Pit and fissure sealants introduced by Cueto and Buonocore in 1967 have been accepted as an efficient caries preventive method. For most of the period since the introduction of the sealants, the focus has been on Bis-GMA resin based materials. Resin based sealants have been tested on many occasions and have generally been shown to be an effective method of caries prevention for children and young adults,. The efficacy of these resin sealants in preventing caries has been associated with the duration and degree of sealant retention.