The effect of Hand Stainless-Steel and NiTi Rotary file on vertical root fracture.


The aim of this study was to compare the fracture resistance of roots followingroot canal therapy using stainless-steel hand instrumentation (SS), Rotary Profile (PF)instrumentation, Rotary ProTaper instrumentation (PT). Forty-five mandibularpremolars teeth were divided into three groups of 15 teeth each, according to the typeof instrumentation. All root obturated with gutta-percha and AH26 sealer. The rootswere vertically loaded using a universal testing machine. Fracture loads were analysedby ANOVA and LSD test, and fracture patterns were analyzed with Chi-Square.Profile & ProTaper groups have significantly lower fracture load than handinstruments group (P < 0.05). Chi-Square showed a significant differences betweengroups (P < 0.05) .