In-vitro evaluation of bond strength of four self-etching cements.

Indirect restorations need to be attached with adhesive luting agents to prevent them from becoming dislodged and provide adequate marginal sealing. The aim of this study was to evaluate bond strength to dentin of self-etching resin cements. MATERIALS AND METHODS: 75 flat dentin surfaces were randomly distributed among 5 groups, according to cements used; Group 1: RelyxU100 (3M/ESPE), Group 2: Bis Cem (Bisco), Group 3: Max Cem (Kerr), Group 4: SeT PP (SDI) and Group 5: Relyx ARC (3M/ESPE), control. Ceramic test cylinders (IPS Empress 2 / Ivoclar-Vivadent) 4.1 mm across were prepared and attached to the dentin surfaces using the different cements. A constant 25N load was applied for 1 minute and they were light-polymerized. Following storage for 24 hours at 100% humidity and 37 °C, the specimens were tested for bond strength under shear strain in an Instron testing machine at a crosshead speed of 1 mm/minute; at 7, 14 and 21 days. Data were analyzed by ANOVA and Tukey's test. There were significant differences between materials (p < 0.0001), but not between times or material/time interaction. RelyXARC (Control Group) had the highest bond strength (15.52 MPa). Among the self-etching cements, the best behavior was found for Relyx U100 (10.80MPa), followed by BisCem (6.36 MPa), MaxCem (5.45 MPa) and SeTPP (3.17 MPa). The bond strength of the self-adhesive cements evaluated was lower than that for resin cements which require previous treatment of the dental substrate (control group). This should be taken into account during clinical selection, in particular for tooth preparations with poor retention.

Las restauraciones indirectas deben ser fijadas por medio de agentes cementantes, para evitar su desprendimiento y mantener un adecuado sellado marginal. El objetivo de este trabajo fue evaluar la resistencia adhesiva a dentina de los cementos resinosos de autograbado. Materiales y métodos: Se utilizaron 75 superficies planas de dentina, distribuidos aleatoriamente en 5 grupos, según los medios cementantes; GRUPO 1: RelyxU100 (3M/ESPE), GRUPO 2: Bis Cem (Bisco), GRUPO 3: Max Cem (Kerr), GRUPO 4: SeT PP (SDI) y GRUPO 5: Relyx ARC (3M/ESPE), control. Se confeccionaros probetas cilindricas de cerámica (IPS Empress 2 / Ivoclar-Vivadent) de 4,1 mm de diámetro, las que fueron fijadas a las superficies de dentina mediante los distintos cementos. Se aplicó una carga constante de 25N durante 1 minuto y se realizó la fotopolimerización. Después de 24 horas de almacenamiento en un medio con 100 % de humedad a 37° C, las probetas fueron sometidas a ensayo de resistencia adhesiva bajo tensiones de corte en máquina Instron, con una velocidad del cabezal de 1 mm/minuto; a los 7, 14 y 21 dias. Los datos fueron analizados mediante ANOVA y test de Tukey, mostrando diferencias significativas entre los materiales (p < 0,0001), no asi respecto al factor tiempo ni a su interacción. El mayor valor de resistencia adhesiva lo presentó RelyX ARC (Grupo control) (15,52MPa), De los cementos autograbantes, el mejor comportamiento se obtuvo en Relyx U100 (10,80MPa), seguido por BisCem (6,36MPa), MaxCem (5,45MPa) y SeTPP (3,17MPa): Los cementos autoadhesivos evaluados presentaron menor resistencia adhesiva que los cementos resinosos que requieren tratamiento previo del sustrato dentario (grupo control). Esto deberia ser considerado cuando se realiza su selección clinica, sobre todo en preparaciones dentarias poco retentivas.

In vitro evaluation of bond strength of four self-etching cements

Indirect restorations need to be attached with adhesive luting agents to prevent them from becoming dislodged and provide adequate marginal sealing. The aim of this study was to evaluate bond strength to dentin of selfetching resin cements. Materials and methods: 75 flat dentin surfaces were randomly distributed among 5 groups, according to cements used; Group 1: RelyxU100 (3M/ESPE), Group 2: Bis Cem (Bisco), Group 3: Max Cem (Kerr), Group 4: SeT PP (SDI) and Group 5: Relyx ARC (3M/ESPE), control. Ceramic test cylinders (IPS Empress 2 / IvoclarVivadent) 4.1 mm across were prepared and attached to the dentin surfaces using the different cements. A constant 25N load was applied for 1 minute and they were lightpolymerized. Following storage for 24 hours at 100% humidity and 37 °C, the specimens were tested for bond strength under shear strain in an Instron testing machine at a crosshead speed of 1 mm/minute; at 7, 14 and 21 days. Data were analyzed by ANOVA and Tukey's test. There were significant differences between materials (p < 0.0001), but not between times or material/time interaction. RelyX ARC (Control Group) had the highest bond strength (15.52 MPa). Among the selfetching cements, the best behavior was found for Relyx U100 (10.80MPa), followed by BisCem (6.36 MPa), MaxCem (5.45 MPa) and SeTPP (3.17 MPa). The bond strength of the selfadhesive cements evaluated was lower than that for resin cements which require previous treatment of the dental substrate (control group). This should be taken into account during clinical selection, in particular for tooth preparations with poor retention (AU)

Las restauraciones indirectas deben ser fijadas por medio de agentes cementantes, para evitar su desprendimiento y mantener un adecuado sellado marginal. El objetivo de este trabajo fue evaluar la resistencia adhesiva a dentina de los cementos resinosos de autograbado. Materiales y métodos: Se utilizaron 75 superficies planas de dentina, distribuidos aleatoriamente en 5 grupos, según los medios cementantes; GRUPO 1: RelyxU100 (3M/ESPE), GRUPO 2: Bis Cem (Bisco), GRUPO 3: Max Cem (Kerr), GRUPO 4: SeT PP (SDI) y GRUPO 5: Relyx ARC (3M/ESPE), control. Se confeccionaros probetas cilíndricas de cerámica (IPS Empress 2 / IvoclarVivadent) de 4,1 mm de diámetro, las que fueron fijadas a las superficies de dentina mediante los distintos cementos. Se aplicó una carga constante de 25N durante 1 minuto y se realizó la fotopolimerización. Después de 24 horas de almacenamiento en un medio con 100 % de humedad a 37° C, las probetas fueron sometidas a ensayo de resistencia adhesiva bajo tensiones de corte en máquina Instron, con una velocidad del cabezal de 1 mm/minuto; a los 7, 14 y 21 días. Los datos fueron analizados mediante ANOVA y test de Tukey, mostrando diferencias significativas entre los materiales (p < 0,0001), no así respecto al factor tiempo ni a su interacción. El mayor valor de resistencia adhesiva lo presentó RelyX ARC (Grupo control) (15,52MPa), De los cementos autograbantes, el mejor compor ta miento se obtuvo en Relyx U100 (10,80MPa), seguido por BisCem (6,36MPa), MaxCem (5,45MPa) y SeTPP (3,17MPa): Los cementos autoadhesivos evaluados presentaron menor resistencia adhesiva que los cementos resinosos que requieren tratamiento previo del sustrato dentario (grupo control). Esto debería ser considerado cuando se realiza su selección clínica, sobre todo en preparaciones dentarias poco retentivas (AU)

In vitro evaluation of the film thickness of self-etching resin cements.

The aim of this study was to evaluate the film thickness of selfetching resin cement. The following materials were used: Group1, Relyx U100 (3M /ESPE); Group 2, BisCem (Bisco); Group 3, Max Cem (Kerr); Group 4, Set (SDI) and Group 5, Relyx ARC (3M/ESPE) as control. Two 5.4 x 76.2 x 1 mm glass slides were marked in the center to identify the area where the material would be placed. A volume of 0.05 ml was used for each specimen material. After 1, 3 and 6 minutes, a 50 N load was applied for one minute. The thickness of each specimen was then measured using a digital micrometer to the nearest 1 µm; (Digimatic, Mitutoyo Corporation, Japan.). Data were analyzed using ANOVA and Bonferroni's multiple comparison tests. No significant difference was found between the materials tested (p = 0.0921) or material/time interaction (p = 0.0864), but there were differences in the time factor (p = 0.0001). At one minute, the thinnest film was Relyx ARC (control) (14 µm), followed by Relyx U100 (17 µm), and Maxcem and SeT (19 µm). At 3 minutes, Group 5 (control) was also the thinnest film (19 µm), followed by Group 1 (21 µm), Group 3 (25 µm), Group 2 (29 µm), and Group 4 (31 µm). At 6 minutes, Group 4 was the thinnest (34 µm), followed by Group 1 (38 µm), Group 5 (40 µm), Group 2 (41 µm) and Group 3 (42 µm). The film thickness of resin cements was influenced by time and polymerization reaction. The film thickness of self-etching cements was low.

In vitro evaluation of the film thickness of self-etching resin cements

El objetivo fue evaluar el espesor de película de cementos resinosos de autograbado. Se utilizaron los siguientes materiales Grupo 1: Relyx U100 (3M /ESPE), Grupo 2 BisCem(Bisco), Grupo 3: Max Cem (Kerr), Grupo 4: Set (SDI) y Grupo 5: Relyx ARC (3M/ESPE) como control. Se emplearon dos superficies de vidrio de 25.4 x 76.2 x 1 mm., señaladas en suparte media con una marca, para ubicar el material sobre la misma área. Se utilizó un volumen de 0,05 ml. de material para cada probeta. Se esperó 1, 3 o 6 minutos para aplicar unacarga de 50 N durante 1 minuto. Trascurrido dicho lapso cada probeta se sometió a lectura de espesor de película utilizando un micrómetro digital, con una precisión de 1um; (Digimatic, Mitutoyo Corporation, Japón.). Los datos fueron analizados mediante ANOVA y test de comparaciones múltiples de Bonferroni,no hubo diferencias significativas entre los materiales evaluados (p = 0,0921), ni en la interacción material / tiempo(p = 0,0864), pero si existieron diferencias en relación al factor tiempo (p = 0,0001). Al minuto el menor espesor de película correspondió a Relyx ARC (control) con un valor de 14 μm, seguido por Relyx U100 (17 μm), BisCem, Maxcem y SeT presentaronun valor de 19 μm. A los 3 minutos el grupo 5 (control) presentó también el menor espesor (19 μm), seguido por elgrupo 1 (21 μm), grupo 3 (25 μm), grupo 2 (29 μm), y grupo 4 (31 um). A los 6 minutos el grupo 4 mostró el menor valor con 34 μm, seguido por grupo 1 (38 μm), grupo 5 (40 μm), grupo 2 (41 μm) y grupo 3 (42 μm). El espesor de película de los cementosresinosos se vió influenciado por el tiempo y reacción de polimerización. Los cementos de autograbado presentaron un reducido espesor de película

In vitro evaluation of the film thickness of self-etching resin cements. / In vitro evaluation of the film thickness of self-etching resin cements.

The aim of this study was to evaluate the film thickness of selfetching resin cement. The following materials were used: Group1, Relyx U100 (3M /ESPE); Group 2, BisCem (Bisco); Group 3, Max Cem (Kerr); Group 4, Set (SDI) and Group 5, Relyx ARC (3M/ESPE) as control. Two 5.4 x 76.2 x 1 mm glass slides were marked in the center to identify the area where the material would be placed. A volume of 0.05 ml was used for each specimen material. After 1, 3 and 6 minutes, a 50 N load was applied for one minute. The thickness of each specimen was then measured using a digital micrometer to the nearest 1 Am; (Digimatic, Mitutoyo Corporation, Japan.). Data were analyzed using ANOVA and Bonferronis multiple comparison tests. No significant difference was found between the materials tested (p = 0.0921) or material/time interaction (p = 0.0864), but there were differences in the time factor (p = 0.0001). At one minute, the thinnest film was Relyx ARC (control) (14 Am), followed by Relyx U100 (17 Am), and Maxcem and SeT (19 Am). At 3 minutes, Group 5 (control) was also the thinnest film (19 Am), followed by Group 1 (21 Am), Group 3 (25 Am), Group 2 (29 Am), and Group 4 (31 Am). At 6 minutes, Group 4 was the thinnest (34 Am), followed by Group 1 (38 Am), Group 5 (40 Am), Group 2 (41 Am) and Group 3 (42 Am). The film thickness of resin cements was influenced by time and polymerization reaction. The film thickness of self-etching cements was low.