Background:Continuous chelation can be defined as the concept of using a single mix weak chelator with NaOCL throughout entire root canal preparation procedure without causing reduction in antimicrobial and proteolytic activity NaOCL. Etidronic acid, also known "1-Hydroxyethylidene-1, 1-Bisphosphonate" HEBP, or HEDP, is soft biocompatible utilized direct combination sodium hypochlorite to form ...

The electronic properties responsible for free radical scavenging and metal chelation of a set of 7 flavonoids compounds were studied. Electronic parameters were calculated using semi empirical PM3 method. The structure activity relationship of OH substitution, C2-C3 double bond, chelation site of flavonoid and related property of antioxidant efficiency, BDE, mulliken atomic charge, electron cu...