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Variations in the Number of Teeth

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Anatomical Variations in Clinical Dentistry

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Abstract

There are two main congenital anomalies of human tooth number: hyperdontia and congenitally missing teeth. Hyperdontia is the condition of having more teeth than the normal set (28, excluding third molars); congenitally missing teeth means fewer teeth than normal. Both conditions can appear as isolated traits or associated with syndromes such as ectodermal dysplasia. Tooth number variations can have negative aesthetic and functional effects such as malocclusion, periodontal injury, impaired alveolar bone growth, reduced chewing efficiency, and speaking problems. Patients who have tooth number irregularities need more dental attention, so these conditions are interesting not only for dentists but also for public health departments and health insurance companies.

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Authors and Affiliations

  1. University of Florida, Gainesville, FL, USA

    Tsuyoshi Tanaka

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  1. Tsuyoshi Tanaka
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Editors and Affiliations

  1. Seattle Science Foundation, Seattle, WA, USA

    Joe Iwanaga

  2. Seattle Science Foundation, Seattle, WA, USA

    R. Shane Tubbs

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Tanaka, T. (2019). Variations in the Number of Teeth. In: Iwanaga, J., Tubbs, R. (eds) Anatomical Variations in Clinical Dentistry. Springer, Cham. https://doi.org/10.1007/978-3-319-97961-8_19

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  • DOI: https://doi.org/10.1007/978-3-319-97961-8_19

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-97960-1

  • Online ISBN: 978-3-319-97961-8

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