IADR Abstract Archives

Influence of temperature on bulk-fill composites’ post-cure degree of conversion

Objective: To investigate the effect of temperature on the post-cure behavior of one conventional and three bulk-fill composite materials.

Methods: A conventional composite GrandioSO (GR) and three bulk-fill composites: Tetric EvoCeram Bulk Fill (TECBF), Quixfil (QF) and X-tra fil (XF) were investigated. The samples were cured for 20 seconds with irradiance of 1090 mW/cm2. For each composite, 10 samples were prepared and randomly divided into two groups: the “room-temperature group” (RTG, n=5) and the “body-temperature group” (BTG, n=5) which were stored in dark at 20°C and 37°C, respectively. Degree of conversion (DC) was determined by means of Raman spectroscopy. DC measurements were made at the sample surface immediately after curing (0h) and 24h post-cure (24h). To analyze the extent of post-cure DC increase, 0h-RTG/24h-RTG and 0h-BTG/24h-BTG were compared for each composite by dependent samples t-test. To analyze the difference in DC between RTG and BTG, the DC values of 0h-RTG/0h-BTG and 24h-RTG/24h-BTG were compared for each composite by independent samples t-test.

Results: DC values (%) (0h/24h) for RTG were: GR 60.5/68.6, TECBF 59.3/65.6, QF 64.4/72.6, XF 63.6/71.5; for BTG: GR 58.0/73.8, TECBF 61.6/76.7, QF 65.8/78.3, XF 60.9/75.0. DC increase 24h post-cure was significant for all composites and ranged between 6.3%-8.2% in RTG and 12.5%-15.7% in BTG. Since there was no significant difference between 0h-RTG and 0h-BTG for each individual composite, equal initial DC for both groups was assumed. The impact of temperature on post-cure behavior was evaluated by comparing 24h-RTG/24h-BTG. All composites demonstrated higher DC in 24h-BTG compared to 24h-RTG. The difference was statistically significant for GR, TECBF and QF, while for XF only a trend of increase was observed.

Conclusion: Post-cure temperature increase from 20°C-37°C yielded higher post-cure DC increase, which should be taken into account while investigating composite properties.

This study was supported by Croatian Science Foundation.

Pan European Region Meeting
2014 Pan European Region Meeting (Dubrovnik, Croatia)
Dubrovnik, Croatia
2014
118
Scientific Groups
  • Par, Matej  ( Private Dental Practice, Zagreb, , Croatia )
  • Gamulin, Ozren  ( School of Medicine, University of Zagreb, Zagreb, , Croatia )
  • Marovic, Danijela  ( School of Dental Medicine, University of Zagreb, Zagreb, , Croatia )
  • Klaric, Eva  ( School of Dental Medicine, University of Zagreb, Zagreb, , Croatia )
  • Mandic, Visnja  ( Clinical Hospital Center Zagreb, Zagreb, , Croatia )
  • Tarle, Zrinka  ( School of Dental Medicine, University of Zagreb, Zagreb, , Croatia )
  • Poster Session
    Bulk-fill Composites
    09/11/2014