Effect of fluoride dentifrices on the microhardness of deciduous enamel surfaces.
OBJECTIVE
To evaluate the changes in the enamel surface microhardness following the application of various suspensions of Crest and Pooneh toothpastes with and without fluoride.


METHODS
Fifty-six enamel blocks of primary incisors were exposed to a pH-cycling regime consisting of demineralisation and remineralisation solution, then suspensions of the dentifrices Crest 1100, Crest 500, Pooneh 500, Pooneh without fluoride. Changes of the enamel surface microhardness in pre-demineralisation (initial), post-demineralisation (demineralised) and post-remineralisation (final) stages were measured for four groups and were analysed using the Student t test and one-way ANOVA.


RESULTS
The percentages of changes in surface microhardness for Crest 1100, Crest 500, Pooneh 500 and Pooneh without fluoride were 45.4, 35.4, 28.6 and 23.7, respectively.


CONCLUSIONS
Average changes of surface microhardness for Crest 1100 were significantly higher than Crest 500, Pooneh 500 and Pooneh without fluoride.
Department of Restorative Dentistry, University of Western Australia, Nedlands, WA, Australia.
Mitra
M
Shabanian
Seyed Ebrahim
SE
Jabarifar
Shirin
S
Salavati
Kazem
K
Khosravi
N
N
Tavakoli
Ali
A
Akhavan
D002327:Cariostatic Agents / Q000494:pharmacology*; D003743:Dental Enamel / Q000187:drug effects*; D003802:Dentifrices / Q000494:pharmacology*; D005459:Fluorides / Q000494:pharmacology*; D006244:Hardness; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007180:Incisor / Q000187:drug effects; D008422:Materials Testing; D012824:Silicic Acid / Q000494:pharmacology; D019228:Tooth Crown / Q000187:drug effects; D017001:Tooth Demineralization / Q000503:physiopathology; D014089:Tooth Remineralization; D014094:Tooth, Deciduous / Q000187:drug effects*; D014100:Toothpastes / Q000494:pharmacology
D002327:Cariostatic Agents; D003802:Dentifrices; D014100:Toothpastes; C546060:hydrated silica gel-based toothpaste; D012824:Silicic Acid; D005459:Fluorides