TY  - BOOK
AU  - Marwa Nashaat Shawky Elmasry
AU  - Alaa Eldin H. Diab , 
AU  - Suzan Abdulwanees Amin , 
TI  - In vitro comparison of canal centering ability of ProTaper and twisted rotary files / 
PY  - 2012///
CY  - Cairo : 
PB  - Marwa Nashaat Shawky Elmasry , 
KW  - Gutta-percha
KW  - ProTaper Retreatment files
KW  - Root canal retreatment
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 compare the efficacy of three rotary NiTi systems; Protaper retreatment system, K3 endo rotary files, Twisted rotary files and Hedstrom hand files in the removal of gutta-percha filling material from root canals with moderate and severe curvatures.  Results: No statistically significant difference was observed between the amount of remaining filling in moderately and severely curved canals. At the apical third of the canals; the amount of remaining filling material was significantly lower using H-files and K3 rotary files. No significant difference was revealed between retreatment techniques at the middle, coronal thirds of the canals. Conclusions: None of the experimental techniques guaranteed complete removal of the filling material from the root canal system. Hedstrom hand files and K3 rotary system proved to be more efficient than Protaper retreatment files and Twisted files in the removal of filling material from curved root canal walls. The apical part remains a challenge during retreatment procedure
ER  -