Radix Entomolaris / Radix Paramolaris

The radix entomolaris is an additional root in human's mandibular molar teeth. The human mandibular teeth have two roots usually. In rare cases, however, a root may develop between the distal and the mesial roots which is called entomolaris, if it is located lingual to the tooth.

Such a phenomenon is named radix paramolaris in case an extra root is buccal to a molar tooth. It is important to remember that an extra root can appear both in the first and second molars.

Three roots on mandibular molar, radix entomolaris

Radix entomolaris on a mandibular left first molar

Mandibular molar three roots, Radix Entomolaris

Radix entomolaris, apical view