Impact of the acid flow rate on dentin erosion

Wiegand, A.; Stock, A.; Attin, R.; Werner, C.; Attin, T.

doi:10.1016/j.jdent.2006.04.002

« Previous Next »Journal of Dentistry
Volume 35, Issue 1 , Pages 21-27, January 2007

Impact of the acid flow rate on dentin erosion

Wiegand A.
- Department of Operative Dentistry, Preventive Dentistry and Periodontology, University of Göttingen, Robert-Koch-Str. 40, 37075 Göttingen, Germany
- Clinic for Preventive Dentistry, Periodontology and Cariology, University of Zürich, Plattenstrasse 11, CH-8032 Zürich, Switzerland
- Corresponding author. Tel.: +41 44 634 34 12; fax: +41 44 634 43 08.
Stock A.
- Department of Operative Dentistry, Preventive Dentistry and Periodontology, University of Göttingen, Robert-Koch-Str. 40, 37075 Göttingen, Germany
Attin R.
- Department of Operative Dentistry, Preventive Dentistry and Periodontology, University of Göttingen, Robert-Koch-Str. 40, 37075 Göttingen, Germany
Werner C.
- Department of Medical Statistics, University of Göttingen, Humboldallee 32, 37075 Göttingen, Germany
Attin T.
- Department of Operative Dentistry, Preventive Dentistry and Periodontology, University of Göttingen, Robert-Koch-Str. 40, 37075 Göttingen, Germany
- Clinic for Preventive Dentistry, Periodontology and Cariology, University of Zürich, Plattenstrasse 11, CH-8032 Zürich, Switzerland

Received 27 January 2006; received in revised form 22 March 2006; accepted 3 April 2006.

Abstract

Objective

The study aimed to evaluate the erosive effects of acids flowing with different velocities and duration on dentin previously pre-treated with distilled water or human saliva.

Methods

Bovine dentin surfaces were submitted to a 10min demineralisation with hydrochloric or citric acid (pH 2.3, 37°C) in an artificial mouth at flow rates of 3, 2.25, 1.5, 0.75 or 0.15ml/min or in 30ml of the respective acid without movement (each subgroup n=16 specimens). Prior to the demineralisation, half of the specimens of each group were either pre-treated with distilled water or human saliva for 120min. After 2, 5 and 10min demineralisation, profilometric traces of dentin loss were performed perpendicular to the direction of acid flow at three sites (A–C) with intervals of 500μm. The first profile (A) was taken in a distance of 1.5mm from the acid starting to flow over the sample. Thus, median dentin loss at each site was calculated and statistically analysed by five-way ANOVA.

Results

Dentin loss increased with increasing acid flow rate and demineralisation time and was higher for demineralisation with citric acid compared to hydrochloric acid. For given flow rates of 0.15 to 3ml/min, measurement of dentin loss yielded highest values for site A and decreasing values for sites B and C. For all groups, no significant differences of dentin loss were observed between specimens pre-treated with distilled water or human saliva.

Conclusion

Under the conditions of this study, both duration of demineralisation and acid flow rate but not pre-treatment with distilled water or saliva influence the extent of dentin erosion.

Keywords: Dentin, Erosion, Acid flow rate, Velocity, Citric acid, Hydrochloric acid, Saliva