Evaluation of Remaining Dentin Thickness After Manual and Evaluation of Remaining Dentin Thickness After Manual and Rotary Instrumentation In Primary Molars Using Cone Beam Rotary Instrumentation In Primary Molars Using Cone Beam Computed Tomography. (An In-Vitro Study)

Abstract

Aim: To compare the radicular dentin thickness before and after instrumentation by manual stainless-steel (K-files) versus rotary files (AF™ Baby File) at coronal, middle, and apical thirds using Cone Beam Computed Tomography (CBCT). Materials and Methods: Forty roots of extracted mandibular primary molars were collected, and randomly and equally divided into 2 groups. Manual Group was prepared by K-files, and Rotary Group was prepared by rotary AF™ Baby File system. Samples were decapitated and stabilized in epoxy resin blocks. Samples were subjected to CBCT scan before and after instrumentation for radicular dentin thickness evaluation at 3 measuring points; apical, middle, and coronal. Results: An average amount of dentin removed was found to be significantly higher in Manual Group compared to Rotary Group in the 3 measuring points (P <0.005). Conclusion: Rotary files can be considered more preferable than manual files in terms of preservation of radicular dentin thickness after root canal instrumentation, therefore rotary files can be a suitable substitute for conventional SS manual files

Cone-beam computed tomography evaluation of shaping ability of kedo-S square and fanta AF™ baby rotary files compared to manual K-files in root canal preparation of primary anterior teeth

“…Whereas a significant difference in the middle third was found between the same groups with less amount of dentin removed in the Fanta AF™ Baby group; this may be attributed to less flexible stainless-steel K-files that can force against the dentinal walls laterally and effectively remove more dentin [ 34 ], contrasted to controlled memory (CM) wires technology of Fanta AF™ Baby files that easily adapt to diverse canals morphology without straightening [ 10 ]. This agreed with Eldemery et al [ 30 ] who found that the K-file group had a higher amount of dentin removed than the Fanta AF™ Baby group at all levels of the root canal with a highly significant difference. Also, Kummer et al [ 13 ] revealed that K-file instrumentation removed more dentin than rotary instrumentation (Hero 642).…”

“…In the current study, the greatest amount of dentin removed was noticed in the Fanta AF™ Baby group at the cervical and apical thirds among the study groups; this may be attributed to the constant file taper (0.04 ISO) along the entire file length also, the total number of files used in the instrumentation procedures [ 30 ]. A non-significant difference was found between Fanta AF™ Baby and K-file groups at cervical and apical third with a great amount of dentin removed in both groups; this may be linked to the total file number of Fanta AF™ Baby (four files) and K-files (six files) used during the root canal preparation.…”

“…This variable taper design serves to minimize file contact with the root canal while increasing its effectiveness and is more conservative than a fixed taper [ 29 ]. The remaining radicular dentin might be the most significant iatrogenic factor that affects the root’s ability to resist fracture; the least remaining dentin thickness of the canal walls should be 0.3 mm to provide adequate protection from occlusal and lateral forces [ 30 ]. Particularly in primary teeth, the tooth exfoliates more rapidly when the thickness of the remaining dentin decreases [ 31 ].…”

“…A non-significant difference was found between Fanta AF™ Baby and K-file groups at cervical and apical third with a great amount of dentin removed in both groups; this may be linked to the total file number of Fanta AF™ Baby (four files) and K-files (six files) used during the root canal preparation. Also, the constant taper of both files (0.04 ISO of the Fanta AF™ Baby file system and 2% of K-file) along the entire file length [ 30 ]. Whereas a significant difference in the middle third was found between the same groups with less amount of dentin removed in the Fanta AF™ Baby group; this may be attributed to less flexible stainless-steel K-files that can force against the dentinal walls laterally and effectively remove more dentin [ 34 ], contrasted to controlled memory (CM) wires technology of Fanta AF™ Baby files that easily adapt to diverse canals morphology without straightening [ 10 ].…”

Assessment of clinical and radiographic efficiency of manual and pediatric rotary file systems in primary root canal preparation: a randomized controlled clinical trial

“…These files conform to the root canal shape and don’t totally straighten through curved canal instrumentation. Fanta AF ™ Baby file has a triangular cross-section with16 mm working length that reduces the stress by minimizing contact between the file & dentin [ 15 ].…”