Polymerization efficiency and flexural strength of low-stress restorative composites

Cecilia Goracci*, Milena Cadenaro, Luca Fontanive, Giuseppe Giangrosso, Jelena Juloski, Alessandro Vichi, Marco Ferrari

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Objectives: To assess depth of cure (DOC), degree of conversion (DC), and flexural strength (FS) of several resin composites with low-stress behavior. 

Methods: SonicFill (Kerr), SureFil® SDR™ (Dentsply), everX Posterior (GC), Kalore (GC), and Filtek Silorane (3M ESPE) were tested. DOC was measured with the Acetone Shake test. DC was assessed with Fourier Transform Infra-Red spectroscopy on top and at the bottom of 4 mm-thick disk-shaped specimens. Bottom to top ratios of DC percentages were calculated. FS was evaluated with the Three-Point Bending test. DOC, DC, and FS data were statistically analyzed. 

Results: SureFil® SDR™ and everX Posterior achieved significantly greater DOC than Kalore and Filtek Silorane. Also, SonicFill had significantly greater DOC than Filtek Silorane. Mean top DCs ranged between 71.46% and 52.44%. Kalore and everX Posterior had significantly lower top DCs than the other materials. Mean DC values at 4 mm ranged largely from 57.95% to 6.82%. Kalore and Filtek Silorane had the lowest values of bottom DC and the difference was statistically significant. EverX Posterior and SonicFill recorded significantly higher FSs than the other materials. 

Significance: SureFil® SDR™ and everX Posterior exhibited DOC over 4 mm, the maximum thickness recommended for bulk placement, while SonicFill recorded DOC values very close to the 4 mm threshold. SonicFill achieved the highest DC at the irradiated surface, as well as at 4 mm depth. SureFil® SDR™ demonstrated similarly uniform curing through the bulk increment. All the tested composites complied with the requirements of FS established by ISO 4049/2009.

Original languageEnglish
Pages (from-to)688-694
Number of pages7
JournalDental Materials
Issue number6
Early online date3 Apr 2014
Publication statusPublished - 1 Jun 2014


  • bulk-fill
  • flexural strength
  • low-stress
  • polymerization
  • resin composite


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