Effect of calcium hydroxide intracanal dressing on the bond strength of a resin-based endodontic sealer

Brazilian Dental Journal

João Vicente Baroni Barbizam²  Martin Trope²  Érica C.n. Teixeira²  Mário Tanomaru-filho¹  Fabrício B. Teixeira² 

[1] ,University of North Carolina Dental School Department of EndodonticsChapel Hill NC ,USA

关键词: adhesion;    bond strength;    calcium hydroxide;    root canal sealers;   

DOI  :  10.1590/S0103-64402008000300009

来源: SciELO

【 摘 要 】

The aim of this in vitro study was to evaluate the bond strength of Epiphany™ resin-based sealer to dentin walls after placement of calcium hydroxide [Ca(OH)2] dressings. Fifteen extracted single-rooted human teeth were instrumented using 2.5% NaOCl + EDTA as irrigants. The teeth were randomly assigned to 3 groups (n=5), according to the intracanal dressing: G1= Ca(OH)2 + saline; G2= Ca(OH)2 + 2% chlorhexidine gluconate (CHX) gel; and G3= saline (control). After 10 days of storage in 100% humidity at 37ºC, the dressings were removed and the root canals were filled with Epiphany™ sealer. After additional 48 h of storage, the specimens were sectioned transversally into 2-mm-thick discs. Push-out tests were performed (1 mm/min, Instron 4411) and the maximum loads at failure were recorded in MPa. One-way ANOVA and Newman-Keuls tests showed a statistically significant decrease in bond strength when a Ca(OH)2 dressing was used before root canal filling with Epiphany™ (G1= 10.18 ± 1.99 and G2= 9.98 ± 2.97) compared to the control group (13.82 ± 3.9) (p< 0.05). It may be concluded that the use of Ca(OH)2 as an intracanal dressing material affected the adhesion of Epiphany™ to the root canal walls, but even though the values were within the acceptable range found in the literature.

【 授权许可】

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