COMPARACIÓN DE LA FUERZA ADHESIVA Y EL TIPO DE FALLA DE DOS SISTEMAS ADHESIVOS PARA ORTODONCIA

Objective: To compare the bond strength and failure mode between total and self-etching systems used for brackets cementation.Methods: Twenty human first premolars were randomly divided into two groups: 10 for the total etching system (Transbond™ XT, 3M Unitek, St. Paul, Minnesota, USA) and 10 for the self-etching system (Transbond™ Plus Self Etching Primer + Transbond™ XT, 3M Unitek, St. Paul, Minnesota, USA). Standard brackets (Ortho Organizers, California, USA) were cemented, and after 24 hours submitted to 5000 thermal cycles. Subsequently, shear bond strength tests were performed applying force at the bracket/enamel interphase using an universal testing machine (Instron®) at 1.5 mm/min crosshead speed. Finally, enamel surfaces and bracket bases were observed using a stereomicroscope (Stemi 2000C, Carl Zeiss, Göttingen, Germany).Results: The results, in terms of bond strength, showed a statistical significant difference (p<0.05) between the two adhesive systems, presenting higher values the total-etching system (28,98MPa vs. 18,67MPa). The predominant failure modes presented for both systems were at the adhesive-enamel interphase (80% and 70%).Conclusion: Bond strength and failure mode are influenced by the dental substrate pre-treatment and the chemical composition of the adhesive. Therefore, the in-vitro bond strength obtained when a self-etching system is used in orthodontics, produce enough micromechanical retention with lower risk of damage to the dental tissue.

• Autores: Ciceri, Ana Lucía; Monroy Parada, John Jairo; Ardila Duarte, Gerardo; Luna Salguero, Antonio; Rivera Barrero, Jaime Rodrigo
• Fecha de publicación: 2011
• Institución: Universidad Santo Tomás
• Repositorio: Repositorio Institucional USTA
• Idioma: spa
• OAI Identifier: oai:repository.usta.edu.co:11634/37022
• Acceso en línea: http://revistas.ustabuca.edu.co/index.php/USTASALUD_ODONTOLOGIA/article/view/1147; http://hdl.handle.net/11634/37022
• License: Derechos de autor 2018 UstaSalud