Effect of different surface treatments on the push-out bond strength of fiber post to root canal dentin.
OBJECTIVE
The purpose of this study was to evaluate the effects of different surface treatments on the bond strength of a fiber post to dentin.


METHODS
Sixty extracted human maxillary incisor teeth were manually shaped with K-files using the step-back technique. ISO size 45 files were used as master apical files. Post spaces were prepared and then the root canals were subjected to one of the following 5 surface treatments: irrigation with 5% sodium hypochlorite (NaOCl); treatment with ethanol, ethyl acetate, and acetone-based cleansing agent (Sikko Tim); irrigation with 17% EDTA; etching with 37% orthophosphoric acid for 15 seconds; and etching with 10% citric acid for 15 seconds. Fiber posts were luted using self-etching/self-priming dual polymerized resin cement. From the coronal part of each root, 3 slides of 0.6-mm thickness were obtained. A push-out bond strength test was performed by a universal testing machine at a crosshead speed of 0.5 mm/min. Dentin surfaces were examined under scanning electron microscopy (SEM) after different surface treatments. Data were analyzed with a one-way analysis of variance (ANOVA) and Tukey HSD test.


RESULTS
ANOVA revealed that canal surface treatment affected the bond strength (P < .001). The highest bond strength was obtained in the Sikko Tim group. The results also showed that surface treatment methods increased the bond strength to dentin when compared with the control group.


CONCLUSIONS
Sikko Tim group was the more effective surface treatment agent compared with EDTA, orthophosphoric acid, citric acid, and control groups; however, it could not remove the smear layer and sealer remnants effectively on radicular dentin surfaces. Removal of the smear layer and opening of dentinal tubules are not recommended when a self-etching/self-priming adhesive system is used.
Demiryürek
Ebru Ozsezer
EO
Department of Restorative Dentistry and Endodontics, Faculty of Dentistry, Ondokuz Mayis University, Samsun, Turkey. eozsezer@omu.edu.tr
Külünk
Safak
S
Saraç
Duygu
D
Yüksel
Gözde
G
Bulucu
Bilinç
B
D000134:Acid Etching, Dental / Q000379:methods; D000704:Analysis of Variance; D001840:Dental Bonding; D003786:Dental Pulp Cavity / Q000737:chemistry / Q000187:drug effects; D003799:Dental Stress Analysis; D003804:Dentin / Q000737:chemistry / Q000187:drug effects* / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000737:chemistry* / Q000627:therapeutic use; D006801:Humans; D007180:Incisor; D008437:Maxilla; D011176:Post and Core Technique / Q000295:instrumentation*; D012388:Root Canal Irrigants / Q000737:chemistry / Q000627:therapeutic use; D018915:Root Canal Preparation / Q000295:instrumentation / Q000379:methods*; D016369:Smear Layer; D018709:Statistics, Nonparametric; D013499:Surface Properties
D017220:Dentin-Bonding Agents; D012388:Root Canal Irrigants