[Growth and development of the dental arch, alveolar ridge and palate on the anterior segment during deciduous dentition (author's transl)].
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A specimen of juvenile gorilla was found that had the premaxillary-maxillary suture coursing between the lateral deciduous incisor and deciduous canine on one side of the jaw, but between the central and lateral deciduous incisors on the other; in the latter, the suture also separates the alveolus of the lateral deciduous incisor from the crypt of the growing successional lateral incisor. Rather than dismiss this exception to the traditional dictum of tooth identification--which is based on the position to teeth relative to this suture--as some inconsequential anomaly, an attempt is made to understand how this can occur within the confines of present understanding of dentofacial growth and development and developmental theory. An hypothesis relating tooth and tooth class identification is presented in the context of ectomesenchymally predifferentiated stem progenitors and subsequent tooth class proliferation.
Dental Pulp is a soft gelatinous, living cellular tissue of ectomesenchymal origin having various functions, residing within bilayered hard mineralized structures like enamel, dentin and cementum. Hertwigs epithelial root sheath initiates the formation of size, shape and number of radicular pulp. Deciduous pulp cavities differ from permanent teeth present study was conducted to find out number of root canals and their pattern, in deciduous teeth.
Double anomalies of the lower lateral anterior deciduous teeth of three siblings were studied clinically and radiographically. In one case, the double anomalies were demonstrable in the permanent tooth germs. Various differentiation stages of schizodontia were observed. Apparently, the anomalies were genetically determined in the three cases. Effects on the change of teeth as well as anomalies in the shape and number of the permanent teeth were reported.
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