont model is a good system for quantifying biofilm removal and measuring remaining biofilm in “hard to reach locations” in an anatomically relevant model. Microelectrodes can be used to measure local activity and zones of acid production. The fluoride microelectrode has potential for measuring the local delivery of fluoride to biofilm on various typodont surfaces

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More information

Published date: April 2009
Additional Information: The National Centre for Advanced Tribology at Southampton (nCATS)
Venue - Dates: International Association for Dental Research (IADR) General Meeting, Miami, USA, 2009-03-31 - 2009-04-03

Identifiers

Local EPrints ID: 71684
URI: http://eprints.soton.ac.uk/id/eprint/71684
PURE UUID: c5918e5f-6805-48fa-99f0-0282e589e327
ORCID for P. Stoodley: ORCID iD orcid.org/0000-0001-6069-273X

Catalogue record

Date deposited: 21 Dec 2009
Last modified: 11 Dec 2021 04:24

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Contributors

Author: P. Stoodley ORCID iD
Author: L. Nistico
Author: M. Longwell
Author: A. Gieseke
Author: D. Debeer
Author: M. Aspiras
Author: M. DeJager

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