Effect of bracket bevel design and oral environmental factors on frictional resistance.
Angle Orthod
; 83(6): 956-65, 2013 Nov.
Article
em En
| MEDLINE
| ID: mdl-23621527
ABSTRACT
OBJECTIVE:
To investigate the effects of bracket bevel design and oral environmental factors (saliva, temperature) on frictional resistance. MATERIALS ANDMETHODS:
Five types of brackets, namely a conventional bracket (Omni-arch), an active self-ligating bracket (Clippy), and three passive self-ligating brackets (Carriere, Damon, and Tenbrook T1) coupled with a 0.014-inch austenitic nickel-titanium archwire were tested. In the experimental model, which used a group of five identical brackets, the center bracket was displaced 3 mm to mimic the binding effects. The friction experiments were performed at three temperatures (20°C, 37°C, 55°C) in a dry or a wet (artificial saliva) state. Finally, the surfaces of the bracket slots were observed using scanning electron microscopy (SEM) before and after the friction tests.RESULTS:
The sliding frictional force was significantly influenced by the bracket slot bevel and saliva whether in the active or passive configuration (P < .05). The frictional force significantly increased as the temperature increased in the active configuration (P < .01). Based on the SEM observations, a correlation was found among the level of frictional force, the bevel angle, and the depth of scratches on bracket bevels.CONCLUSION:
Frictional force can be reduced by increasing the bevel angle and by lowering the oral temperature, whereas the presence of saliva increases frictional resistance.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Saliva Artificial
/
Temperatura
/
Braquetes Ortodônticos
/
Desenho de Aparelho Ortodôntico
Tipo de estudo:
Prognostic_studies
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article