Pre-heating of high-viscosity bulk-fill resin composites: Effects on shrinkage force and monomer conversion

Tauböck, Tobias T.; Tarle, Zrinka; Marović, Danijela; Attin, Thomas

doi:10.1016/j.jdent.2015.07.014

Cited by 100 publications

(92 citation statements)

References 54 publications

(58 reference statements)

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“…While their physico-mechanical properties, handling characteristics and wear performance have been extensively tested [34][35][36][37][38][39], scientific data on the biocompatibility of bulk-fill composite materials are very scarce [22]. The present study is the first that investigated potential genotoxic effects emanating from resin-based bulk-fill materials.…”

Section: Discussionmentioning

confidence: 96%

Genotoxic potential of dental bulk-fill resin composites

et al. 2017

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Section: Discussionmentioning

confidence: 96%

Genotoxic potential of dental bulk-fill resin composites

et al. 2017

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“…Six resin composite materials were tested in this study: two flowable bulk-fill composites Experimental testing was conducted inside a temperature-controlled chamber at 25°C [21], which simulates intraoral temperature conditions after rubber dam placement [37].…”

Section: Methodsmentioning

confidence: 99%

“…In order to control reaction kinetics and minimize stress formation in composite restorations, manufactures incorporated proprietary high-molecular-weight base monomers, pre-polymer stress relievers, and stress-relaxant polymerization modulators in their bulk-fill materials [15,16]. While previous in vitro research substantiated that bulk-fill resin composites cause lower contraction forces [17,18] and less cuspal flexure [19,20] than conventional composite materials, other studies revealed no advantage of bulk-fill over conventional nanohybrid composites in terms of shrinkage stress development [21] and restoration margin integrity [22,23]. Furthermore, conflicting data exists on whether high-or low-viscosity bulk-fill resin composites display favorable shrinkage stress kinetics [24,25].…”

Section: Introductionmentioning

confidence: 99%

Polymerization shrinkage and shrinkage force kinetics of high- and low-viscosity dimethacrylate- and ormocer-based bulk-fill resin composites

2018

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The aim of the present study was to investigate polymerization shrinkage, shrinkage force development, and degree of monomer conversion of high- and low-viscosity dimethacrylate- and ormocer-based bulk-fill resin composites. Two flowable bulk-fill composites (SDR, x-tra base), two high-viscosity bulk-fill composites (Bulk Ormocer, SonicFill), and two conventional composite materials (Esthet X flow, Esthet X HD) were photoactivated for 20 s at 1275 mW/cm. Linear polymerization shrinkage and shrinkage force were recorded in real time using custom-made devices, and the force rate and time to achieve maximum force rate were determined. Degree of conversion was measured using Fourier-transform infrared spectroscopy. Data were analyzed with one-way ANOVA and Tukey's HSD post-hoc test, and bivariate correlations were computed (α = 0.05). The category of high-viscosity bulk-fill resin composites showed the significantly lowest polymerization shrinkage and force development. Within the tested flowable composite materials, SDR bulk-fill generated the significantly lowest shrinkage forces during polymerization and attained the significantly highest degree of conversion. Strong positive correlations were revealed between shrinkage force and both linear polymerization shrinkage (r = 0.902) and maximum force rate (r = 0.701). Linear shrinkage and shrinkage force both showed a negative correlation with filler volume content (r = - 0.832 and r = - 0.704, respectively). Bulk-fill resin composites develop lower shrinkage forces than their conventional flowable and high-viscosity counterparts, respectively, which supports their use for restoring high C-factor posterior cavities. Overall, bulk-fill composites with high filler amount and low force rate showed the most favorable shrinkage force characteristics.

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“…The increase in the degree of polymerization of RBCs may lead to better internal adaptation to cavity walls 15 , improved mechanical properties and increased wear resistance 13 . Taubock et al, 16 reported that RBC pre-heating significantly reduces shrinkage force formation of high-viscosity bulk-fill and conventional resin composites, while maintaining or increasing the degree of monomer conversion, dependent upon the specific composite material used. Surface hardness will develop over time after lightcuring period which is mainly attributed to post-irradiation polymerization 17 .…”

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The Effect of Composition, Temperature and Post-Irradiation Curing of Bulk Fill Resin Composites on Polymerization Efficiency

2016

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Objectives:To evaluate the polymerization efficiency of bulk fill resin-based composites (RBCs) and how their composition, temperature and post-irradiation polymerization influence the results. Methods and Materials: Eight bulk fill RBCs were investigated. Five specimens for each material were prepared for Vickers hardness measurements. The measurements were performed in three depths from the top of the surface of the specimens (0, 2 or 4 mm) immediately and 24 h after polymerization and for the highly viscous bulk fill RBCs after preheating at 54 o C. Statistical analysis was performed using one-way ANOVA and Tukey post hoc tests at a=0.05. Results: As the depth increases microhardness values reduce. The Vickers hardness measurements 24 h after photo-polymerization revealed higher values compared to those obtained immediately after photo-polymerization (p<0.05). There was an increase in microhardness of the RBC materials when preheated at 54 o C in comparison with the room temperature specimens (p<0.05).Conclusions: Polymerization efficiency of bulk fill RBCs is affected by their composition and increases with temperature and post-irradiation polymerization.

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Pre-heating of high-viscosity bulk-fill resin composites: Effects on shrinkage force and monomer conversion

Abstract: Composite pre-heating significantly reduces shrinkage force formation of high-viscosity bulk-fill and conventional resin composites, while maintaining or increasing the degree of monomer conversion, dependent upon the specific composite material used.

Cited by 100 publications

References 54 publications

Genotoxic potential of dental bulk-fill resin composites

Genotoxic potential of dental bulk-fill resin composites

Polymerization shrinkage and shrinkage force kinetics of high- and low-viscosity dimethacrylate- and ormocer-based bulk-fill resin composites

The Effect of Composition, Temperature and Post-Irradiation Curing of Bulk Fill Resin Composites on Polymerization Efficiency

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