Influence of sodium hypochlorite and edta on the microtensile bond strength of a self-etching adhesive system
J. appl. oral sci
;
18(4): 385-389, July-Aug. 2010. ilus, tab
Artículo
en Inglés
| LILACS
| ID: lil-557109
ABSTRACT
Chemical substances used during biomechanical preparation of root canals can alter the composition of dentin surface and affect the interaction with restorative materials. OBJECTIVE:
The purpose of this study was to evaluate the microtensile bond strength (µTBS) of a self-etching adhesive system to dentin irrigated with sodium hypochlorite (NaOCl) and ethylenediaminetetraacetic acid (EDTA). MATERIAL ANDMETHODS:
Thirty human third molars were sectioned 3 mm below the occlusal surface, polished with 600- to 1200-grit silicon carbide papers, and randomly divided into 3 groups G1 (control) no irrigating solution; G2 1 percent NaOCl; and G3 1 percent NaOCl followed by the application of 17 percent EDTA. The specimens received the self-etching adhesive system (XENO III - Dentsply), restored with microhybrid composite resin (Z250 - 3M ESPE), sectioned and trimmed to create 4 hourglass-shaped slabs of each tooth. The slabs were tested in microtensile strength in a universal testing machine (Emic DL 2000) at a crosshead speed of 0.5 mm/min until fracture. The results were analyzed statistically by ANOVA and Newman-Keuls test.RESULTS:
Mean µTBS values and standard deviations in MPa were G1 = 11.89 ± 4.22; G2 = 19.41 ± 5.32; G3 = 11.34 ± 4.73. 1 percent NaOCl increased the adhesive resistance significantly (p<0.001/F=22.5763). The application of 1 percent NaOCl/17 percent EDTA resulted in statistically similar µTBS to the control group.CONCLUSIONS:
None of the irrigants affected negatively the µTBS of XENO III to dentin. The use of 1 percent NaOCl alone resulted in higher bond strength than the other treatments. The combination of 1 percent NaOCl and 17 percent EDTA produced similar bond strength to that of untreated dentin.
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Irrigantes del Conducto Radicular
/
Hipoclorito de Sodio
/
Quelantes
/
Recubrimiento Dental Adhesivo
/
Ácido Edético
/
Recubrimientos Dentinarios
Tipo de estudio:
Ensayo Clínico Controlado
Límite:
Humanos
Idioma:
Inglés
Revista:
J. appl. oral sci
Asunto de la revista:
Odontología
Año:
2010
Tipo del documento:
Artículo
País de afiliación:
Brasil
Institución/País de afiliación:
Ribeirão Preto Dental School University of São Paulo/BR
/
State University of Campinas/BR
/
University of Passo Fundo/BR
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