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Count Me in, Count Me out: Regulation of the Tooth Number via Three Directional Developmental Patterns

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MDPI
DOI: 10.3390/ijms242015061

关键词

tooth number; tooth agenesis; supernumerary tooth; deciduous tooth; permanent tooth; diphyodonts; dental lamina; continual lamina; successional lamina

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Tooth number anomalies are common congenital dental problems, and the precise number of teeth is crucial for proper function and aesthetics. This article proposes a regulatory network for tooth number based on the dentition formation process and summarizes recent studies on early tooth development.
Tooth number anomalies, including hyperdontia and hypodontia, are common congenital dental problems in the dental clinic. The precise number of teeth in a dentition is essential for proper speech, mastication, and aesthetics. Teeth are ectodermal organs that develop from the interaction of a thickened epithelium (dental placode) with the neural-crest-derived ectomesenchyme. There is extensive histological, molecular, and genetic evidence regarding how the tooth number is regulated in this serial process, but there is currently no universal classification for tooth number abnormalities. In this review, we propose a novel regulatory network for the tooth number based on the inherent dentition formation process. This network includes three intuitive directions: the development of a single tooth, the formation of a single dentition with elongation of the continual lamina, and tooth replacement with the development of the successional lamina. This article summarizes recent reports on early tooth development and provides an analytical framework to classify future relevant experiments.

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