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Title: The effect of immediate or delayed brushing on enamel following exposure to erosive and cariogenic acids : an in vitro study
Author: AlKazemi, Layla A.
Awarding Body: University of Leeds
Current Institution: University of Leeds
Date of Award: 2012
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Aim of the research: This in vitro study aimed to investigate tooth surface loss with immediate or delayed brushing after exposure to acids associated with either erosive tooth surface loss (citric acid) or that associated with a cariogenic challenge (acetic acid). Study design: A randomised longitudinal in vitro study. Materials and method: In this in vitro study, 60 enamel slabs were allocated randomly to 4 groups; citric acid with immediate brushing (CIB), citric acid with 30 minutes delayed brushing (COB), acetic acid with immediate brushing (AlB) and acetic acid with 30 minutes delayed brushing (ADB). During the 28-days slabs in all groups were subjected to an abrasive challenge 4 times per cycle day with brushing machine using brushing load of 200g. They were immersed in acid 5 times per day cycle. Measurements of enamel surface loss were done using surtace profilometry on 3 different intervals during the cycle 7, 14 and 28 days. In addition, in the acetic acid group surface microhardness was also used for the final assessment at day 28. Results: Using repeated measures ANOVA no significant difference between both immediate and 30 minutes delayed brushing was detected. Result also indicated that the effect of time was found to achieve statistical significance (p<0 .05) within the multivariate tests conducted, with tooth surtace loss increasing progressively from 7-28 day test period. Also there was significantly (p<0.05) more tooth surface loss evident with citric acid both with immediate and delayed brushing compared with acetic acid. Conclusion: It was shown that 30 minutes remineralisation period had no effect when compared to immediate brushing. This was true for both acids (citric and acetic). It was also concluded there was significantly more tooth surface loss with citric acid compared with that acetic acid.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available