Shaping Abilities of Two Different Engine-Driven Rotary Nickel Titanium Systems or Stainless Steel Balanced-Force Technique in Mandibular Molars

Minimum Contact Time and Concentration of Sodium Hypochlorite Required to Eliminate Enterococcus faecalis

“…Clinically, actual root canal systems are more complex (37). In addition, technological advances have made procedures more efficient, leading to reduced irrigation contact time (38). On the basis of the findings of this study, it appears that high concentration and long exposure to NaOCl are needed for elimination of E. faecalis contaminated dentin.…”

Comparison of Effects of ProTaper, HeroShaper, and Gates Glidden Burs on Cervical Dentin Thickness and Root Canal Volume by Using Multislice Computed Tomography

“…Therefore, Flex-R files are considered safe to prepare curved canals with balanced-force technique because it showed less volume of dentin removal. Also Matwychuk et al (36) found that there was no difference in terms of canal transportation and working length changes between root canals instrumented with the Liberator (Miltex Inc), the Sequence (Brasseler USA, Savannah, GA) Ni-Ti rotary systems, or Flex-R stainless steel hand instruments when used in balanced-force technique to prepare curved mesiobuccal canals of mandibular molar.…”

Distortion and Breakage of Liberator, EndoSequence, and ProFile Systems in Severely Curved Roots of Molars

“…The manufacturer (10) claims that this design will decrease the chances of file separation by preventing friction and self-threading into the canal; the high rotational speed (1,000-2,000 rpm) will reduce the torque forces responsible for file separation; and the electrochemical grinding process used to treat these files will eliminate transverse microcracks, decreasing the likelihood of fracture. A recent study (11) reported a separation rate of 8% for the Liberator NiTi files when used in shaping of the mesiobuccal canals of extracted mandibular molars. More information is needed with regard to the distortion and separation rates to be expected when Liberator files are used to prepare the root canal system.…”