Original Paper

Effect of Microleakage and Fluoride on Enamel-Dentine Demineralization around Restorations
M.S. Cenci^{a, b}, L.M.A. Tenuta^a, T. Pereira-Cenci^{a, b}, A.A. Del Bel Cury^a, J.M. ten Cate^b, J.A. Cury<sup>a

a</sup>Piracicaba Dental School, University of Campinas, Piracicaba, Brazil;
^bAcademic Centre for Dentistry Amsterdam (ACTA), Amsterdam, The Netherlands

Address of Corresponding Author

Caries Res 2008;42:369-379 (DOI: 10.1159/000151663)

  Key Words

• Biofilm
• Demineralization
• Fluoride
• Marginal gap
• Microleakage
• Secondary (recurrent) caries

  Abstract

There is no consensus about an association between microleakage and secondary caries, especially considering the presence of fluoride (F) at the tooth/restoration interface. Thus, a randomized, double-blind, crossover study was carried out to evaluate in situ the effect of microleakage on caries around enamel-dentine restorations in the presence of F from dental materials or dentifrice, either alone or in combination. In 4 phases of 14 days each, 14 volunteers wore palatal devices containing dental slabs restored with composite resin (CR) or resin-modified glass ionomer cement (GI). Restorations were made without leakage (L–), following the recommended adhesive procedures, or with leakage (L+), in the absence of adhesive procedures. Plaque-like biofilm (PLB) was left to accumulate on the restored slabs, which were exposed extraorally to a 20% sucrose solution 10×/day. The volunteers used a non-F (NF) or an F (FD) dentifrice 3×/day, depending on the experimental phase. No differences were found between L+ or L– restorations (p > 0.05). Higher demineralization in both enamel and dentine around CR restorations was observed under NF (p < 0.05). F concentration was higher in the fluid of PLB exposed to FD or formed onto GI restoration (p < 0.05). These results suggest that while microleakage does not affect caries development, GI or FD may maintain increased F levels in the PLB, thereby decreasing caries progression.

Copyright © 2008 S. Karger AG, Basel

  Author Contacts

Jaime A. Cury
Piracicaba Dental School
PO Box 52
13414-903 Piracicaba, SP (Brazil)
Tel./Fax +55 19 2106 5302, E-Mail jcury@fop.unicamp.br

  Article Information

Received: February 4, 2008
Accepted after revision: July 3, 2008
Published online: August 28, 2008
Number of Print Pages : 11
Number of Figures : 3, Number of Tables : 4, Number of References : 30