Effect of light-curing methods on resin cement knoop hardness at different depths

Sinhoreti, Mário Alexandre Coelho; Manetta, Izabella Paola; Tango, Rubens Nisie; Iriyama, Nelson Tetsu; Correr-Sobrinho, Lourenço

doi:10.1590/s0103-64402007000400006

Cited by 13 publications

(19 citation statements)

References 14 publications

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“…[131819] Generally, impaired adhesion was presented in the studies that dealt with differences in adhesion along the post space. Sinhoreti et al .…”

Section: Discussionmentioning

confidence: 99%

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Microhardness of dual-polymerized resin cement around a translucent fiber post in the intraradicular environment

et al. 2011

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Aim:In this study, we evaluated the effect of photopolymerization on Vickers microhardness of dual-polymerized resin cement at three locations when a translucent quartz fiber post was used.Materials and Methods:Single-rooted bovine teeth received quartz fiber post systems (length: 12 mm) using a dual-polymerized resin cement. In Group 1, the posts were cemented but not photopolymerized, and in Group 2, the posts were both cemented and photopolymerized. After cementation, approximately 1.5-mm thick sections were obtained (two cervical, two middle, and two apical) for regional microhardness evaluations.Statistical Analysis:Statistical analyses were performed using the SPSS software (ver. 11.0 for Windows; SPSS, Inc., Chicago, IL, USA). Microhardness (kg/mm2) data were submitted to two-way analysis of variance (two-way ANOVA) and repeated measures with microhardness values as the dependent variable and polymerization status (two levels: with and without) and root region (three levels: cervical, middle, and apical) as independent variables. Multiple comparisons were made using Dunnett's T3 post-hoc test. P values of <0.05 were considered to indicate statistical significance in all tests.Results:Photopolymerization did not significantly change the microhardness values when compared with no photopolymerization. Microhardness values also showed no significant difference between the three regions in the root canals in both groups.Conclusions:The mode of polymerization of the cement tested in combination with the translucent quartz fiber post system did not affect the microhardness of the cement at the cervical, middle, or apical regions of the root.

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“…[131819] Generally, impaired adhesion was presented in the studies that dealt with differences in adhesion along the post space. Sinhoreti et al .…”

Section: Discussionmentioning

confidence: 99%

“…Sinhoreti et al . [18] observed lower microhardness in deeper regions of the root canal, where less light is delivered. Pedreira et al .,[13] however, reported that microhardness did not vary significantly along the apical thirds of the roots for Panavia and Unicem.…”

Section: Discussionmentioning

confidence: 99%

Microhardness of dual-polymerized resin cement around a translucent fiber post in the intraradicular environment

et al. 2011

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Section: Discussionmentioning

confidence: 99%

“…19,28 Some studies have demonstrated that RelyX ARC reaches a low degree of conversion and hardness in the selfcuring mode within 10 min, in comparison to other dual-cured resin cements, 13,19 but a significant increase in hardness has been observed over time. 19,28 A possible explanation for the low KHN values observed in the present study even 24 h after initial polymerization may be related to storage conditions. Considering that low monomer conversion values are observed within 10 min when RelyX ARC was allowed to self-cure, 10,13 it is possible that the storage of poorly polymerized specimens in humidity resulted in fast water diffusion into the polymer matrix as previously demonstrated in other studies.…”

Section: Discussionmentioning

confidence: 99%

Effect of curing mode on the hardness of dual-cured composite resin core build-up materials

et al. 2010

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This study evaluated the Knoop Hardness (KHN) values of two dual-cured composite resin core build-up materials and one resin cement exposed to different curing conditions. Two dual-cured core buildup composite resins (LuxaCore  -Dual, DMG; and FluoroCore  2, Dentsply Caulk), and one dual-cured resin cement (Rely X ARC, 3M ESPE) were used in the present study. The composite materials were placed into a cylindrical matrix (2 mm in height and 3 mm in diameter), and the specimens thus produced were either light-activated for 40 s (Optilux 501, Demetron Kerr) or were allowed to self-cure for 10 min in the dark (n = 5). All specimens were then stored in humidity at 37°C for 24 h in the dark and were subjected to KHN analysis. The results were submitted to 2-way ANOVA and Tukey's post-hoc test at a pre-set alpha of 5%. All the light-activated groups exhibited higher KHN values than the self-cured ones (p = 0.00001), regardless of product. Among the self-cured groups, both composite resin core build-up materials showed higher KHN values than the dual-cured resin cement (p = 0.00001). LuxaCore  -Dual exhibited higher KHN values than FluoroCore  2 (p = 0.00001) when they were allowed to self-cure, while no significant differences in KHN values were observed among the light-activated products. The results suggest that dual-cured composite resin core build-up materials may be more reliable than dual-cured resin cements when curing light is not available.

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“…Dental polymers, specifically resin cements, have been used considerably in recent years due to a larger application of dental adhesive procedures [1,2].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Exposure Time on the Surface Microhardness of Three Dual-Cured Dental Resin Cements

et al. 2011

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This study evaluated the exposure time of light-curing of the polymers used for cementation on microhardness test in different storage times. The polymers (specifically called resin cements) were RelyX ARC, RelyX U100, and SET. Five specimens of each group were prepared and photo-polymerized with exposure times of 20 s and 180 s, using a LED polymerization unit with wavelength of 440 ~ 480 nm and light output was consistently 1,500 mW/cm 2 . The Vickers hardness test was performed in a MMT-3

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Effect of light-curing methods on resin cement knoop hardness at different depths

Cited by 13 publications

References 14 publications

Microhardness of dual-polymerized resin cement around a translucent fiber post in the intraradicular environment

Microhardness of dual-polymerized resin cement around a translucent fiber post in the intraradicular environment

Effect of curing mode on the hardness of dual-cured composite resin core build-up materials

The Effects of Exposure Time on the Surface Microhardness of Three Dual-Cured Dental Resin Cements

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