Abstract
BackgroundDifferent disinfectant solutions or medications are indicated prior fiber post bonding procedures.The aim was to evaluate the effect of different pretreatments of root canal on the bond strength of a fiber post luted to dentin with self-adhesive resin cement.Material and MethodsForty-eight single-rooted mandibular premolars were endodontically treated and prepared to receive fiber posts. Teeth were assigned to four groups (n=12). Root canal walls were subjected to no pretreatment (G1 - control); irrigation with 10 mL of 5% sodium hypochlorite (NaOCl) (G2); 10 mL of 17% ethylenediaminetetraacetic acid (EDTA) associated with 10 mL of 5% NaOCl (G3); or 10 mL of 17% EDTA (G4). Fiber posts were bonded with self-adhesive cement. After the roots were sectioned into slices, a push-out bond strength test was performed using a universal testing machine at crosshead speed of 0.5 mm/min. Bond strength data were recorded and expressed in MPa and analyzed by Anova (5%) and Tukey Test (5%).ResultsIt was found that G2 (9.36 MPa) and G4 (6.33 MPa) were significantly different among themselves and statistically inferior to G1 (13.93 MPa) while G3 (14.31 MPa) was statistically similar to G1 (control) and superior to G2 and G4.ConclusionsIrrigation with 17% EDTA associated with 5% NaOCl showed increased bond strength compared with the same solutions used alone. Key words:Self-adhesive, Dentin, Push-out, Bonding.
Highlights
Posts and cores are commonly used in endodontically treated teeth suffering from excessive coronal tooth structure loss [1,2,3]
It is suggested that the use of some disinfectant solutions or medications during root canal preparation may have an adverse effect on the bond strength between fiber post and root dentin [13,14,15]
Ethylenediaminetetraacetic acid (EDTA) is another agent indicated for smear layer removal, as it reacts with calcium ions in dentin and forms soluble calcium chelates [16]
Summary
Posts and cores are commonly used in endodontically treated teeth suffering from excessive coronal tooth structure loss [1,2,3]. Sodium hypochlorite (NaOCl), the most commonly used irrigant, is considered an excellent proteolytic agent and leads to greater dissolution of organic compounds (mainly collagen) in dentin during root canal therapy It does not completely remove the smear layer [16,17]. Given the different possibilities of final root canal irrigation prior to fiber post cementation with self-adhesive resin cements that do not require smear layer removal, this study aims to clarify whether different irrigation solutions influence bond strength. This study used the push-out test to evaluate the bond strength of fiber posts luted with self-adhesive resin cement to root canal dentin under different disinfection techniques. Different disinfectant solutions or medications are indicated prior fiber post bonding procedures.The aim was to evaluate the effect of different pretreatments of root canal on the bond strength of a fiber post luted to dentin with self-adhesive resin cement. Conclusions: Irrigation with 17% EDTA associated with 5% NaOCl showed increased bond strength compared with the same solutions used alone
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