Polymerization stress evolution of a bulk-fill flowable composite under different compliances

Guo, Yong; Landis, Forrest A.; Wang, Zhengzhi; Bai, Ding; Li, Jiang; Chiang, Martin Y.

doi:10.1016/j.dental.2016.01.009

Cited by 24 publications

(13 citation statements)

References 39 publications

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“…Studies have demonstrated that the temperature rise is greater for bulk-fill composites compared to conventional controls, as measured in the composite itself [92, 93], but the effects of this elevated heat generation on the dental pulp have yet to be investigated. In conclusion, clinical studies with these materials are still very scarce, but the first few reports demonstrate they are at least as effective as conventional materials in the short-term, as far as marginal integrity is concerned.…”

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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Section: Bulk-fill Materialsmentioning

confidence: 99%

Polymer-Based Direct Filling Materials

Pfeifer

2017

Dental Clinics of North America

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“…9 These restorative materials have reduced polymerization stress, better flow, easy placement with excellent adaptation to the preparation walls, and low modulus of elasticity which can further decrease the stress generated on the preparation walls. [10][11][12][13][14][15] The protocol for layering technique is also not required and, thus, they have emerged as the most suitable alternative for the postendodontic restorations. 9 Another recent trend involving the composites is preheating.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Coronal Leakage of Preheated Nanohybrid and Bulk Fill Composites in Endodontically Treated Teeth: Anin vitroStudy

Arora¹,

Arora²,

Soliman³

2018

World Journal of Dentistry

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Aim:The aim of this study was to evaluate coronal leakage of preheated nanohybrid and bulk fill composites in endodontically treated teeth. Materials and methods:A total of 100 human mandibular premolars were divided into six groups after standardized root canal treatment protocol: group I (n = 20): nanohybrid composite (Filtek Z250XT); group II (n = 20): preheated nanohybrid composite; group III (n = 20): bulk fill composite (Filtek Bulk fill); group IV (n = 20): bulk fill composite (Filtek™ Bulk fill); group V (negative control) (n = 10): Gutta-percha was kept intact till orifice and covered with nail polish; and group VI (positive control) (n = 10): Gutta-percha was kept intact till orifice. The samples were thermocycled followed by dye penetration with 2% methylene blue. Scoring was done under stereomicroscope at 10× magnification. Kruskal-Wallis test, Wilcoxon signedrank test, and Mann-Whitney U test were applied. There was significant difference among all the groups.Results: Preheated bulk fill composites sealed significantly better. Nanohybrid composites displayed the highest microleakage followed by preheated nanohybrid composite. Bulk fill composites were better than preheated nanohybrid composites. Conclusion:Preheating decreases microleakage of nanohybrid and bulk fill composites. Bulk fill composites, especially when preheated, are superior in performance to nanohybrid composites in terms of microleakage.Clinical significance: Preheated bulk fill composites are a suitable alternative to nanohybrid composites for the improvement of marginal integrity of restorations in endodontically treated teeth.

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“…One advantage of higher exotherm is that it would result in greater thermal expansion and an increase in free volume, which helps in alleviating the residual polymerisation stresses. Hence, if the remaining dentine in the tooth to be restored is greater than 1.0 mm, the higher exotherm would help ensure the marginal integrity of the restoration 58,59 . For all the three groups, the resin volume fraction and total filler volume were kept constant and the thickness of the samples was just 1 mm as per ISO 4049.…”

Section: Discussionmentioning

confidence: 99%

Dimensional stability of short fibre reinforced flowable dental composites

Raju

Rajan

Farrar³

et al. 2021

Sci Rep

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Fibre-reinforced dental composites are proven to have superior mechanical properties in comparison with micro/nano/hybrid filled composites. However, the addition of small quantities of short glass fibres could affect the dimensional stability of the restoration both during initial stages as well as through the life of the restoration. This in-vitro study aims at evaluating the physical properties of short S-Glass reinforced flowable dental composites. Two S-Glass short fibre-particulate reinforced (5 wt% of aspect ratios 50 and 70) and one particulate only reinforced flowable dental composites were prepared with UDMA-TEGDMA based dental monomer systems. Samples were photopolymersied for 60 s and stored in distilled water at 37 °C for 24 h before testing. Depth of cure (through-thickness microhardness), volumetric shrinkage (Archimedes technique), polymerisation stress (cantilever based tensometer), curing exotherm (thermocouple), water sorption and solubility (ISO 4049) and thermal expansion coefficient (dilatometer) were determined. The test results were statistically analysed using one-way ANOVA (p < 0.05). Depth of cure increased by 41%, volumetric shrinkage increased by 8.3%, shrinkage stress increased by 37.6%, exotherm increased by 20.2%, and thermal expansion reduced by 6.4% while water sorption and solubility had a negligible effect with the inclusion of short glass fibres. The study demonstrates that within the same organic resin system and quantity, a small replacement of fillers with short fibres could significantly affect the dimensional stability of the composite system. In conjunction with mechanical properties, this study could help clinicians to gain confidence in fibre reinforced dental composite restorative system.

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Polymerization stress evolution of a bulk-fill flowable composite under different compliances

Cited by 24 publications

References 39 publications

Polymer-Based Direct Filling Materials

Polymer-Based Direct Filling Materials

Evaluation of Coronal Leakage of Preheated Nanohybrid and Bulk Fill Composites in Endodontically Treated Teeth: Anin vitroStudy

Dimensional stability of short fibre reinforced flowable dental composites

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