Fluoride release rate from an orthodontic sealant and its clinical implications.
The objectives were to measure the rate and amount of fluoride ions released from the sealant over a period of 17 weeks and to determine whether the fluoride-releasing sealant has a recharging ability when fluoride ions are reintroduced into the environment. Disc-shaped specimens were prepared from two types of sealants: (1) 10 discs were made using a fluoride-releasing sealant and (2) 10 discs were made of a nonfluoride adhesive primer (control). An ion analyzer was used to measure the fluoride release using a fluoride ion-specific combination electrode. The results of the repeated measure analysis (F = 7.76) indicated that the fluoride-containing sealant released fluoride ions into the solution in sustained but significantly (P = .014) decreasing rates from a high of 0.074 +/- 0.04 ppm/week/mm2 in the first week to a low of 0.015 +/- 0.017 ppm/week/mm2 at the end of the 17th week. Furthermore, the Pro Seal discs had the ability to be recharged with fluoride ions introduced from a foaming solution of acidulated phosphate fluoride. The mean fluoride release rate one week after recharging was 0.354 +/- 0.095 ppm/week/mm2 and decreased to 0.014 +/- 0.009 ppm/week/mm2 after eight weeks. The control sealant showed no significant fluoride release and was unable to absorb the fluoride ions available in the solution. The fluoride-containing sealant Pro Seal released fluoride ions in sustained but significantly decreasing amounts. The Pro Seal discs had the ability to be recharged with fluoride ions.
Department of Conservative Dentistry, College of Dentistry, Al-Menia University, Egypt.
Manal M
MM
Soliman
Samir E
SE
Bishara
James
J
Wefel
Judi
J
Heilman
John J
JJ
Warren
D002327:Cariostatic Agents / Q000737:chemistry*; D005459:Fluorides / Q000737:chemistry*; D010895:Pit and Fissure Sealants / Q000737:chemistry*; D013997:Time Factors; D014100:Toothpastes / Q000737:chemistry
D002327:Cariostatic Agents; D010895:Pit and Fissure Sealants; D014100:Toothpastes; D005459:Fluorides