Cone Beam Computed Tomographic Evaluation of Remaining Dentine Thickness in the Danger Zone after Using Different Rotary File Systems

Mansy, Hanaa Sayed; Sobhy, Sabah Morad; Hassan, Eman Mohammed

doi:10.21608/asdj.2025.338622.1662

Cone Beam Computed Tomographic Evaluation of Remaining Dentine Thickness in the Danger Zone after Using Different Rotary File Systems

Document Type : Original articles

Authors

¹ Lecturer of Oral and Maxillofacial Radiology, Faculty of Dentistry, Cairo University, Egypt

² Lecturer of Endodontics, Faculty of Dental Medicine for Girls, Al-Azhar University, Cairo, Egypt

³ Lecturer in Oral Medicine, Periodontology, Diagnosis and Radiology department, Faculty of Dental Medicine for Girls, Al-Azhar University, Cairo, Egypt.

10.21608/asdj.2025.338622.1662

Abstract

A
Aim: The research was pointed to assess the remaining dentine in the danger zone in mandibular molars following the preparation of root canal with ProTaper Next, Videya N and Twisted File Adaptive systems using cone beam computed tomography.
Materials and methods: Forty-eight mandibular molars were selected for the study. After access cavity preparation and pre-instrumentation CBCT scanning, the teeth were randomly assigned to three groups (16 teeth each) based on the file system used: ProTaper Next, Videya N, and TF Adaptive. Following instrumentation, CBCT scanning was performed using standardized exposure parameters. Measurements of the danger zone dentin thickness were taken before and after using the file systems at 4 mm, 5 mm, and 6 mm below the orifice. The amount of dentin removed was calculated by subtracting the post-instrumentation measurements from the pre-instrumentation measurements. Statistical analysis of the collected data was performed using one-way ANOVA test (p >0.05).
Results: A statistical significance was found between the examined grouping in the residual dentin thickness and removed dentin at any level under the canal orifice.
Conclusion: The mesibuccal root canals of mandibular molar were effectively and safely prepared in the danger zone by the used file systems.

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