Scanning electron microscopic observations of fibrous structure of cemento-dentinal junction in healthy teeth.

Introduction: The cemento‑dentinal junction (CDJ) is a structural and biologic link between cementum and dentin present in the roots of teeth. Conflicting reports about the origin, structure and composition of this layer are present in literature. The width of this junctional tissue is reported to be about 2‑4 µm with adhesion of cementum and dentin by proteoglycans and by collagen fiber intermingling. Aim and Objective: The objective of this study is to observe and report the fibrous architecture of the CDJ of healthy tooth roots. Materials and Methods: A total of 15 healthy teeth samples were collected, sectioned into halves, demineralized in 5% ethylenediaminetetraacetic acid, processed using NaOH maceration technique and observed under a scanning electron microscope. Results: The CDJ appeared to be a fibril poor groove with a width of 2-4 μm. Few areas of collagen fiber intermingling could be appreciated. A detailed observation of these tissues has been presented.