Abnormal dental root morphology Dental root fusion Fused dental root Root fusion may be formed either by the combining of roots because of cementum deposition with time or as a result of the failure of the Hertwig epithelial root sheath to develop or fuse in the furcation area, which is frequently found in maxillary and mandibular premolars and molars. In mandibular molars, root fusion usually presents as a C-shaped root, whereas in maxillary molars fused roots may show various root shapes, such as two or more roots being fused partially or completely. Unseparated dental root An anomaly of the roots of a multi-rooted tooth (such as a molar) in which the roots are not physically divided by bone or periodontal ligament space.