ANATOMY

Detailed explanation-1: -The cementum overlaps the enamel for a short distance. This is seen in 60% of all teeth. This type of overlapping occurs when the enamel epithelium degenerates at the cervical region thereby allowing the connective tissue consisting of cementoblasts to contact the enamel directly.

Detailed explanation-2: -The teeth evaluated showed the 4 CEJ types. Type 3 was the most prevalent, being present, either alone or in combination, in 90.79% of the samples, followed by type 4 (present in 31.58% of the samples).

Detailed explanation-3: -The most common relationship (65%) is an overlapping of the cervical margin of enamel by the cementum. The second most common (25%) is a touching of the enamel margin with the end of the cementum. In the third relationship (10%), dentin is exposed in a gapping fashion.

Detailed explanation-4: -There are three distinct relationships at the cervical region of the tooth: a gap junction is when the cementum and enamel fail to connect, an edge-to-edge when the cementum and enamel meet and an overlay when the cementum extends on to the enamel.

Detailed explanation-5: -Cementum is limited to the roots of teeth. In 60% of cases, cementum is formed on the cervical enamel for a short distance; in 30% it stops at the cervical line just meet-ing the enamel; and in 10% a small gap exists between them. This order of frequency is known as overlap, meet, and gap (OMG) (Fig.