A Consensus-Based Glossary for Controversial Terminology in Root and Canal Anatomy.

AIM: To produce a glossary of controversial terminology relating to a variety of anatomical features of root canals. MATERIALS AND METHODS: A multi-stage consensus process was designed and applied to generate definitions for controversial terms describing root and canal anatomy. The overall direction of the project was provided by an Executive Group, whereas a separate Task & Finish Group was convened to compile a preliminary list of controversial terms together with proposed definitions. This draft was then circulated to an international panel of 32 experts, who took part in an anonymous, web-based Delphi exercise to give independent feedback. Findings from this Delphi round were subsequently examined and debated during a virtual meeting. RESULTS: Following the Delphi exercise, 14 of the 15 proposed terms achieved the pre-specified consensus threshold, with more than 70% of respondents rating them above 7. Consensus was not initially reached for the remaining term ('furcation accessory canal'); its definition was subsequently amended and put through a further Delphi round, after which agreement was achieved. A follow-up virtual meeting involving 19 experts reviewed the Delphi outcomes and proposed further refinements. In response, the Executive Group and Task & Finish Group prepared the final version of the glossary. CONCLUSION: Through a rigorous, structured process of international expert consensus, a glossary addressing controversial terminology in root and canal anatomy has been established. This resource offers a dependable basis for consistent, standardised terminology going forward, with relevance across clinical practice, teaching and research.