Effects of different irrigating solutions and disinfection methods on push-out bond strengths of fiber posts.
OBJECTIVE
The aim of this study was to evaluate the effects of various irrigating solutions and photoactivated disinfection (PAD) on the push-out bond strengths of fiber posts to root dentin.


METHODS
Thirty-two human teeth were divided into eight groups, as follows: (1) irrigation with physiologic saline (control), (2) NaOCl irrigation, (3) chlorhexidine (CHX) irrigation, (4) ethanol (EtOH) irrigation, (5) NaOCl followed by 17% EDTA irrigation, (6) NaOCl-EDTA supplemented with CHX irrigation, (7) NaOCl-EDTA supplemented with EtOH irrigation and (8) NaOCl-EDTA irrigation supplemented with PAD. After the posts were cemented, the roots were transversally sectioned to obtain four slices (1 mm thick) (n = 16). Push-out tests were conducted by applying a load at 0.5 mm/min, types of fracture failures were recorded and data were analyzed with one-way ANOVA and Tukey post-hoc tests (p = 0.05).


RESULTS
Push-out bond strength was significantly affected by the type of irrigating solution and the disinfection protocol (p < 0.05). The bond strength of the EtOH, NaOCl and NaOCl-EDTA-CHX irrigated groups was significantly higher than that of the other groups. The highest bond strength was observed in the EtOH irrigated group and the lowest was the NaOCl-EDTA irrigated group.


CONCLUSIONS
Irrigation with NaOCl and EDTA combined caused lower bond strength than observed in the control group. However, supplementing this combination with CHX improved the post-dentin bond strengths; supplementing with PAD did not.
Department of Endodontics, Faculty of Dentistry, Izmir Katip Celebi University , Izmir , Turkey.
Huseyin
H
Ertas
Evren
E
Ok
Banu
B
Uysal
Hakan
H
Arslan
D002484:Cementation / Q000379:methods; D002710:Chlorhexidine / Q000737:chemistry; D001840:Dental Bonding; D003786:Dental Pulp Cavity / Q000648:ultrastructure; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure; D004203:Disinfection / Q000379:methods*; D004492:Edetic Acid / Q000737:chemistry; D000431:Ethanol / Q000737:chemistry; D006801:Humans; D006813:Humidity; D008422:Materials Testing; D010778:Photochemotherapy / Q000379:methods; D011176:Post and Core Technique / Q000295:instrumentation*; D012388:Root Canal Irrigants / Q000737:chemistry*; D018915:Root Canal Preparation / Q000379:methods*; D012973:Sodium Hypochlorite / Q000737:chemistry; D007507:Therapeutic Irrigation / Q000379:methods; D013997:Time Factors
D012388:Root Canal Irrigants; D000431:Ethanol; D004492:Edetic Acid; D012973:Sodium Hypochlorite; D002710:Chlorhexidine
bond strength; chlorhexidine; ethanol; fiber post; photoactivation