Hardness, polymerization depth, and internal adaptation of Class II silorane composite restorations as a function of polymerization protocol

Bechtold, Janaina; Santos, Priscila Jaques dos; Anido-Anido, A.; Hipólito, Vinícius Di; Alonso, Roberta Caroline Bruschi; D’Alpino, Paulo Henrique Perlatti

doi:10.1055/s-0039-1698942

Cited by 19 publications

(19 citation statements)

References 29 publications

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“…Another important consideration in the results of this study is a better marginal seal of cavities restored with silorane-based composite resin compared to dimethacrylate-based composite resin, consistent with the results of studies by Bechtold et al, 36 Nanjundasetty et al, 37 Krifka et al 38 and Bin Hasan and AL Saif, 39 who reported a better performance of silorane-based composite resins in terms of marginal adaptation. However, Arslan et al 12 did not report any differences between these two composite resin types, which was attributed to the nano-filled nature of the used dimethacrylate-based composite resin.…”

Section: Discussionsupporting

confidence: 89%

The effect of repeated preheating of dimethacrylate and silorane-based composite resins on marginal gap of class V restorations

P¹,

F²,

Navimipour³

et al. 2017

J Dent Res Dent Clin Dent Prospects

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Background. One of the problems with composite resin restorations is gap formation at resin‒tooth interface. The present study evaluated the effect of preheating cycles of silorane- and dimethacrylate-based composite resins on gap formation at the gingival margins of Class V restorations.Methods. In this in vitro study, standard Class V cavities were prepared on the buccal surfaces of 48 bovine incisors. For restorative procedure, the samples were randomly divided into 2 groups based on the type of composite resin (group 1: di-methacrylate composite [Filtek Z250]; group 2: silorane composite [Filtek P90]) and each group was randomly divided into 2 subgroups based on the composite temperature (A: room temperature; B: after 40 preheating cycles up to 55°C). Marginal gaps were measured using a stereomicroscope at ×40 and analyzed with two-way ANOVA. Inter- and intra-group comparisons were analyzed with post-hoc Tukey tests. Significance level was defined at P < 0.05.Results. The maximum and minimum gaps were detected in groups 1-A and 2-B, respectively. The effects of composite resin type, preheating and interactive effect of these variables on gap formation were significant (P<0.001). Post-hoc Tukey tests showed greater gap in dimethacrylate compared to silorane composite resins (P< 0.001). In each group, gap values were greater in composite resins at room temperature compared to composite resins after 40 preheating cycles (P<0.001).Conclusion. Gap formation at the gingival margins of Class V cavities decreased due to preheating of both composite re-sins. Preheating of silorane-based composites can result in the best marginal adaptation.

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Section: Discussionsupporting

confidence: 89%

The effect of repeated preheating of dimethacrylate and silorane-based composite resins on marginal gap of class V restorations

P¹,

F²,

Navimipour³

et al. 2017

J Dent Res Dent Clin Dent Prospects

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“…39 The samples in group 4 underwent a bleaching procedure with LED light at a light intensity over 1000 mW/cm 2 ; therefore, it is hypothesized that curing percentage of composite resins increased during bleaching under the effect of this light intensity; an increase in curing percentage results in an increase in polymerization of composite resin, which in itself increases microhardness. 40 This phenomenon compensates a decrease in composite resin microhardness due to bleaching.…”

Section: Discussionmentioning

confidence: 99%

Effect of different bleaching strategies on microhardness of a silorane-based composite resin

Bahari

Oskoee

Mohammadi

et al. 2016

J Dent Res Dent Clin Dent Prospects

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Background. Dentists’ awareness of the effects of bleaching agents on the surface and mechanical properties of restorative materials is of utmost importance. Therefore, this in vitro study was undertaken to investigate the effects of different bleaching strategies on the microhardness of a silorane-based composite resin.Methods. Eighty samples of a silorane-based composite resin (measuring 4 mm in diameter and 2 mm in thickness) were prepared within acrylic molds. The samples were polished and randomly assigned to 4 groups (n=20). Group 1 (controls) were stored in distilled water for 2 weeks. The samples in group 2 underwent a bleaching procedure with 15% carbamide peroxide for two weeks two hours daily. The samples in group 3 were bleached with 35% hydrogen peroxide twice 5 days apart for 30 minutes each time. The samples in group 4 underwent a bleaching procedure with light-activated 35% hydrogen peroxide under LED light once for 40 minutes. Then the microhardness of the samples was determined using Vickers method. Data were analyzed with one-way ANOVA and post hoc Tukey tests (P < 0.05).Results. All the bleaching agents significantly decreased microhardness compared to the control group (P < 0.05). In addition, there were significant differences in microhardness between groups 2 and 4 (P = 0.001) and between groups 3 and 4 (P<0.001). However, no significant differences were detected in microhardness between groups 2 and 3 (P > 0.05).Conclusion. Bleaching agents decreased microhardness of silorane-based composite resin restorations, the magnitude of which depending on the bleaching strategy used.

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“…However, as the microhardness is the indirect methods to verify DC characterizing the monomer conversion, hardness values do not always predict the DC in comparisons of different resin materials. Despite of similar DC, 3-D structures of polymerized composite with different concentrations of C=C bonds can coexist in the same polymer structure 31. Also, microhardness can be influenced by monomer phase and filler phase.…”

Section: Discussionmentioning

confidence: 99%

The effect of resin thickness on polymerization characteristics of silorane-based composite resin

et al. 2014

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ObjectivesThis study examined the influence of the resin thickness on the polymerization of silorane- and methacrylate-based composites.Materials and MethodsOne silorane-based (Filtek P90, 3M ESPE) and two methacrylate-based (Filtek Z250 and Z350, 3M ESPE) composite resins were used. The number of photons were detected using a photodiode detector at the different thicknesses (thickness, 1, 2 and 3 mm) specimens. The microhardness of the top and bottom surfaces was measured (n = 15) using a Vickers hardness with 200 gf load and 15 sec dwell time conditions. The degree of conversion (DC) of the specimens was determined using Fourier transform infrared spectroscopy (FTIR). Scratched powder of each top and bottom surface of the specimen dissolved in ethanol for transmission FTIR spectroscopy. The refractive index was measured using a Abbe-type refractometer. To measure the polymerization shrinkage, a linometer was used. The results were analyzed using two-way ANOVA and Tukey's test at p < 0.05 level.ResultsThe silorane-based resin composite showed the lowest filler content and light attenuation among the specimens. P90 showed the highest values in the DC and the lowest microhardness at all depth. In the polymerization shrinkage, P90 showed a significantly lower shrinkage than the rest two resin products (p < 0.05). P90 showed a significantly lower refractive index than the remaining two resin products (p < 0.05).ConclusionsDC, microhardness, polymerization rate and refractive index linearly decreased as specimen thickness linearly increased. P90 showed much less polymerization shrinkage compared to other specimens. P90, even though achieved the highest DC, showed the lowest microhardness and refractive index.

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Hardness, polymerization depth, and internal adaptation of Class II silorane composite restorations as a function of polymerization protocol

Cited by 19 publications

References 29 publications

The effect of repeated preheating of dimethacrylate and silorane-based composite resins on marginal gap of class V restorations

The effect of repeated preheating of dimethacrylate and silorane-based composite resins on marginal gap of class V restorations

Effect of different bleaching strategies on microhardness of a silorane-based composite resin

The effect of resin thickness on polymerization characteristics of silorane-based composite resin

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