0798 Bleaching effect on dental enamel demineralization
A. MIELCZAREK1, A. KWIATKOWSKA1, I. STRUZYCKA1, and M. KWASNY2, 1Medical University of Warsaw, Warsaw, Poland, 2Military University of Warsaw, Warsaw, Poland

Purpose: The purpose of this study was to evaluate the effect of tooth whitening on susceptibility of enamel erosion. Material and methods: 15 enamel samples as test and 15 enamel samples as control group were used in the study. In preliminary phase all samples were rinsed in supersaturated HA solution, incubated in human saliva and soaked in fluoride toothpaste solution. Samples from test group were bleached with 14% H2O2 Crest Whitestrips Supreme, and control specimens were rinsed in distilled water. All samples were exposed to Coca-Cola for 5minutes for erosion induction. Samples were examined according to colour (Lab), roughness (Ra) and microhardness (MH). Results: The analysis of the profile and hardness parameters revealed no effect of bleaching procedure on the structure of dental enamel. An increase of Ra value from 0,09 to 1,13 in bleached group, and from 0,08 to 1,15 in control group was observed after erosion induction. Simultaneously, after demineralization a decrease of mean MH value in test group from 291,0 (16,6) do 193,6(21,3) and from 284,3 (11,2) do 180,7 (19,6) in control group occurred. Differences were comparable in both experimental groups. Conclusions: These results showed that tooth bleaching with 14% H2O2 does not change significantly enamel roughness and microhardness and does not increase the susceptibility of enamel to acid erosion. Study sponsored by Grant 2PO5B 067 29

Seq #85 - Mineralized Tissue Posters II
11:30 AM-1:00 PM, Friday, September 12, 2008 Queen Elizabeth II Conference Centre Poster Hall 1

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