The assessment of root canal curvature is essential for clinical and research purposes.
This systematic review presents an overview of the published techniques for the measurement
of root canal curvature features using imaging and to provide a critique of their
clinical application. A database search in PubMed, PubMed Central, Embase, Scopus,
EBSCO Dentistry & Oral Sciences Source and Virtual Health Library was conducted, using
appropriate key words to identify measurement methods for root canal curvatures. The
search strategy retrieved 10594 records in total, and 31 records fulfilled the inclusion
criteria. From 2D image acquisitions, eleven studies measured exclusively the angle
of curvature, an additional thirteen measured other curvature features (level, height,
radius, length and shape). Seven reports described methods from 3D imaging (CBCT,
CT). Root canal curvatures should be measured, for clinical proposes, to facilitate
endodontic treatment planning, and in research, to reduce the risk of selection bias.
This review has revealed that there are many methods described in the literature;
however, no consensus exists on which method should be used. Some of the methodologies
have potential clinical translation, whereas others are suitable for research purpose
only, as they require a specific software or radiographic exposure in the mesiodistal