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Effect of thermocycling on bond strength of fiber posts
e34
d e n t a l m a t e r i a l s 2 5 ( 2 0 0 9 ) e5–e46
and 2 were stored in 37 ◦ C water during 24 h before shear bond test and group 3 was placed in a thermal cycling machine3 during 5000 water baths cycles from 5 to 55 ◦ C, then the shear bond strength was measured.4 The results were analyzed with two-way ANOVA and Tukey’s comparison (p < 0.05) Results: The results of shear bond strength are illustrated in Figure. Shear bond strength of groups NO UV-NO ThC, and UVThC were statistically significant different from that of group UV-NO ThC. However, differences between the resins types were not significant.
Material
CoreXFlow 2 XPBond adhesive/selfcuring activator RelyX Unicem Panavia F 2.0/ED primer
Control
Thermocycling (×40000 cycles)
7.8 ± 2.1 MPaa
6.4 ± 2.3 MPaa,b
8.3 ± 2.6 MPaa 7.3 ± 1.3 MPaa,b
5.8 ± 2.2 MPab 4.3 ± 1.8 MPac
†Values are mean ± standard deviation. Groups with the same superscripts are not statistically significant (p > 0.05).
Conclusions: The bonding of acrylic resin and experimental composite resin teeth and unfilled resin after UV irradiation did not change after thermocycling. doi:10.1016/j.dental.2009.01.064 Effect of thermocycling on bond strength of fiber posts A. Mazzoni 1,∗ , G. Marchesi 2 , E. Visintini 2 , M. Cadenaro 2 , R. Di Lenarda 2 , M. Ferrari 3 , L. Breschi 2 1
University of Bologna, Italy University of Trieste, Italy 3 University of Siena, Italy
Irrespective from the luting approach, the nanoleakage analysis revealed increased silver depositions after thermocycling. Conclusions: The hypothesis tested was rejected since differences in the mechanical stability after thermocycling were found among the different strategies to lute fiber posts. The use of the etch-and-rinse adhesive strategy in combination with the resin based cement recommended by the manufacturer showed the lowest susceptibility to long-term thermocycling, conversely, a self-etch approach (either with the adhesive or using the self-adhesive cement) resulted in reduced push out bond strength after aging, although the selfadhesive cement performed better. Additional clinical trials are needed to validate these in vitro data as well as the effect of thermocycling to properly simulate intraoral condition.
2
Objectives: To examine the effect of thermocycling on the retention of fiber posts cemented to intraradicular dentin using different luting agent. The interfacial strength and ultrastructure of an etch-and-rinse adhesive with the resin based cement recommended by the manufacturer, a self-etch resin cement and a self-adhesive cement were assessed with push out test and interfacial nanoleakage analysis. The hypothesis tested was that thermocycling equally affects the different bonding strategies. Materials and methods: Fiber posts were luted to endodontically treated single canal teeth using: (1) CoreXFlow 2/XPBond adhesive/self-curing activator with DT Light Fiber Post (Dentsply); (2) Panavia F 2.0/ED primer (Kuraray) with Tech 2000 fiber post (Isasan) or 3) RelyX Unicem with RelyX Fiber Post (3 M ESPE). Bonded specimens were sectioned into 1 mm thick slabs and either submitted to thermocycling (40,000 cycles from 5 ◦ C to 55 ◦ C in artificial saliva, alternatively 30 s for each bath) or stored in artificial saliva prior to push-out bond strength testing. For each group additional specimens were processed for interfacial nanoleakage analysis. Statistical analysis was performed with two-way ANOVA (p < 0.05). Results: Push-out bond strength values are listed below:
doi:10.1016/j.dental.2009.01.065 Effects of different adhesive systems on the bonding durability between dentin and fiber posts R.M. Melo 1,∗ , M.A. Bottino 1 , W. Soboyejo 2 1 2
São Paulo State University, Brazil Princeton University, USA
Objectives: This study evaluated the performance of two etch-and-rinse (All bond 21 and One Step Plus (see footnote 1)) and two self-etch adhesive systems (Clearfil SE Bond2 and XenoIII3 ) concerning their bonding durability to coronal and root canal dentin and influence on the degree of cure of a dual-cure cement. Materials and methods: The root canals of 80 human incisors and canines were instrumented and prepared with burs. Dentin was treated with one of the four adhesives and FRC Postec posts (Ivoclar4 ) were cemented to the root canal with dual-cure resin cement (Duo-link-Bisco). Eight groups were formed according to the adhesive system employed and the aging time in water (7 d or 120 d). Six transverse sections (∼1.0 mm) were cut from 4 mm above the CEJ up to 4 mm
1 2 3 4
K 178, Tokyo Giken. MMT-250N, Shimadzu.
3 4
Bisco. Kuraray. Dentsply. Ivoclar.
d e n t a l m a t e r i a l s 2 5 ( 2 0 0 9 ) e5–e46
and 2 were stored in 37 ◦ C water during 24 h before shear bond test and group 3 was placed in a thermal cycling machine3 during 5000 water baths cycles from 5 to 55 ◦ C, then the shear bond strength was measured.4 The results were analyzed with two-way ANOVA and Tukey’s comparison (p < 0.05) Results: The results of shear bond strength are illustrated in Figure. Shear bond strength of groups NO UV-NO ThC, and UVThC were statistically significant different from that of group UV-NO ThC. However, differences between the resins types were not significant.
Material
CoreXFlow 2 XPBond adhesive/selfcuring activator RelyX Unicem Panavia F 2.0/ED primer
Control
Thermocycling (×40000 cycles)
7.8 ± 2.1 MPaa
6.4 ± 2.3 MPaa,b
8.3 ± 2.6 MPaa 7.3 ± 1.3 MPaa,b
5.8 ± 2.2 MPab 4.3 ± 1.8 MPac
†Values are mean ± standard deviation. Groups with the same superscripts are not statistically significant (p > 0.05).
Conclusions: The bonding of acrylic resin and experimental composite resin teeth and unfilled resin after UV irradiation did not change after thermocycling. doi:10.1016/j.dental.2009.01.064 Effect of thermocycling on bond strength of fiber posts A. Mazzoni 1,∗ , G. Marchesi 2 , E. Visintini 2 , M. Cadenaro 2 , R. Di Lenarda 2 , M. Ferrari 3 , L. Breschi 2 1
University of Bologna, Italy University of Trieste, Italy 3 University of Siena, Italy
Irrespective from the luting approach, the nanoleakage analysis revealed increased silver depositions after thermocycling. Conclusions: The hypothesis tested was rejected since differences in the mechanical stability after thermocycling were found among the different strategies to lute fiber posts. The use of the etch-and-rinse adhesive strategy in combination with the resin based cement recommended by the manufacturer showed the lowest susceptibility to long-term thermocycling, conversely, a self-etch approach (either with the adhesive or using the self-adhesive cement) resulted in reduced push out bond strength after aging, although the selfadhesive cement performed better. Additional clinical trials are needed to validate these in vitro data as well as the effect of thermocycling to properly simulate intraoral condition.
2
Objectives: To examine the effect of thermocycling on the retention of fiber posts cemented to intraradicular dentin using different luting agent. The interfacial strength and ultrastructure of an etch-and-rinse adhesive with the resin based cement recommended by the manufacturer, a self-etch resin cement and a self-adhesive cement were assessed with push out test and interfacial nanoleakage analysis. The hypothesis tested was that thermocycling equally affects the different bonding strategies. Materials and methods: Fiber posts were luted to endodontically treated single canal teeth using: (1) CoreXFlow 2/XPBond adhesive/self-curing activator with DT Light Fiber Post (Dentsply); (2) Panavia F 2.0/ED primer (Kuraray) with Tech 2000 fiber post (Isasan) or 3) RelyX Unicem with RelyX Fiber Post (3 M ESPE). Bonded specimens were sectioned into 1 mm thick slabs and either submitted to thermocycling (40,000 cycles from 5 ◦ C to 55 ◦ C in artificial saliva, alternatively 30 s for each bath) or stored in artificial saliva prior to push-out bond strength testing. For each group additional specimens were processed for interfacial nanoleakage analysis. Statistical analysis was performed with two-way ANOVA (p < 0.05). Results: Push-out bond strength values are listed below:
doi:10.1016/j.dental.2009.01.065 Effects of different adhesive systems on the bonding durability between dentin and fiber posts R.M. Melo 1,∗ , M.A. Bottino 1 , W. Soboyejo 2 1 2
São Paulo State University, Brazil Princeton University, USA
Objectives: This study evaluated the performance of two etch-and-rinse (All bond 21 and One Step Plus (see footnote 1)) and two self-etch adhesive systems (Clearfil SE Bond2 and XenoIII3 ) concerning their bonding durability to coronal and root canal dentin and influence on the degree of cure of a dual-cure cement. Materials and methods: The root canals of 80 human incisors and canines were instrumented and prepared with burs. Dentin was treated with one of the four adhesives and FRC Postec posts (Ivoclar4 ) were cemented to the root canal with dual-cure resin cement (Duo-link-Bisco). Eight groups were formed according to the adhesive system employed and the aging time in water (7 d or 120 d). Six transverse sections (∼1.0 mm) were cut from 4 mm above the CEJ up to 4 mm
1 2 3 4
K 178, Tokyo Giken. MMT-250N, Shimadzu.
3 4
Bisco. Kuraray. Dentsply. Ivoclar.