Blood contamination effect on shear bond strength of an orthodontic hydrophilic resin
J. appl. oral sci
;
20(1): 89-93, Jan.-Feb. 2012. tab
Artículo
en Inglés
| LILACS
| ID: lil-618159
ABSTRACT
OBJECTIVE:
The aim of this study was to assess the impact of blood contamination on shear bond strength (SBS) and bond failure pattern of metallic brackets bonded using a new hydrophilic resin. MATERIAL ANDMETHODS:
Eighty human premolars were randomly allocated into 4 groups (n=20) according to the bonding material and contamination pattern. GI brackets bonded with the Transbond XT conventional system without contamination; GII brackets bonded with the Transbond XT conventional system with blood contamination; GIII brackets bonded with the Transbond Self Etching Primer and Transbond Plus Color without contamination; GIV brackets bonded with the Transbond Self Etching Primer and Transbond Plus Color with blood contamination. The specimens were stored in distilled water at 37°C for 24 h and then submitted to SBS test at a crosshead speed of 0.5 mm/min. After bond failure, the enamel surfaces were observed under an optical microscope at 40x magnification.RESULTS:
Blood contamination decreased (P<0.05) shear bond strength when both the hydrophobic (GII) and the hydrophilic resin (GIV) were used. However, the bond strength of Transbond Color Change group was significantly higher (P<0.05) than that of the Transbond XT conventional system group under blood contamination condition. Under dry conditions no difference was observed between the hydrophobic and hydrophilic resin groups. Regarding the bond failure pattern, when blood contaminated the enamel, the adhesive remnant index (ARI) showed predominance of scores 0 and 1, which indicates low adhesion to enamel.CONCLUSIONS:
Although there was a significant decrease in the shear bond strength for both adhesive systems under blood contamination, the hydrophilic system showed significantly higher bond strength than the hydrophobic resin adhesive. Therefore, it is advisable to use the hydrophilic resin under risk of blood contamination.
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Sangre
/
Recubrimiento Dental Adhesivo
/
Soportes Ortodóncicos
/
Resinas Compuestas
/
Cementos de Resina
Tipo de estudio:
Ensayo Clínico Controlado
Límite:
Humanos
Idioma:
Inglés
Revista:
J. appl. oral sci
Asunto de la revista:
Odontología
Año:
2012
Tipo del documento:
Artículo
País de afiliación:
Brasil
Institución/País de afiliación:
Pontifical Catholic University of Paraná/BR
/
Pontifical Catholic University of Rio Grande do Sul/BR
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