MATERIALS AND METHODS: Seventy-two extracted non-carious human permanent molars were divided into three groups for sealing using Triage (T), Delton with Prime & Bond NT(DP), and Delton(D) alone. Following prophylaxis with pumice, Groups D and DP were etched with 38% H3PO4 for 30 seconds. Group T was treated with Cavity-Conditioner. A single drop of natural-saliva was applied to the occlusal surface with a microbrush. Sealants were then placed using the manufacturer's directions. Bonding-agent was applied and light cured for 20 seconds prior to the application of Delton for DP group. All sealants covered the entire occlusal surface. The groups were further subdivided into three time-evaluation intervals: 6 months, 1 year and 2 years, 8 samples each. They were thermocycled (5º-55ºC, 1 min. dwell time) equal to 6 months, 1 year and 2 years time. After each thermocycling period, they were subjected to toothbrush abrasion for their respective times. All samples were finally observed clinically for retention of sealant. Samples with clinically visible loss of material were further evaluated under ESEM to verify the loss in the pit and fissures.
RESULTS: Following thermocycling for 6 months, 5 of the 24 samples (21%) of Group D revealed complete visual loss of sealant. There was no further loss after 1 year. Following a second year of thermocycling, an additional four samples revealed complete visible loss of the sealant material from Group D(total 37.5% failure). ESEM evaluation verified the complete loss of sealants.
CONCLUSION: Groups T and DP showed 100% retention after simulating two years of aging and toothbrush-abrasion. Both of these groups demonstrated similar wear rates. Therefore, concerning fluoride release and simpler technique, especially with newly-erupting molars, Triage has advantages.
GC America supported this study.