Effect of resin matrix composition on the translucency of experimental dental composite resins

Azzopardi, Natasha; Moharamzadeh, Keyvan; Wood, Duncan J.; Martín, Nicolás; Noort, Richard van

doi:10.1016/j.dental.2009.07.011

Cited by 151 publications

(129 citation statements)

References 12 publications

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“…Light scattering is increased in materials with a large filler-matrix interface area, due to differences in the refractive indices between filler particles and resin matrix [6,8]. On the other hand, similar refractive indices of the components of resin composites, as demonstrated for Bis-GMA and silica fillers, have been shown to improve translucency in experimental materials, and a linear correlation between the percentage of Bis-GMA in the organic matrix and light transmittance has been established [50]. The following data on the translucency of the test materials were available from the manufacturers: TECBF 15%, QF 17%, XF 23% and conventional TEC around 10%.…”

Section: Discussionmentioning

confidence: 89%

Influence of irradiation time on subsurface degree of conversion and microhardness of high-viscosity bulk-fill resin composites

et al. 2014

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OBJECTIVES To evaluate the influence of irradiation time on degree of conversion (DC) and microhardness of high-viscosity bulk-fill resin composites in depths up to 6 mm. MATERIALS AND METHODS Four bulk-fill materials (Tetric EvoCeram Bulk Fill-TECBF; x-tra fil-XF; QuixFil-QF; SonicFill-SF) and one conventional nano-hybrid resin composite (Tetric EvoCeram-TEC) were irradiated for 10, 20, or 30 s at 1,170 mW/cm(2). DC and Knoop microhardness (KHN) were recorded after 24-h dark storage at five depths: 0.1, 2, 4, 5, and 6 mm. Data were statistically analyzed using ANOVA and Bonferroni's post-hoc test ( = 0.05). RESULTS With increasing bulk thickness, DC and KHN significantly decreased for TEC. TECBF and SF showed a significant decrease in DC and KHN at 4-mm depth after 10-s irradiation, but no decrease in DC after 30-s irradiation (p > 0.05). XF and QF demonstrated no significant DC decrease at depths up to 6 mm after irradiation of at least 20 s. At 4-mm depth, all materials tested achieved at least 80 % of their maximum DC value, irrespective of irradiation time. However, at the same depth (4 mm), only XF and QF irradiated for 30 s achieved at least 80 % of their maximum KHN value. CONCLUSIONS Regarding DC, the tested bulk-fill resin composites can be safely used up to at least 4-mm incremental thickness. However, with respect to hardness, only XF and QF achieved acceptable results at 4-mm depth with 30 s of irradiation. CLINICAL RELEVANCE Minimum irradiation times stated by the manufacturers cannot be recommended for placement of highviscosity bulk-fill materials in 4-mm increments. Conclusions: Regarding DC, the tested bulk-fill resin composites can be safely used up to at least 4-mm incremental thickness. However, with respect to hardness, only XF and QF achieved acceptable results at 4-mm depth with 30 s of irradiation.Clinical relevance: Minimum irradiation times stated by the manufacturers cannot be recommended for placement of high-viscosity bulk-fill materials in 4-mm increments.

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Section: Discussionmentioning

confidence: 89%

Influence of irradiation time on subsurface degree of conversion and microhardness of high-viscosity bulk-fill resin composites

et al. 2014

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“…The increased filler size leads to a lower filler-matrix interface and as a result to a decreased light scattering and enhanced light transmittance through the materials 7 . Moreover, differences in the refractive indices between the fillers and the organic matrix of the RBC materials affect their translucency 29 . The outcomes of the present study indicated that XF and EXP showed the highest Vickers hardness at 2 and 4 mm.…”

Section: Discussionmentioning

confidence: 99%

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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“…The translucency of composite resins for direct restorations and the factors influencing it, for example the matrix, brand or manner of light polymerisation, have been the subject of several previous studies [15][16][17] . Besides the translucency of the polymers, it is of particular interest whether the materials exhibit fluorescent properties, as this parameter impacts the optical behaviour of dental restorations in the oral cavity.…”

Section: Introductionmentioning

confidence: 99%

Optical properties of manually and CAD/CAM-fabricated polymers

et al. 2013

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Effect of resin matrix composition on the translucency of experimental dental composite resins

Cited by 151 publications

References 12 publications

Influence of irradiation time on subsurface degree of conversion and microhardness of high-viscosity bulk-fill resin composites

Influence of irradiation time on subsurface degree of conversion and microhardness of high-viscosity bulk-fill resin composites

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

Optical properties of manually and CAD/CAM-fabricated polymers

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