Influence of method and period of storage on the microtensile bond strength of indirect composite resin restorations to dentine
Braz. oral res
;
22(4): 352-357, 2008. ilus, tab
Artículo
en Inglés
| LILACS
| ID: lil-502190
ABSTRACT
This study evaluated the influence of the method and period of storage on the adhesive bond strength of indirect composite resin to bovine dentin. Ninety bovine incisors were stored in three different solutions 0.2 percent thymol, 10 percent formalin, and 0.2 percent sodium azide, during 3 periods of storage 7 days, 30 days and 6 months, resulting in 9 groups (n = 10). The roots were cut off and the buccal surface was ground with #600-grit silicon carbide paper. The surface was conditioned with 37 percent phosphoric acid for 15 s and a composite resin restoration (TPH Spectrum) was fixed using a one-bottle adhesive system (Adper Single Bond) and a dual-cured resinous cement (Rely X ARC) under a load of 500 g for 5 minutes. The samples were serially cut perpendicular to the bonded interface to obtain slices of 1.2 mm in thickness. Each slab was trimmed with a cylindrical diamond bur resulting in an hourglass shape with a cross-sectional area of approximately 1 mm². The microtensile bond strength (μTBS) testing was performed in a testing machine (EMIC 2000 DL) at a 0.5 mm/minute crosshead-speed until failure. After fracture, the specimens were examined under SEM to analyze the mode of fracture. μTBS Means were expressed in MPa and the data were analyzed by two-way ANOVA (3X3) and the Tukey test (α = 0.05). The storage times of 7 and 30 days produced no significant difference irrespective of the solution type. The formalin and thymol solutions, however, did have a negative influence on bond strength when the teeth were stored for 6 months.
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Recubrimiento Dental Adhesivo
/
Recubrimientos Dentinarios
/
Resinas Compuestas
/
Restauración Dental Permanente
/
Dentina
/
Antiinfecciosos
Límite:
Animales
Idioma:
Inglés
Revista:
Braz. oral res
Asunto de la revista:
Odontología
Año:
2008
Tipo del documento:
Artículo
/
Documento de proyecto
País de afiliación:
Brasil
Institución/País de afiliación:
Federal University of Uberlândia/BR
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