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Effect 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

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Abstract

Statement of problem

The post space must be irrigated with solutions that do not interfere with the bond strength and enhance penetration into the dentinal tubules of self-etching resin cement. Which solution is best is unclear. Peracetic acid with different formulations appears to be a good option.

Purpose

The purpose of this in vitro study was to evaluate the effect of irrigating the fiber post space by using 1% peracetic acid (PA) at low (LH) or high (HH) hydrogen peroxide concentration on the bond strength and penetration into the dentinal tubules of RelyX U200 self-etching resin cement.

Material and methods

After intraroot preparation for fiber posts in 60 endodontically treated teeth, the specimens were divided into 4 groups (n=15) according to the irrigation protocol: CG (control), distilled water; NA (NaOCl), 2.5% sodium hypochlorite; LHPA, PA with a low concentration of hydrogen peroxide; and HHPA, PA with a high concentration of hydrogen peroxide. The fiber posts were then cemented with self-etching resin cement labeled with rhodamine. Cross sections of the thirds were obtained by confocal scanning microscopy and submitted to the push-out and cement penetration tests. The data obtained in the push-out tests were evaluated by using ANOVA and the Tukey post hoc test, and those data obtained in the confocal screening were evaluated by using the Kruskal-Wallis and Dunn (Bonferroni correction) tests (α=.05).

Results

Bond strength values in the cervical third of the CG were higher than those in NA (P=.035) but similar to those of the other groups (P=.05). In the other thirds, CG and LHPA values were similar to one another (P=.05) but higher than those of NA and HHPA (P<.001). The penetration rate assessed by confocal scanning microscopy revealed similar results in the cervical third for all groups (P=.075), except for NA which provided the lowest penetration. In the remaining thirds, CG and LHPA provided the highest penetration rate (P=.015).

Conclusions

The LHPA group had no negative effects on the bond strength and penetration into the dentinal tubules of the 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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