This randomized controlled clinical trial aims to evaluate the effect of the number of rotary files on working length negotiation and postoperative pain in the second mesiobuccal (MB2) canals of maxillary first molars. Patients are assigned to one of four groups according to the number of rotary files used: single-, two-, three-, or four-file systems. Postoperative pain is assessed on each of the seven consecutive postoperative days (Days 1-7) using a visual analog scale (VAS), and working length negotiation success is recorded during canal instrumentation.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
152
A single-file NiTi system (25/.04) operated at 300 rpm and 2.5 Ncm torque. Applied directly to the MB2 canal without prior hand instrumentation.
Two-file system using 10/.06 Shaper for coronal/middle thirds and 25/.04 Finisher for apical third. Operated at 300 rpm and 2.0-2.5 Ncm torque.
Three-file NiTi rotary system (15/.04, 20/.05, 25/.04) used sequentially for coronal, middle, and apical thirds. Applied with brushing-pecking motion in 2-3 mm increments under continuous irrigation. Operated at 300 rpm and 1.8 Ncm torque.
NiTi rotary file system including 10/.07 Opener, 10/.04, 17/.05, and 25/.04 files. Used in crown-down sequence with rpm and torque settings ranging from 250-300 rpm and 2.0-2.5 Ncm. Brushing-pecking motion and continuous irrigation were applied during instrumentation.
Hatay Mustafa Kemal University Faculty of Dentistry
Antakya, Hatay, Turkey (Türkiye)
RECRUITINGPostoperative Pain Intensity (VAS Score)
Postoperative pain will be assessed using a 100-mm Visual Analog Scale (VAS), where 0 mm represents "no pain" and 100 mm represents "worst possible pain imaginable."
Time frame: Daily assessment for 7 consecutive days following treatment (Days 1-7)
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