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ORIGINAL ARTICLE
Year : 2018  |  Volume : 9  |  Issue : 1  |  Page : 26-30

Influence of infected root dentin on the bond strength of a self-adhesive resin cement


1 Department of Conservative Dentistry, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, RS; Department of Dentistry, Federal University of Santa Catarina (UFSC), Florianópolis, SC, Brazil
2 Department of Dentistry, Federal University of Santa Catarina (UFSC), Florianópolis, SC, Brazil
3 Department of Dentistry, Federal University of Santa Catarina (UFSC), Florianópolis; University of Southern Santa Catarina (Unisul), Palhoça, SC, Brazil

Correspondence Address:
Débora Delai
DDS, MSc, School of Dentistry, Department of Conservative Dentistry, Federal University of Rio Grande do Sul, UFRGS, Porto Alegre, RS
Brazil
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ccd.ccd_683_17

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Aim: The aim of this study was to determine the bond strength (BS) of a self-adhesive resin cement to the contaminated root dentin. Materials and Methods: The crown and apical third of twenty single-rooted teeth were removed. The root canals were flared and 1-mm-thick root sections were obtained. The sections were rinsed, dried, and sterilized. The control group (n=20) was composed of one section of each third, which remained immersed in sterile trypticase soy broth (TSB) for 2 months. The other sections comprised the experimental group (n = 40) and were immersed in a suspension of Enterococcus faecalis. The culture medium was changed at every 4 days for 2 months. The sections were rinsed with distilled water, dried, and the root canal space was fi lled with the self-adhesive resin cement RelyX™ U200. After 24 h, the push-out test was performed and the types of interface failure were observed on a stereo microscope. Statistical Analysis: Data were statistically analyzed by the nonparametric Mann–Whitney test (α=5%). Results: A significant reduction was observed in the BS of resin cement to the contaminated dentin compared to the healthy dentin, for both thirds analyzed (P < 0.05). The BS was signifi cantly greater at the cervical third compared to the middle third for specimens in the experimental group (P < 0.05). Adhesive and mixed failures were observed more frequently in specimens contaminated with E. faecalis. Conclusion: Bacterial contamination negatively infl uenced the BS of the self-adhesive resin cement to the root dentin, and there was a predominance of adhesive and mixed failures.


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