@book{13113, author = {Shawky, Aya Khaled Mohamed,}, title = {Color change and postoperative hypersensitivity of discolored teeth pretreated with microabrasion before bleaching using light versus chemically activated agents :}, year = {2017.}, note = {Supervisor : Olfat ElSayed Hassanein, Asmaa Ali Mohamed Yassen, Inas Mohsen El-Zayat.} }