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faculty: "ACTA" and publication year: "2009"
| Authors||M.S. Cenci, T. Pereira-Cenci, J.A. Cury, J.M. ten Cate|
|Title||Relationship between gap size and dentine secondary caries formation assessed in a microcosm biofilm model|
|Abstract||Secondary caries can develop at the tooth-restoration interface, depending on the presence of a gap and its size, but this process could be inhibited by fluoride. The aim of this study was to assess the relationship between gap size and dentine secondary caries adjacent to composite resin (CR) or glass ionomer (GI) restorations, using a microcosm biofilm model in a constant depth film fermentor (CDFF). Dentine discs restored with CR (Z250) or GI (Vitremer) with gap sizes of 0, 50, 100, 180 or 250 μm were mounted on the CDFF. Microcosm biofilms were formed on the restored discs and daily subjected to 8 pulses of 10% sucrose solution. On the 18th day, dentine mineral loss and lesion depth around the restorations were determined by transverse microradiography.The effect of gap size was overall not statistically significant either with regard to mineral loss (p = 0.449) or lesion depth (p = 0.328), but greater mineral loss and lesion depth were found adjacent to CR than to GI (p < 0.001). However, Spearman correlation showed that mineral loss and lesion depth increased with gap size for CR (p < 0.001) but not for GI (p > 0.05). The findings support the conclusion that fluoride released from GI inhibits dentine demineralization adjacent to restorations, irrespective of gap width.|
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