Morphology of the Cement-Enamel Junction (CEJ)

Cement ­ Enamel Junction is the anatomical boundary between enamel on tooth crown and the cement which covers the root of the tooth. (Franchischone, 2006; Franchischone & Consolaro, 2008). It is an important benchmark in clinical dentistry, because is the place where gingival fibers are attached to a tooth in a healthy state; so, it is the reference benchmark in order to assess periodontal destruction (Hu et al., 1983; Berendregt et al., 2009). Choquet (1899) was the first one to describe the relationship between enamel and cement at the UAC (CEJ), describing four types of relations between those tissues: 1) cement over enamel, 2) enamel over cement, 3) vis a vis, 4) Gap presence between enamel, cement and exposed dentin. 

This classification was named for his work, and has been studied for years using several methods including observation, light microscope (Arambawatta et al., 2009), scanning electron microscopy (Neuvald & Consolaro, 2000), and morphogenic and embryological analysis (Owens, 1976; Bosshardt & Schroeder, 1996).