Abstract:
 Aim: to evaluate the bone healing in failed endodontically treated teeth after surgical removal of periapical lesions and placement hydroxyapatite (HA), nanohydroxyapatite (nHA) a combination with platelet rich fibrin (PRF) periapically. Subjects methods: study was conducted on twenty-four patients having radiolucency single rooted teeth. The selected were divided into three gro...

Fish bone by-products are considered as abundant source of hydroxyapatite (HAp). The preparation HAp from fish bones not only contributes to improving the value but also minimizes negative impacts on environment. In this study, nanohydroxyapatite was successfully obtained Lates calcarifer purchased seafood export company in Khanh Hoa province. were under alkali treatment and then heated at 600o...