Polymerization Shrinkage and Flexural Modulus of Flowable Dental Composites

Xavier, Janaína Cavalcanti; Monteiro, Gabriela Queiroz de Melo

doi:10.1590/s1516-14392010000300017

Cited by 15 publications

(13 citation statements)

References 10 publications

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“…The gap formation analysis was conducted using metallic molds in order to indirect calculate polymerization shrinkage (14,15). Disc-shaped samples with 2 mm in thickness and 6.0 mm in diameter (n=8) were produced from metallic molds under the same photo-activation protocol described before.…”

Section: Polymerization Shrinkage By Gap Formation (Gf) Using Confocamentioning

confidence: 99%

Solvent Degradation and Polymerization Shrinkage Reduction of Resin Composites Using Isobornyl Methacrylate

et al. 2019

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The aim of this study was to use the isobornyl methacrylate (IBOMA) as a combining or substituent diluent monomer in the resin matrix of dental resin composites. Thus, the resin matrix was formulated with 60 wt% of BisGMA and 40 wt% of diluent monomers. TEGDMA as the only diluent monomer was used as control with 40 wt%, while total substitution of TEGDMA was done with 40 wt% of IBOMA. The combination of IBOMA and TEGDMA was done with 20 wt% of each monomer. To the resin matrix, 65 wt% of filler particles was added. Degree of conversion (DC) using FT-IR, flexural strength (FS), flexural modulus (FM), polymerization shrinkage by gap formation (GF), Knoop hardness (KH) and solvent degradation (SD) were evaluated. Data were analyzed using ANOVA and Tukey’s test (α=0.05; b=0.2). The results showed that reducing or substituting TEGDMA using IBOMA did not affect the DC (0.085), FS (p=0.886) or FM (p=0.414). Also, when IBOMA was used, lower GF was found in comparison to the control containing only TEGDMA as the diluent monomer (p=0.032). However, even though all composites presented reduction in KH during the SD test, the combination of IBOMA and TEGDMA showed similar reduction in KHN in comparison to the control group (p=0.001), while the total substitution of TEGDMA with IBOMA decreased KHN after SD (p=0.041). Thus, the combination of IBOMA and TEGDMA seem to reduce SD and GF without affecting the properties of resin composites.

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Section: Polymerization Shrinkage By Gap Formation (Gf) Using Confocamentioning

confidence: 99%

Solvent Degradation and Polymerization Shrinkage Reduction of Resin Composites Using Isobornyl Methacrylate

et al. 2019

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“…Especially, the composite reinforced by the Group-(iii) glass fibres shows the highest value of 115.15 ± 6.72 MPa in flexural strength. Figure 4b represents the typical values of strength and modulus of polymer based dental materials 17,38,39 , human teeth (enamel and dentin) 40–44 and cortical bones 45,46 , and current work. It can be seen that the current work achieved reasonable increase in flexural strength and modulus when compared to the commercial dental composites.…”

Section: Resultsmentioning

confidence: 99%

Selective Atomic-Level Etching on Short S-Glass Fibres to Control Interfacial Properties for Restorative Dental Composites

Cho

Wang

Raju

et al. 2019

Sci Rep

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Interfacial bonding between fibre and matrix is most critical to obtain enhanced mechanical properties of the resulting composites. Here we present a new surface tailoring method of selective wet etching and organosilicon monomers (3-(Trimethoxysilyl) propyl methacrylate, TMSPMA) deposition process on the short S-Glass fibre as a reinforcing material, resulting in increased mechanical retention and strong chemical bonding between glass fibres and polymer resin (a mixture of triethylene glycol dimethacrylate (TEGDMA) and urethane dimethacrylate (UDMA) monomers). The effect of surface modification on fibre matrix interfacial strength was investigated through microdroplet tests. An S-Glass fibre treated with piranha solution (a mixture of H 2 O 2 and H 2 SO 4 ) for 24 hours followed by TMSPMA surface silanization shows highest increase up to 39.6% in interfacial shear strength (IFSS), and critical fibre length could be reduced from 916.0 µm to 432.5 µm. We find the optimal surface treatment condition in that the flexural strength of dental composites reinforced by the S-Glass fibres enhanced up to 22.3% compared to the composites without fibre surface treatments. The significant elevation in strength is attributed to changes in the surface roughness of glass fibres at atomic scale, specifically by providing the multiplied spots of the chemical bridge and nano-mechanical interlocking. The findings offer a new strategy for advanced tailoring of short S-Glass fibres to maximise the mechanical properties of biomedical and dental composites.

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“…They are advantageous in relieving stresses during polymerization shrinkage of restorative resin. [ 32 ] According to Hooke's law,[ 33 ] stress is related to elastic modulus of material. Polymerization shrinkage can initially increase stress along the tooth–adhesive interface.…”

Section: Discussionmentioning

confidence: 99%

Push-out bond strength of different intracanal posts in the anterior primary teeth according to root canal filling materials

et al. 2017

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Background:This study was carried out to evaluate the effect of root canal filling on the bond strength of three intracanal posts in the primary incisors.Materials and Methods:Sixty primary incisors were prepared and then divided into two groups (n = 30). The first group canals obturated with zinc oxide eugenol (ZOE) and Group 2 canals obturated with Metapex. Further, the two group categories were divided into three subgroups (n = 10): (1) short composite post (SCP), (2) glass fiber posts (GFPs) cemented with flowable composite, and (3) GFP with glass ionomer cement (GFP + GIC). The push-out test was performed with a universal testing machine. The results were statistically analyzed with two-way analysis of variance.(α = 0.05).Results:The mean bond strength of the first group obturated with ZOE was lower than that of the second group obturated with Metapex (P = 0.046). Moreover, from a statistical point of view, in all three subgroups, the correlation of mean push-out bond strength between SCP and GFP coated with flowable composite was not substantial at P = 0.97. However, the mean bond strength of SCP was in fact significantly greater than that of the GFP coated with GIC since P = 0.034.Conclusion:Using ZOE resulted in the significant reduction of the mean bond strength of the intracanal posts when utilized in the primary anterior teeth. Likewise, SCP and GFP coated with flowable composite showed higher push-out bond strengths for restoring primary anterior teeth.

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Polymerization Shrinkage and Flexural Modulus of Flowable Dental Composites

Cited by 15 publications

References 10 publications

Solvent Degradation and Polymerization Shrinkage Reduction of Resin Composites Using Isobornyl Methacrylate

Solvent Degradation and Polymerization Shrinkage Reduction of Resin Composites Using Isobornyl Methacrylate

Selective Atomic-Level Etching on Short S-Glass Fibres to Control Interfacial Properties for Restorative Dental Composites

Push-out bond strength of different intracanal posts in the anterior primary teeth according to root canal filling materials

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