Retention Rate of Hydroxyapatite Nano-Fiber Reinforced Flowable Composite Versus Conventional

Pits and fissures have been considered as the single most important feature leading to the development of occlusal caries; About 90 % of carious lesions are found in the pits and fissures of permanent posterior teeth .Several materials and techniques have been developed to enhance the longevity of pit-and-fissure sealants, including the use of flowable composite resins as pit-and-fissure sealants