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Research Article
- Physicochemical properties, cytotoxicity and penetration into dentinal tubules of sodium hypochlorite with and without surfactants
- Hernán Coaguila-Llerena, Isadora Barbieri, Mário Tanomaru-Filho, Renato de Toledo Leonardo, Ana Paula Ramos, Gisele Faria
- Restor Dent Endod 2020;45(4):e47. Published online September 10, 2020
- DOI: https://doi.org/10.5395/rde.2020.45.e47
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Abstract
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ePub Objectives The aim of this study was to assess the physicochemical properties, cytotoxicity and penetration into dentinal tubules of ChlorCid™ Surf (3% sodium hypochlorite [NaOCl] with surfactant) in comparison to ChlorCid™ (3% NaOCl without surfactant).
Materials and Methods The physicochemical properties evaluated were pH, surface tension, free available chlorine (FAC) and contact angle. Cytotoxicity was evaluated in L929 fibroblasts exposed to the solutions by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide and neutral red assays. Assessment of penetration into dentinal tubules was performed by staining single-rooted permanent human teeth with crystal violet (
n = 9), which were irrigated with the solutions and analyzed in cervical, middle and apical segments. Data were analyzed by one-way analysis of variance (ANOVA) and Tukey'spost -test, 2-way ANOVA and Bonferroni'spost -test ort -test (α = 0.05).Results ChlorCid™ Surf and ChlorCid™ FAC values were close to those indicated by the manufacturer. ChlorCid™ Surf showed lower surface tension and contact angle on dentin, and higher pH than ChlorCid™ (
p < 0.05). The penetration of ChlorCid™ Surf was higher in cervical and middle segments, compared with ChlorCid™ (p < 0.05). There was no difference in irrigant cytotoxicity (p > 0.05).Conclusions ChlorCid™ Surf showed lower surface tension, lower contact angle on root canal dentin, higher penetration into dentinal tubules and more alkaline pH, compared with ChlorCid™. However, both solutions showed similar cytotoxicity and FAC content.
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Original Article
- The effect of bonding resin on bond strength of dual-cure resin cements
- Duck-Su Kim, Sang-Hyuk Park, Gi-Woon Choi, Kyung-Kyu Choi
- J Korean Acad Conserv Dent 2007;32(5):426-436. Published online September 30, 2007
- DOI: https://doi.org/10.5395/JKACD.2007.32.5.426
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Abstract
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The objective of this study is to evaluate the effect of an additional application of bonding resin on the bond strength of resin luting cements in both the light-cure (LC) and self-cure (SC) modes by means of the µTBS tests.
Three combinations of One-Step Plus with Choice, Single Bond with Rely X ARC, and One-Up Bond F with Bistite II were used. D/E resin and Pre-Bond resin were used for the additional application. Twelve experimental groups were made. Three mandibular 3rd molars were used in each group. Indirect composite blocks were cemented on the tooth surface. 1 × 1 mm2 dentin-composite beam for µTBS testing were made and tested.
When total-etching dentin adhesives were used, an additional application of the bonding resin increased the bond strength (
P < 0.05). However, this additional application didn't influence the bond strength of self-etching dentin adhesives (P > 0.05).In conclusion, the results suggest that an additional application of the bonding resin increases bond strength and enhances quality of bonding when using total-etching dentin adhesives.
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