RESUMEN
Purpose: This in vitro study aimed to evaluate the influence of the manual manipulation of two composite resins: Filtek™ Z350XT (3M ESPE) and Herculite Précis® (Kerr), with latex gloves contaminated with powder, human saliva and alcohol, on the microhardness values. Material and Methods: Manual manipulation was evaluated using latex gloves with powder, latex gloves without powder, latex gloves without powder with saliva, latex gloves without powder with alcohol, and without hand manipulation or contaminants (control). Each resin was manually manipulated for 10 seconds and photoactivated for 20 seconds with a light intensity of 1000mW/cm2 using a VALO Ultradent LED light cured unit, and then each sample was evaluated on the microhardness Vickers tester Leitz (Wetzlar). The collected data were analyzed using Kruskal Wallis and Mann Whitney post-test (p<0.05). Results. Microhardness values showed a significant difference between the evaluated and control groups, showing lower microhardness values in the group of latex glove with powder for Filtek™ Z350XT and the group of latex glove without powder with saliva for Herculite Précis®. Conclusion. The manual manipulation of composite resins decreases their surface microhardness.
Propósito: Este estudio in vitrotuvo como objetivo evaluar la influencia de la manipulación manual de dos resinas compuestas: Filtek ™ Z350XT (3M ESPE) y Herculite Précis® (Kerr), con guantes de látex contaminados con polvo, saliva humana y alcohol, sobre los valores de microdureza. Material y Métodos: La manipulación manual se evaluó utilizando guantes de látex con polvo, guantes de látex sin polvo, guantes de látex sin polvo con saliva, guantes de látex sin polvo con alcohol, y sin manipulación manual o contaminantes (control). Cada resina fue manipulada manualmente durante 10 segundos y fotoactivada durante 20 segundos con unaintensidad de luz de 1000mW/cm2 usando una unidad de fotocuración LED VALO - Ultradent, y luego cada muestra fue evaluada en el tester de microdureza Vickers Leitz (Wetzlar). Los datos recopilados se analizaron utilizando Kruska Wallis y post-test Mann Whitney (p<0.05). Resultados: Se observó una diferencia significativa en los valores de microdureza entre los grupos evaluados y el grupo control, con valores más bajos de microdureza en el grupo de guantes de látex con polvo para Filtek™ Z350XT y el grupo de guantes de látex sin polvo con saliva para Herculite Précis®. Conclusión. La manipulación manual de resinas compuestas disminuye su microdureza superficial.
Asunto(s)
Humanos , Resinas Compuestas , Materiales Dentales/efectos adversos , Guantes Quirúrgicos , Pruebas de Dureza , Permeabilidad , Técnicas In Vitro , Contaminantes Físicos/efectos adversos , Contaminantes Ambientales/efectos adversos , Látex/químicaRESUMEN
INTRODUCTION: Luting posts inside the root canal is still a challenge because of the difficulty of bonding adhesive materials in the apical third of roots. This study evaluated the effect of the application mode of 3 simplified etch-and-rinse adhesives on the push-out bond strength (PBS), nanoleakage (NL), and in situ degree of conversion (DC) of fiber posts in the root canal. METHODS: The roots of human premolars were endodontically prepared and divided into 6 groups according to the combination of the main factors: adhesive (Ambar, FGM, Joinville, SC, Brazil; Adper Single Bond 2, 3MESPE, St Paul, MN; and XP Bond+self-cure activator, DeTrey Dentsply, Konstanz, Germany) and application mode (manual or sonic). The posts were cemented and the PBS tested at 0.5 mm/min. The NL was evaluated by scanning electron microscopy after the immersion of specimens in 50% silver nitrate. Micro-Raman spectroscopy was used to measure the in situ DC. Root third was also considered in the statistical evaluation. Data were analyzed by 3-way repeated measures analysis of variance and Tukey tests (5%). RESULTS: Under sonic application, the PBS and the in situ DC increased, whereas NL decreased significantly for all groups in the middle and apical thirds (P < .05). CONCLUSIONS: The application of simplified adhesives by sonic mode in the root canal is a feasible tool to increase the fiber post bond to root canals.