Accuracy of micro hole negotiator and other techniques for detecting MB2 canals in maxillary molar retreatment: a prospective cohort study

Adıgüzel, Mehmet, Özeken, Furkan, Çapar, İsmail Davut, Arslan, Hakan and Dummer, Paul Michael Howell ORCID: https://orcid.org/0000-0002-0726-7467 2025. Accuracy of micro hole negotiator and other techniques for detecting MB2 canals in maxillary molar retreatment: a prospective cohort study. Australian Endodontic Journal 10.1111/aej.70043

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Abstract

This clinical study evaluated four diagnostic approaches for locating the orifice of the second mesiobuccal canal (MB2) during root canal retreatment of maxillary molars: direct visual inspection, the Micro Hole Negotiator electronic device, the dental operating microscope, and their combined use. A stepwise protocol was used in 124 retreatment cases, applying each method sequentially. Detection rates of MB2 canals increased progressively, with the combined use of the microscope and electronic device yielding the highest adjusted diagnostic efficiency, followed by the microscope alone, the electronic device alone, and direct visual inspection. These findings suggest that optical magnification and impedance-based electronic feedback can enhance canal identification, particularly under complex retreatment conditions. The electronic device outperformed direct visual inspection and may enhance the detection of MB2 canals in clinical settings where a microscope is unavailable.

Item Type:	Article
Date Type:	Published Online
Status:	In Press
Schools:	Schools > Dentistry
Publisher:	Wiley
ISSN:	1329-1947
Date of Acceptance:	21 November 2025
Last Modified:	08 Dec 2025 14:45
URI:	https://orca.cardiff.ac.uk/id/eprint/182982

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