Bond strength of different endodontic sealers to dentin: push-out test.
OBJECTIVE
The aim of this in vitro study was to evaluate the bond strength of different root canal sealers to dentin.


METHODS
Forty extracted single-rooted human teeth were examined and the coronal and middle thirds of the canals were prepared with a 1.50 mm post drill (FibreKor Post System, Pentron). The teeth were allocated in two experimental groups, irrigated with 2.5% NaOCl+17% EDTA or saline solution (control group) and instrumented using Race rotary files (FKG) to a size #40 at the working length. Then, the groups were divided into four subgroups and filled with Epiphany sealer (Group 1), EndoREZ (Group 2), AH26 (Group 3) and Grossman's Sealer (Group 4). After 2 weeks of storage in 100% humidity at 37ºC, all teeth were sectioned transversally into 2-mm-thick discs. Push-out tests were performed at a cross-head speed of 1 mm/min using a universal testing machine. The maximum load at failure was recorded and expressed in MPa.


RESULTS
Means (±SD) in root canals irrigated with 2.5% NaOCl and 17% EDTA were: G1 (21.6±6.0), G2 (15.2±3.7), G3 (14.6±4.5) and G4 (11.7±4.1).Two-way ANOVA and Tukey's test showed the highest bond strength for the Epiphany's group (p< 0.01) when compared to the other tested sealers. Saline solution decreased the values of bond-strength (p<0.05) for all sealers.


CONCLUSIONS
Epiphany sealer presented higher bond strength values to dentin in both irrigating protocols, and the use of 2.5% NaOCl and 17% EDTA increased the bond strength values for all sealers.
University of Passo Fundo, Passo Fundo, RS, Brazil.
João Vicente Baroni
JV
Barbizam
Martin
M
Trope
Mario
M
Tanomaru-Filho
Erica Cappelletto Nogueira
EC
Teixeira
Fabricio Batista
FB
Teixeira
D000704:Analysis of Variance; D001729:Bismuth / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods*; D003804:Dentin / Q000737:chemistry*; D004492:Edetic Acid / Q000737:chemistry; D004853:Epoxy Resins / Q000737:chemistry; D006801:Humans; D008422:Materials Testing; D012387:Root Canal Filling Materials / Q000737:chemistry*; D012389:Root Canal Obturation / Q000379:methods; D018915:Root Canal Preparation / Q000379:methods; D012834:Silver / Q000737:chemistry; D016369:Smear Layer; D012973:Sodium Hypochlorite / Q000737:chemistry; D014025:Titanium / Q000737:chemistry; D015035:Zinc Oxide-Eugenol Cement / Q000737:chemistry
D003188:Composite Resins; C481259:EndoRez; D004853:Epoxy Resins; D012387:Root Canal Filling Materials; D015035:Zinc Oxide-Eugenol Cement; C486893:epiphany sealer; C045432:Grossman's sealer; D012834:Silver; C028044:epoxy resin AH-26; D004492:Edetic Acid; D014025:Titanium; D012973:Sodium Hypochlorite; D001729:Bismuth