Conclusions The results of this systematic review suggested that NiTi rotary instruments were associated with lower canal transportation and apical extrusion when compared to SST h and files , whereas both groups had similar outcomes in terms of success of therapy , amount of residual bacteria , and cleansing ability after treatment .
Introduction This systematic review evaluated the effectiveness of  nickel‐titanium ( NiTi ) rotary files compared to stainless‐steel ( SST ) h and files .
A prospective study of the factors affecting outcomes of nonsurgical root canal treatment: part 1: periapical health.
AIM To investigate the probability of and factors influencing periapical status of teeth following primary ( 1 ° RCT x ) or secondary ( 2 ° RCT x ) root canal treatment .  METHODOLOGY This prospect i ve study involved annual clinical and radiographic follow-up of  1 ° RCT x ( 1170 roots , 702 teeth and 534 patients ) or 2 ° RCT x ( 1314 roots , 750 teeth and 559 patients ) carried out by Endodontic postgraduate students for 2 - 4 ( 50 % ) years . Pre- , intra- and postoperative data were collected prospect ively on customized forms . The proportion of roots with complete periapical healing was estimated , and prognostic factors were investigated using multiple logistic regression models . Clustering effects within patients were adjusted in all models using robust st and ard error . RESULTS proportion of roots with complete periapical healing after 1 ° RCT x ( 83 % ; 95 % CI : 81 % , 85 % ) or 2 ° RCT x ( 80 % ; 95 % CI : 78 % , 82 % ) were similar . Eleven prognostic factors were identified . The conditions that were found to improve periapical healing significantly were : the preoperative absence of a periapical lesion ( P = 0.003 ) ; in presence of a periapical lesion , the smaller its size ( P ≤ 0.001 ) , the better the treatment prognosis ; the absence of a preoperative sinus tract ( P = 0.001 ) ; achievement of patency at the canal terminus ( P = 0.001 ) ; extension of canal cleaning as close as possible to its apical terminus ( P = 0.001 ) ; the use of ethylene-diamine-tetra-acetic acid ( EDTA ) solution as a penultimate wash followed by final rinse with NaOCl solution in 2 ° RCT x cases ( P = 0.002 ) ; abstaining from using 2 % chlorexidine as an adjunct irrigant to NaOCl solution ( P = 0.01 ) ; absence of tooth/root perforation ( P = 0.06 ) ; absence of interappointment flare-up ( pain or swelling ) ( P = 0.002 ) ; absence of root-filling extrusion ( P ≤ 0.001 ) ; and presence of a satisfactory coronal restoration ( P ≤ 0.001 ) . CONCLUSIONS Success based on periapical health associated with roots following 1 ° RCT x ( 83 % ) or 2 ° RCT x ( 80 % ) was similar , with 10 factors having a common effect on both , whilst the 11th factor ' EDTA as an additional irrigant ' had different effects on the two treatments
Conclusions The results of this systematic review suggested that NiTi rotary instruments were associated with lower canal transportation and apical extrusion when compared to SST h and files , whereas both groups had similar outcomes in terms of success of therapy , amount of residual bacteria , and cleansing ability after treatment .
Introduction This systematic review evaluated the effectiveness of  nickel‐titanium ( NiTi ) rotary files compared to stainless‐steel ( SST ) h and files .