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Published on: December 20, 2024
Influence of Infected Root Dentin on the Bond Strength of a Self-adhesive Resin Cement
Débora Delai1,2, Maybell Tedesco2, Josiane de Almeida2,3
1Department of Conservative Dentistry, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil.
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 filled 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 significantly 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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