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Effects of Immersion Media and Repolishing on Color Stability and Superficial Morphology of Nanofilled Composite Resin

Published online by Cambridge University Press:  03 June 2014

Ana Luísa Botta Martins de Oliveira*
Affiliation:
Department of Social Dentistry, Araraquara School of Dentistry, University of Sao Paulo State, Sao Paulo 14801-903, Brazil
Ana Carolina Botta
Affiliation:
Stony Brook School of Dental Medicine, Department of General Dentistry, NY 11794, USA
Juliana Álvares Duarte Bonini Campos
Affiliation:
Department of Social Dentistry, Araraquara School of Dentistry, University of Sao Paulo State, Sao Paulo 14801-903, Brazil
Patrícia Petromilli Nordi Sasso Garcia
Affiliation:
Department of Social Dentistry, Araraquara School of Dentistry, University of Sao Paulo State, Sao Paulo 14801-903, Brazil
*
*Corresponding author. analuisabotta@hotmail.com
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Abstract

This study evaluated the influence of fluoride mouth rinses and repolishing on the superficial morphology and color stability of nanofilled resin. About 150 specimens were prepared and polished using aluminum oxide discs for 15 s with a pressure of 2 kg. The experimental groups were divided according to the immersion medium (artificial saliva, 0.5% sodium fluoride, Fluordent Reach, Oral B, Fluorgard) and repolishing procedure (without and with). The specimens were continuously immersed for 1 week. Thereafter, half of each sample was repolished. A color reading was performed after 24 h of immersion in the artificial saliva baseline, after continuous immersion, and after repolishing. The superficial morphology was examined using scanning electron microscopy (SEM) in a qualitative way. Color change (∆E) data were submitted to a mixed analysis of variance using a Shapiro–Wilk test (p>0.05 for the different immersion media) and Sidak’s test (p<0.05 for the differences between groups). In the interaction between the repolishing and the immersion media, Fluorgard showed a statistical difference between the ∆E values with and without repolishing (p<0.0001). On the SEM observations, both Fluordent Reach and Fluorgard caused degradation of the superficial resinous matrix of the composite after continuous immersion. This matrix was removed after repolishing.

Type
Biological Applications
Copyright
© Microscopy Society of America 2014 

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