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الوقاية خير من العالج درهم وقاية خير من قنطار عالج Pit and Fissure Sealant Definition A fissure sealant is a material that is placed in the pits and fissures of teeth in order to prevent or arrest the development of dental caries. It is aprofessional preventive procedure. Introduction pits and fissures are the susceptible areas for the initiation of dental caries (shape,depth) Occlusal surface the most affected surfaces. Fissure sealant is underutilized. It should be cheap, accessible for larger population. Early attempts to reduce occlusal caries: • 1- Hyatt in 1923: • prophylactic odontomy technique Bodecker in 1929: fissure eradication Klein and Knutson in 1942: chemical agents- ammoniacal silver nitrate Bowen in 1965: developed the BisGMA resin the organic matrix Bisphenol-Glycidyl methacrylate . Cariostatic action of sealants: • Sealed surface is 2000 fold less in bacteria than non sealed. • Even for carious surface physical properity of sealant by prevent bact. To produce acid in cariogenic conc. Composition of sealants: •• •• •• •• •• chemically chemically curing curing sealants sealants ultra-violet ultra-violet rays rays for for curing curing sealants sealants visible visible light light cure cure sealants sealants filled filled or or unfilled unfilled transparent transparent or or opaque opaque ((Opaque Opaque materials materials are are available available as as tooth tooth coloured coloured or or white. white. The The transparent transparent sealants sealants are are clear, clear, pink or amber ) Selection Selection of of Teeth Teeth Manipulation Procedure 1) Cleaning: 2) Isolation: 3) Etching: 4) Washing: 5) Application of sealant: a) Chemically cured sealant. b) Light cured sealant. c) Glass ionomer. 6) Check occlusal interferences: 7) Re- evaluation: