title: Modifications in Canal Anatomy of Curved Canals of Mandibular First Molars by two Glide Path Instruments using CBCT.
abstract: BACKGROUND
  The creation of glide path reduces the risk of instrument breakage. Glide path is created before using NiTi rotary instrumentation Aim: This study compared the changes in the root canal anatomy after creation of glide path using Path Files (PF) and V Glide Path 2 (VGP2) using Cone Beam Computed Tomography (CBCT).
  
  
  METHODS
  Hundred extracted mandibular first molars with curved mesial roots, curvature angles ranging within 20-30 degrees were assigned into two groups (n = 50 each). Glide path was prepared using PF (Group I) and VGP2 (Group II). CBCT images were obtained before and after instrumentation. The technical outcomes were compared at 0, 1, 2, 3, 5 and 7mm intervals. The data was analyzed using t-test and Chi-square test.
  
  
  RESULTS
  There was a statistical difference between the root canal curvatures and working time between the two groups (p < 0.05). Canals transported towards the distal side in Group II but there was a slight mesial transportation in Group I at 0mm. Group I exhibited a better centric ability except at 1mm interval (p > 0.05). The changes in the volume were statistically significant only at 2mm interval (p < 0.05). The difference in the cross sectional area was not statistically significant at any interval (p > 0.05).
  
  
  CONCLUSIONS
  Within the limits of this study the rotary Nickel Titanium Path Files appeared to be suitable instruments for safe and easy creation of glide path.
authors.affiliation: Professor & Head, Department of Endodontics, D.J.College of Dental Sciences & Research , Modinagar, U.P., India .
authors.forename: Anil
authors.initials: A
authors.lastname: Dhingra
authors.affiliation: Post Graduate, Department of Endodontics, D.J.College of Dental Sciences & Research , Modinagar, U.P., India .
authors.forename: Nayasha
authors.initials: N
authors.lastname: Manchanda
keywords: Nickel Titanium; Root canal; root canal preparation