The enamel--dentine junction of human and Macaca irus teeth: a light and electron microscopic study.

The enamel--dentin junction of human and Macaca irus teeth has been studied using light and scanning and transmission electron microscopy. There are differences between species and within the same tooth. Scalloping, when present, is more developed in the cuspal areas and approximally, and the scallops appear to be formed at the time of maturation of the hard tissues. Enamel tufts and spindles are briefly discussed. The depth of scallops was less in the human deciduous than in the permanent teeth, but no differences were noted between monkey deciduous and permanent dentitions.