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Journal of Dental Research, Vol 55, 606-610, Copyright © 1976 by International & American Associations for Dental Research Online Journals

ARTICLES

Thermocycling of pit and fissure sealants

E. W. Simmons, N. Barghi and J. R. Muscott

Both sealants experience early thermocyclic failure, which is manifested as marginal breakdown or separation. From the 20 to 70% failure range (Fig 5) Nuva Seal was three times as resistant to thermocyclic stressing as was Epoxylite 9075. That is, the Nuva Seal-sealed teeth had to be cycled three times more than the Epoxylite 9075-sealed teeth to effect the same failure rates. Both Epoxylite and Nuva Seal reach the same failure rate at 7,000 cycles (75% failure rate). Extremely careful visual examination is required to detect marginal separation failures of pit and fissure sealants.




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