Effect of Irrigant Solutions on Shear Bond Strength of Resin Cements in Root Canal
The purpose of this study was to evaluate the effect of irrigant solutions used before fixing post and core on shear bond strength of two resin cements in root canal. Thirty single roots of human upper anterior teeth were used in this study. Each root was sectioned at the mid-point with a diamond disc. A two millimeters thick disc-shaped sample was sliced from the cut end of each root section. A Profile® rotary instrument was used to prepare the canal surface of each specimen before filling the canal with Grossman®’s sealer. The specimens were left at 37°C for one week. Then the Grossman®’s sealer was removed from all specimens with Peeso reamer No.4. The specimens were then randomly divided into six groups of ten. The specimens in groups 1, 2 and 3 were soaked in one of three different irrigant solutions (0.9% normal saline solution, 2.5% NaOCl and 2% chlorhexidine) for one minute. Then the root canals were filled with Variolink II®resin cement. The specimens in groups 4, 5 and 6 were soaked in one of the same irrigant solutions as those in groups 1, 2 and 3 for one minute. These canals were then filled with RelyX™ Unicem resin cement. The shear bond strength of both resin cements was tested by an Instron® testing machine. The data were analyzed statistically using one-way ANOVA (p < 0.05) and Tukey multiple comparison test. The results of this study indicate that chlorhexidine and NaOCl have significant negative effects on the bond strength of both resin cements when compared with normal saline solution (p < 0.05).
1. Rosentritt M, Fürer C, Behr M, Lang R, Handel G.Comparison of in vitro fracture strength of metallic and tooth coloured posts and cores. J Oral Rehabil 2000; 27: 595-601.
2. Cohen S , Burns RC.Cleaning and shaping the root canal system : Pathways of the pulp, 7th ed. St Louis, Mosby - Year Book, USA; 1998: 206-9.
3. Mayhew JT, Windchy AM, Goldsmith LJ, Gettleman L. Effect of root canal sealers and irrigation agents on retention of preformed posts luted with a resin cement. J Endod 2000; 6: 341-4.
4. Prisco D, Santis RD, Mollien F, Ambrosio L, Rengo S, Nicolais L. Fiber post adhesion to resin luting cements in the restoration of endodontically treated teeth. Oper Dent 2003; 28: 515-21.
5. Hibi. Hibitane 5%concentrate. [cited 2005 Dec 1] Available from: http://www.antiseptic.com
6. Turkun M, Cal E, Toman M, Tokavul S. Effects of dentin disinfectants on the shear bond strength of all-ceramics to dentin. Oper Dent 2005; 30: 453-60.
7. White RR, Hays GL, Janer LR. Residual antimicrobial activity after canal irrigation with chlorhexidine endodontic irrigant used with sodium hypochlorite. J Endod 1997; 23: 229-31.
8. Leonardo MR, Filho MT, Silva LAB, Filho PN, Bonifacio KC, Ito IY. In vivo antimicrobial activity of 2% chlorhexidine used as a root canal irrigating solution. J Endod 1999; 25: 167-71.
9. Ari H, Yas§ar E, Belli/ S.Effects of NaOCl on bond strengths of resin cements to root canal dentin. J Endod 2003; 29: 248-51.
10. Gürgan S, Bclay S, Kiremitci A. Effect of disinfectant application methods on the bond strength of composite to dentin. J Oral Rehabil 1999; 26: 836-40.