CBCT Assessment of Root Dentine Removal by Gates-Glidden Drills and Two Engine-Driven Root Preparation Systems.
BACKGROUND
The aim of this study was to compare the dentine removing efficacy of Gates-Glidden drills with hand files, ProTaper and OneShape single-instrument system using cone-beam computed tomography (CBCT).


METHODS
A total of 39 extracted bifurcated maxillary first premolars were divided into 3 groups (n=13) and were prepared using either Gates-Glidden drills and hand instruments, ProTaper and OneShape systems. Pre- and post-instrumentation CBCT images were obtained. The dentin thickness of canals was measured at furcation, and 1 and 2 mm from the furcation area in buccal, palatal, mesial and distal walls. Data were analyzed using one-way ANOVA test. Tukey's post hoc tests were used for two-by-two comparisons.


RESULTS
Gates-Glidden drills with hand files removed significantly more (P<0.001) dentine than the engine-driven systems in all canal walls (buccal, palatal, mesial and distal). There were no significant differences between OneShape and ProTaper rotary systems (P>0.05).


CONCLUSIONS
The total cervical dentine removal during canal instrumentation was significantly less with engine-driven file systems compared to Gates-Glidden drills. There were no significant differences between residual dentine thicknesses left between the various canal walls.
Dental Material Research Center, Department of Endodontics, Dental School, Babol University of Medical Sciences, Babol, Iran.
Azade
A
Harandi
Student Research Committee, Dental School, Babol University of Medical Sciences, Babol, Iran.
Fatemeh
F
Mohammadpour Maleki
Dental Material Research Center, Department of Radiology, Dental School, Babol University of Medical Sciences, Babol, Iran.
Ehsan
E
Moudi
Dental Material Research Center, Department of Endodontics, Dental School, Babol University of Medical Sciences, Babol, Iran.
Maryam
M
Ehsani
Department of Social Medicine and Health, Dental School, Babol University of Medical Sciences, Babol, Iran.
Soraya
S
Khafri
Cone-Beam Computed Tomography; Maxillary First Premolar; Root Canal Preparation; Root Thickness