Interrelationships in the Variability of Root Canal Anatomy among the Permanent Teeth: A Full-Mouth Approach by Cone-Beam CT

<div><p>Objectives</p><p>In endodontic practice, clinicians should be aware of possible root canal anatomic variations. The aim of this study was to assess using CBCT acquisitions regarding whether one root canal anatomy of a tooth is associated with a specific anatomy of another tooth.</p><p>Methods</p><p>A total of 106 CBCT acquisitions were obtained using a CBCT scanner with 200μm voxel size. Numbers of roots and canals of the entire dentition were described. Bivariate analyses and logistic regressions were conducted to explore root canal anatomy on one tooth according to age, gender, jaw, side and the others teeth. Multiple correspondence analysis (MCA) was performed to correlate the different numbers of canals profiles.</p><p>Results</p><p>A total of 2424 teeth were analyzed. Independently from the other variables, the presence of an additional root canal on a mandibular incisor increases the risk of having an additional root canal on a mandibular premolar (OR _[95%] 3.7 [1.0;13.2]). The mandibular molar variability increases in women compared to men (OR _[95%] 0.4 [0.1; 0.9]). MCA showed correspondence between 2-canals maxillary incisor and canines and 5-canals maxillary molars, and some correlation between additional canal on maxillary and mandibular premolars.</p><p>Conclusions</p><p>Although CBCT examinations are conducted in the first intention of making a diagnosis or prognostic evaluation, medium FOV acquisitions could be used as an initial database thus furnishing preliminary evaluations and information. In endodontic practice, clinicians should be aware of possible root canal anatomic variations. The visualization of all canals is considered essential in endodontic therapy. The use of multi-correspondence analysis for statistics in endodontic research is a new approach as a prognostic tool.</p></div

Description of study population.

<p>Description of study population.</p

Details about the number of canals and roots observed in the medium field of view cone-beam CT acquisitions.

<p>Details about the number of canals and roots observed in the medium field of view cone-beam CT acquisitions.</p

Multiple correspondence analysis MCA.

<p>When the tooth was absent, the number of canals was considered as a new category “s” to be included in the 102 observations analysis of the MCA.</p

Proportion of tooth groups which have at least a difference from the average dental anatomy presented in Table 2.

<p>Proportion of tooth groups which have at least a difference from the average dental anatomy presented in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0165329#pone.0165329.t002" target="_blank">Table 2</a>.</p

Results from logistic regression analysis (90 observations).

<p>Results from logistic regression analysis (90 observations).</p

The 20 July 2002 occultation of P126 by Pluto

International audienc

The 20 July 2002 occultation of P126 by Pluto

International audienc

The 20 July 2002 occultation of P126 by Pluto

International audienc