D

Freeze-fracture and ultrastructural studies show that mature odontoblasts form a complete junctional complex composed of adherens (zonula adherens) junctions, gap junctions for intercellular communication, and tight junctions (zonula occludens) at their distal ends toward predentin, therefore all three types are present in the odontoblastic layer [Callé, 1985, PMID 4013648; Arana-Chavez, 1997, PMID 9214550].