Investigating the Prevalence of Radix Entomolaris Root in Mandibular First Molars Using Cone Beam Computed Tomography among the Patients Referring to Radiology Centers in the Northwest of Tehran

Teeth are morphologically and genetically different in various races and cities. Hence, determining the frequency of radix entomolaris root in different races is of critical importance. The main purpose of this survey is to appraise the frequency of radix entomolaris root in mandibular first molars using cone beam computed tomography (CBCT) approach.

TThis is an observational and descriptive research to survey the presence of radix entomolaris root in lower first molars among patients referring to radiology centers in the northwest of Tehran. We studied 2000 records coupled with the CBCT images. 389 records with one or both left and right molars were extracted. The results were evaluated with respect to the presence of radix entomolaris root on the left, right or both sides. The data were analyzed using the Chi-square test.

The radix entomolaris root was observed in 3.3% of patients and 2.8% of the studied teeth. There is no significant relationship between gender and the frequency of the third root in mandibular first molars (p value = 0.07). No significant relationship was observed between the frequency of radix entomolaris root and the side of occurrence (p value = 0.76). All identified cases of radix entomolaris root were distolingual and no mesiobuccal root was observed.

There is no association between gender and the frequency of the third root in mandibular first molars as well as the position and frequency of the radix root, The variation in root abundance of radix entomolaris is mainly influenced by racial differences.