Smear layer dissolution by peracetic acid of low concentration

被引:38
作者
De-Deus, G. [1 ]
Souza, E. M. [3 ]
Marins, J. R. [1 ]
Reis, C. [1 ]
Paciornik, S. [2 ]
Zehnder, M. [4 ]
机构
[1] Veiga Almeida Univ UVA, Rio De Janeiro, Brazil
[2] Pontificia Univ Catolica Rio de Janeiro, Dept Mat Sci & Met, Rio De Janeiro, Brazil
[3] Univ Ctr Maranhao UNICEUMA, Postgrad Sect, Sao Luis, MA, Brazil
[4] Univ Zurich, Ctr Dent Med, Div Endodontol, Dept Prevent Dent Periodontol & Cariol, Zurich, Switzerland
关键词
co-site microscopy; dentine; peracetic acid; smear layer; SITE OPTICAL MICROSCOPY; ROOT DENTIN; DEMINERALIZATION; IRRIGATION; EDTA;
D O I
10.1111/j.1365-2591.2010.01847.x
中图分类号
R78 [口腔科学];
学科分类号
100302 [口腔临床医学];
摘要
P>Aim To test the effect of a noncaustic concentration of peracetic acid (PAA) in a standardized smear layer model. Methodology The smear layer dissolution kinetics of 0.5% PAA on human dentine were compared to those of 2.25% PAA and 17% ethylenediaminetetraacetic acid (EDTA) solutions. Coronal dentine discs were prepared from six human 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, 500x) 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 (Delta AF). Results Overall, EDTA and 2.25% PAA produced higher Delta AF values than the 0.5% PAA solution (P < 0.05). No significant difference was observed in Delta AF between 15 s and 30 s (P > 0.05). After 60 s of etching, all tested solutions produced similar Delta AF (P > 0.05), whereas at 180 s, Delta AF of both EDTA and 2.25% PAA continued to increase (P > 0.05). Conclusions After 60 s of contact, the 0.5% PAA solution dissolved smear layer as well as 2.25% PAA and 17% EDTA.
引用
收藏
页码:485 / 490
页数:6
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