Smear layer dissolution by XXXX of low concentration.

@entity3880 @entity1 @entity3879 @entity1098
AIM: To test the effect of a noncaustic concentration of @entity3879 ( @entity3880 ) in a standardized smear layer model. METHODOLOGY: The smear layer dissolution kinetics of 0.5% @entity3880 on @entity1 dentine were compared to those of 2.25% @entity3880 and 17% @entity1098 ( @entity1098 ) solutions. Coronal dentine discs were prepared from six @entity1 maxillary molars. A standardized smear layer was produced on the pulpal side of each disc. The smear layer-covered surface was divided into three similar areas and then exposed to one of the three solutions tested. Co-site image sequences (around 40, 500  ) of the specific areas were obtained after four cumulative demineralisation times (15, 30, 60 and 180 s). An image processing and analysis sequence measured sets of images, providing data of area fraction (AF, dentine-free area in % of total analysis area). A general linear model for repeated measures was used to verify the influence of time and solution type over the change in AF from baseline (/\AF). RESULTS: Overall, @entity1098 and 2.25% @entity3880 produced higher /\AF values than the 0.5% @entity3880 solution (P < 0.05). No significant difference was observed in /\AF between 15 s and 30 s (P > 0.05). After 60 s of etching, all tested solutions produced similar /\AF (P > 0.05), whereas at 180 s, /\AF of both @entity1098 and 2.25% @entity3880 continued to increase (P > 0.05). CONCLUSIONS: After 60 s of contact, the 0.5% @entity3880 solution dissolved smear layer as well as 2.25% @entity3880 and 17% @entity1098 .
