Effect of ultrasonic instrumentation on the bond strength of crowns cemented with zinc phosphate cement to natural teeth: an in vitro study
Braz. oral res
;
22(3): 270-274, 2008. tab
Artículo
en Inglés
| LILACS
| ID: lil-495604
ABSTRACT
Several studies have reported the benefits of sonic and/or ultrasonic instrumentation for root debridement, with most of them focusing on changes in periodontal clinical parameters. The present study investigated possible alterations in the tensile bond strength of crowns cemented with zinc phosphate cement to natural teeth after ultrasonic instrumentation. Forty recently extracted intact human third molars were selected, cleaned and stored in physiologic serum at 4°C. They received standard preparations, at a 16º convergence angle, and AgPd alloy crowns. The crowns were cemented with zinc phosphate cement and then divided into four groups of 10 teeth each. Each group was then subdivided into two subgroups, with one of the subgroups being submitted to 5,000 thermal cycles ranging from 55 ± 2 to 5 ± 2°C, while the other was not. Each group was submitted to ultrasonic instrumentation for different periods of time group 1 - 0 min (control), group 2 - 5 min, group 3 - 10 min, and group 4 - 15 min. Tensile bond strength tests were performed with an Instron testing machine (model 4310). Statistical analysis was performed using ANOVA and Tukey's test at the 5 percent level of significance. A significant reduction in the tensile bond strength of crowns cemented with zinc phosphate and submitted to thermal cycles was observed at 15 min (196.75 N versus 0 min = 452.01 N, 5 min = 444.23 N and 10 min = 470.85 N). Thermal cycling and ultrasonic instrumentation for 15 min caused a significant reduction in tensile bond strength (p < .05).
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Tratamiento del Conducto Radicular
/
Terapia por Ultrasonido
/
Cemento de Fosfato de Zinc
/
Cementación
/
Corona del Diente
Tipo de estudio:
Estudio pronóstico
Límite:
Humanos
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:
São Paulo State University/BR
/
University of São Paulo/BR
/
Vale do Paraíba University/BR
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