How light attenuation and filler content affect the microhardness and polymerization shrinkage and translucency of bulk-fill composites?

Son, Sung Ae; Park, Jeong-Kil; Seo, Deog-Gyu; Ko, Ching Chang; Kwon, Yong Hoon

doi:10.1007/s00784-016-1920-2

Cited by 72 publications

(65 citation statements)

References 31 publications

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“…Overall, from 21 studies that assessed BFRCs microhardness, 10 reported acceptable bottom/top hardness ratios (≥0.8) for all materials whereas 9 studies showed material‐dependent outcomes . Conversely, only 2 investigations revealed non‐acceptable bottom/top hardness ratio (<0.8) for all BFRCs tested .…”

Section: Resultsmentioning

confidence: 98%

“…Thus, it is possible to hypothesize that an amount of ≥20 J/cm 2 may be the minimum energy dose required to polymerize 4 mm increments of BFRCs. Nevertheless, irradiance seems to have greater influence on the total energy dose, since extending curing times associated to lower irradiance delivery (<1000 mW/cm 2 ) produced deficient polymerization on some BFRCs …”

Section: Discussionmentioning

confidence: 99%

“…Consequently, there is a reduction in filler–matrix interface and light scattering, allowing light penetration through deeper zones . In addition, material viscosity seems to be an important factor on curing success of BFRCs because many selected investigations reported higher depth of cure for flowable materials compared with some high‐viscosity BFRCs . In the case of flowable BFRCs, the composition percentage of inorganic filler, ranges between 64 and 75 wt%/38 and 61 vol%.…”

Section: Discussionmentioning

confidence: 99%

“…Nevertheless, irradiance seems to have greater influence on the total energy dose, since extending curing times associated to lower irradiance delivery (<1000 mW/cm 2 ) produced deficient polymerization on some BFRCs. 37,40,43 Besides light curing conditions, chemical related factors also play an important role on polymerization success of composite resin. Generally, filler size from some commercially available BFRCs was increased up to 20 μm which decreases total particle volume percentage.…”

Section: Discussionmentioning

confidence: 99%

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Depth of cure of bulk fill resin composites: A systematic review

Lima

Troconis

Moreno

et al. 2018

J Esthet Restor Dent

105

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Objective To evaluate scientific evidence regarding depth of cure of bulk‐fill resin composites (BFRCs) and related factors. Material and Methods PubMed/Medline, Embase, Scopus, and ISI Web of Science databases were accessed from October 2016 to May 2017. Investigations published in English language, assessing depth of cure of BFRCs by microhardness test and/or degree of conversion (DC) were included. Studies using exclusively ISO 4049, employing specimens deepness less than 4 mm, as well as those not reporting exposure time and/or irradiance from light curing units (LCUs) were excluded. Results In total, 742 studies were found from which 33 were included. From 21 studies evaluating BFRCs microhardness, 10 showed acceptable bottom/top ratios (≥0.8) for all tested materials. However, material‐dependent results and non‐satisfactory bottom/top microhardness ratios (<0.8) were reported in 9 and 2 investigations, respectively. From 19 studies that assessed DC, 11 showed acceptable results (≥50%) for all tested BFRCs, while 8 studies reported material‐dependent outcomes. Overall, irradiance from LCUs ranged from 650 to 1330 mW/cm2 and exposure time from 5 to 60 seconds. Favorable depth of cure results were observed with the use of LCUs emitting irradiance ≥1000 mW/cm2 and exposure times ≥20 seconds. Conclusions High depth of cure rates by BFRCs, depends on some factors as material, irradiance and exposure time. Polywave LCUs were useful but not essential on polymerizing alternative photoinitiator‐containing BFRC. Clinical Significance LED curing devices (polywave or monowave) displaying an irradiance ≥1000 mW/cm2 and 20 seconds of exposure time are imperative to accomplish successful polymerization of most BFRCs.

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Section: Resultsmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Depth of cure of bulk fill resin composites: A systematic review

Lima

Troconis

Moreno

et al. 2018

J Esthet Restor Dent

105

View full text Add to dashboard Cite

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“…For the materials that use the flowable strategy, the rationale is that the lower filler content (in general) would decrease the light scattering through the material and provide better degree of conversion in depth [76–78]. This is was shown to be generally true for blue wavelengths, but shorter wavelengths in the UV range were shown to be significantly limited in terms of penetration depth despite the increased translucency of the material [79].…”

Section: Bulk-fill Materialsmentioning

confidence: 99%

Polymer-Based Direct Filling Materials

Pfeifer

2017

Dental Clinics of North America

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Synopsis After a brief review of current restorative materials and classifications, this article discusses the latest developments in polymer-based direct filling materials, with emphasis on products and studies available in the last 10 years. This will include the more recent bulk-fill composites and self-adhesive materials, for which clinical evidence of success, albeit somewhat limited, is already available. The article will also introduce the latest cutting edge research topics on new materials for composite restorations, and an outlook for the future of how those may help improve the service-life of dental composite restorations.

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