Akademik Veri Yönetim Sistemi
AMERICAN JOURNAL OF DENTISTRY, cilt.20, sa.4, ss.255-258, 2007 (SCI-Expanded)
Purpose: To evaluate in vitro the curing effect of a very high intensity light-emitting diode (LED) unit and a conventional LED unit (including "soft-start" modes) on the microleakage of a pit and fissure sealant. Methods: 120 intact caries-free human molars were randomly divided into six groups (n=20), sealed with Fissurit-F and polymerized using either a conventional halogen unit (Optilux) (Control group) in standard mode (40 seconds @ 600 mW/cm(2)); a very high intensity LED unit (Mini LED) in fast (10 seconds @ 1,100 mW/cm(2)) or soft-start mode (pulse mode: ten 1 second flashes @ 1, 100 mW/cm(2); exponential mode: exponential increase from 0 to 1,100 mW/cm(2) within 10 seconds followed by 10 seconds @1,100 mW/cm(2)); or a conventional LED unit (Elipar Freelight) in standard (40 seconds @ 400 mW/cm(2)) or exponential mode (exponential increase from 0 to 400mW/cm(2) within 12 seconds followed by 28 seconds @ 400 mW/cm(2)). Restored specimens were stored in distilled water at 37 degrees C for 24 hours. Specimens were then immersed in a 0.5% fuchsin dye solution for 24 hours, with half of the specimens from each group subjected to thermocycling (5/55C; x 1000) prior to dye immersion. After removal from the dye solution, specimens were sectioned and the degree of dye penetration scored. Data was statistically analyzed using the Kruskal-Wallis H test and the Mann-Whitney U-test (P < 0.05). Results: There was no statistically significant difference in microleakage of pit and fissure sealant polymerized using various curing techniques. Thermocycling regimens had no effect on either LED- or halogen-cured specimens.