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Cemento-enamel junction-revisited

1988; Wiley; Volume: 23; Issue: 1 Linguagem: Inglês

10.1111/j.1600-0765.1988.tb01027.x

1600-0765

Hubert E. Schroeder, W Scherle,

Bone and Dental Protein Studies

The cemento‐enamel junction (CEJ) of human teeth has been studied very infrequently and on the basis of ground sections only. A total of 30 human teeth (incisors, premolars, molars) was prepared for examination with the scanning electron microscope (SEM). A selection of freshly erupted first premolars (n=8) and third molars (n=8) served for a quantitative determination of the entire, as well as the site‐specific (buccal, distal, oral and mesial aspects), length of the CEJ and of the respective extension of the 3 hard tissue relationships along the CEJ. In addition, 4 third molars were used to examine the CEJ in ground sections, using both the light‐ and the scanning electron microscope. In first premolars, most of the CEJ revealed edge‐to‐edge contact of cementum and enamel, while in 17 (maxillary premolars) to 31% (mandibular premolars) of the CEJ cementum overlapped the enamel. In third molars, cementum overlap occurred in about 50% of the CEJ, the rest showing either edge‐to‐edge contact of cementum and enamel or exposed dentine. In molars, the type and extension of these relationships changed from buccal‐to‐distal to oral‐to‐mesial aspects. Because of an unpredictable variation in these relationships over short distances, examination of ground sections may fail to correctly identify the CEJ‐structure.