Analysis of the Morpho-Geometrical Changes of the Root Canal System Produced by TF Adaptive vs. BioRace: A Micro-Computed Tomography Study

Abstract

We aimed to analyze the morpho-geometric changes of the root canal system created by two rotary systems (TF Adaptive and BioRace) using micro-CT technology. Two concepts of rotary file system kinematics, continuous rotation and adaptive kinematics, were used in root canal preparation. Twenty mandibular molars (n = 20) were selected with the following criteria: the teeth have mesial roots with a single and continuous isthmus connecting the mesiobuccal and mesiolingual canals (Vertucci’s Type I configuration) and distal roots with independent canals. Teeth were scanned at a resolution of 14 μm. Canals were divided equally into two groups and then enlarged sequentially using the BioRace system and TF Adaptive system according to manufacturer protocol. Co-registered images, before and after preparation, were evaluated for morphometric measurements of canal surface area, volume, structure model index, thickness, straightening, and un-instrumented surface area. Before and after preparation, data were statistically analyzed using a paired sample t-test. After preparation, data were analyzed using an unpaired sample test. The preparation by both systems significantly changed canal surface area, volume, structure model index, and thickness in both systems. There were no significant differences between instrument types with respect to these parameters (p > 0.05). TF Adaptive was associated with less straightening (8% compared with 17% for BioRace in the mesial canal, p > 0.05). Both instrumentation systems produced canal preparations with adequate geometrical changes. BioRace straightened the mesial canals more than TF Adaptive.

Characterization of the differential efficacy of austenitic vs martensitic NiTi rotary files in non-surgical root canal retreatment: a micro-CT analysis

“…Micro-computed tomography (µ-CT) has been suggested for assessing the tomography of canal walls, as it is a non-destructive technique, which provides accurate three-dimensional reproduction of the tooth without destructive sectioning of the specimens or loss of the root ma- terial during sectioning [42]. It also allows superior preoperative and postoperative evaluation of the morphological changes in the root canal trajectory for better assessment of root curvatures and canal transportation [43].…”

“…In other parts of this study, the morpho geometric changes in the root canals were observed. The shaping ability of rotary files can be affected by several factors, such as instrument design (cross-section, taper, size, and the number of flutes), motion kinematics (reciprocation, adaptive rotation, continuous rotation, or oscillation), and the number of instruments used [43,[51][52][53]. In this study, all these variables were standardized except for file metallurgy between OC (martensitic) and OS (austenitic).…”

Advanced Materials for Oral Application

“…NiTi rotary files may undergo fatigue; novel manufacturing technologies such as reciprocating files or active cutting regions are aimed to overcome this deficiency. Alsofi et al [ 14 ], in the article “Analysis of the Morpho-Geometrical Changes of the Root Canal System Produced by TF Adaptive vs. BioRace: A Micro-Computed Tomography Study”, aimed to evaluate and compare, using an ex vivo model, the shaping ability of adaptive reciprocation kinematics and continuous rotation instrumentation movement using TF Adaptive files and BioRace files, respectively. The conclusion was that both rotary systems produced canal preparations with adequate geometrical changes, but none of them could touch all the canal walls [ 14 ].…”