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

Autori
Par, Matej ; Gamulin, Ozren ; Marović, Danijela ; Klarić, Eva ; Negovetić Mandić, Višnja ; Tarle, Zrinka

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
2014 Pan European Region Meeting. U: Journal of Dental Research. 2014 ; 93 (Special Issue C) / - , 2014, 118-118

Skup
International Association for Dental Research Pan- European Region Congress 2014

Mjesto i datum
Dubrovnik, Hrvatska, 10.09.2014. - 13.09.2014

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
composites ; dental materials ; polymerization

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Dentalna medicina

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