Prevalence of Middle Mesial Canals and Isthmi in the Mesial Root of Mandibular Molars: An In Vivo Cone-beam Computed Tomographic Study

Prevalence of Middle Mesial Canals in the Mesial Root of First Permanent Mandibular Molars in Egyptian Population: An Invivo Cohort Retrospective Cone-Beam Computed Tomographic Study

“…Forner et al (22) reported the existence of middle mesial canal was up to 14.8% in accordance with Akbarzadeh et al (23) who showed that the total prevalence of MM canal was 14.7%. While, Tahmasbi (24) found that 10.7% of their cases had MM canals originating from the cervical third. On the other hand, Azim et al (25) recognized the existence of combined true MM canals and isthmi as 46% in mandibular molars upon working under magnification after troughing in the mesial root within a 2-mm depth.…”

A micro‐computed tomographic study of band‐shaped root canal isthmuses, having their floor in the apical third of mesial roots of mandibular first molars

“…, Tahmasbi et al . ). Isthmuses, which are also termed as corridor or transverse anastomosis, are narrow communications between 2 root canals and contain pulp or pulp‐derived tissue (Green , Vertucci , Weller et al .…”

Cone-beam Computed Tomography Investigation of Middle Mesial Canals and Isthmuses in Mandibular First Molars in a Chinese Population

“…The report of Mehrnaz Tahmasbi [6] was used as a guide for establishing MM canal configurations. An isthmus was identified based on the presence of a thin ribbon-shaped communication between the ML and MB canals when inspected in the axial view.…”

“…Indeed, many approaches have been employed for assessing the presence of MM canals, with estimated frequencies from 0% to 46.2% [6][7][8]. Isthmus frequencies have been found to range from 20-70% [2,[9][10][11].…”

“…6 potential explanations for this finding. For one, MM canals are defined differently in various studies.For example, Mehrnaz Tahmasbi[6] defined MM canals as we did in the present study, identifying them based on the presence of a distinct round cross-sectional area in radiographic image located inbetween the MB and ML canals without regard for whether or not an isthmus was present. In other studies, however, MM canals were considered to be present if 3 canals were evident in the mesial roots.…”