TY - BOOK AU - Adnan Attas Hassan Alattas AU - Hebatalla Mohamed Maged Elfar , AU - Latifa Mohamed Abdelgawad , TI - Comparison of portland cement versus MTA as retrograde filling materials using laser , ultrasonic and conventional root end cavity preparation : : An vitro study / PY - 2010/// CY - Cairo : PB - Adnan Attas Hassan Alattas , KW - Diode laser KW - MTA KW - Portland cement N1 - Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Endodontics; Issued also as CD N2 - The purpose of this study was to evaluate the sealing ability of Portland cement and MTA in comparison to amalgam as retrograde filling materials by utilizing three different root - end preparatory methods ( Laser , ultrasonic and conventional techiques ) . One hundred and twenty eight teeth were used divided into three main experimantal groups (n=36) : (1) diode laser preparation (L) (980nm 8 w\10 sec.) UR - http://172.23.153.220/th.pdf ER -