A comparison of Mtwo rotary file with K-file on negotiation of second mesiobuccal canal in maxillary first molar: A clinical study

This study was carried out to compare the capability of K-files with Mtwo rotary file in terms of negotiation as well as depth of penetration in second mesiobuccal (MB2) canal of maxillary first molar. A total of 32 MB2 canal of maxillary first molars having different root curvatures (not more than 30 degree) and root lengths were selected and then detected by K-file #10, #8 and #6. Based upon file penetration the samples were assigned into four groups. Group A: K-file #10 penetrate>2mm into coronal third, group B: K-file #10 could penetrate2mm penetration, group C: K-files #10 and 8 could penetrate ≤0.01). Mtwo rotary files could be an efficient substitute for hand files to negotiate MB2 canal both more easily and rapidly. To our knowledge, it is the first time that a NiTi rotary file showed success in negotiation of any canal.