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International Poster Journal of Dentistry and Oral Medicine
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Int Poster J Dent Oral Med 5 (2003), No. 4     15. Dec. 2003
Int Poster J Dent Oral Med 5 (2003), No. 4  (15.12.2003)

Poster 199, Language: English


The Effect of Fluoride Release from a Bonding Material on Nanoleakage
Pioch, Thomas/Wurst, Marcus/Duschner, Heinz/Staehle, Hans Jörg/Dörfer, Christof E.
Objectives: To evaluate the fluoride releasing effect of a dentin bonding material over time on nanoleakage. Material and Methods: Standardized class-V cavities were prepared in 60 extracted human molars. 30 cavities were filled with composite (Spectrum) using the Prime&Bond NT bonding system (containing cetylamine hydrofluoride). 30 teeth were filled with the same composite and an experimental Prime&Bond NT without fluoride content. Prior to the examination 15 teeth per group were stored for 24 h in water and the remaining 15 teeth per group were stored for 6 month. After storage the teeth were exposed to a 1% rhodamin B solution for 24 h at 20°C, rinsed in water for 60 s and sectioned parallel to the tooth axis, dividing the restorations into two parts. A confocal laser scanning microscope (CLSM) was used in fluorescence mode to visualize a layer 10 µm below the prepared surface. The lengths of the penetrated pathways were measured. Results: High resolution CLSM images demonstrated a penetration pathway which was located at the junction between hybrid layer and dentin. Storage for 24 h resulted in penetration lengths of 53 ± 59 µm. After 6 month the penetration length was 74 ± 40 µm for the fluoride releasing bonding agent and 75 ± 52 µm for the experimental bond without fluoride content. Storage for 6 month slightly increased dye penetration lengths, but the difference is not statistically significant (p=0.09 with fluoride release and p=0.11 without fluoride release; Mann-Withney U-test). It is concluded that the penetrations observed are a result of nanoleakage and the fluoride release has no effect on nanoleakage.

Keywords: dentin bonding agent, nanoleakage, fluoride

Conference/Exhibition:
25th - 28th September 2002
European Festival of Oral Science, PEF
Cardiff, Wales, UK