Research and EducationEffect of fiber post space irrigation with different peracetic acid formulations on the bond strength and penetration into the dentinal tubules of self-etching resin cement
Section snippets
Material and methods
The research project was reviewed and approved by the research ethics committee of the State University of Sao Paulo. Sixty human maxillary central incisors with similar root anatomy, recently extracted because of periodontal disease, were stored in 0.1% thymol solution at 4 °C as described by Belizário et al.42 After the teeth had been rinsed under running water, the teeth were sectioned transversely along the root axis by using a diamond disk (IsoMet 2000; Buehler) under refrigeration. The
Results
Table 1 shows the mean and standard deviation of the bond strength values (in MPa) in the cervical, middle, and apical thirds. Of the self-etching resin cements, only CG showed higher mean bond strength to root dentin in the cervical third than NA (P=.035). The other groups were similar to one another (P=.06). In the middle third and apical root, CG and LHPA showed similar values (P=.051), and these were higher than those of NA and HH (P=.001), which, in turn, were similar to one another (P
Discussion
The null hypothesis was rejected because the solution with a high concentration of hydrogen peroxide had a negative effect on the parameters evaluated in the middle and apical thirds. In contrast, the 1% peracetic acid solution at a low concentration of hydrogen peroxide showed no effect on the bond strength in the dentin and penetration into the dentinal tubule of the self-etching resin cement (U200), no matter which third was evaluated.
The bond strength of adhesive resin cement to root dentin
Conclusions
Within the limitations of this in vitro study, the following conclusions were drawn:
- 1.
The 1% peracetic acid solution at a low hydrogen peroxide concentration did not interfere with the bond strength of the self-etching resin cement (U200) to dentin.
- 2.
The solution with low hydrogen peroxide concentration did not interfere in the penetration into the dentinal tubules, regardless of the third of the root evaluated.
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