Encyclopedia of Pathology

Living Edition
| Editors: J.H.J.M. van Krieken

Frictional Keratosis

Living reference work entry
DOI: https://doi.org/10.1007/978-3-319-28845-1_708-1



Frictional keratosis is a white, keratotic lesion due to chronic mechanical irritation caused by sharp edges of teeth or restorations, dental prosthesis, abrasive foods, vigorous tooth brushing, and playing wind instruments. Alveolar ridge keratosis is a frictional keratosis located on the edentulous alveolar ridge and/or retromolar pad. Morsicatio mucosae oris is a form of chronic oral frictional keratosis of the nonkeratinized oral mucosa, usually located on the buccal mucosa or lips.

Frictional keratosis presents as diffuse, white plaques, pale-translucent to dense, white, and irregular.

Clinical Features


Frictional keratosis is a common oral lesion due to trauma.


No age predilection.


No sex predilection.


Frictional keratosis occurs in areas that are commonly traumatized, such as the buccal mucosa (along the occlusal line), lips, lateral margins of the tongue, and edentulous alveolar ridges.


The lesion...

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References and Further Reading

  1. Chi, A. C., Lambert, P. R., Pan, Y., Li, R., Vo, D. T., Edwards, E., Gangarosa, P., & Neville, B. W. (2007). Is alveolar ridge keratosis a true leukoplakia? A clinicopathologic comparison of 2,153 lesions. Journal of the American Dental Association, 138, 641–651.CrossRefPubMedGoogle Scholar
  2. Woo, S. B., & Lin, D. (2009). Morsicatio mucosae oris: A chronic oral frictional keratosis, not a leukoplakia. Journal of Oral and Maxillofacial Surgery, 67, 140–146.CrossRefPubMedGoogle Scholar

Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.Department of PathologyThe Netherlands Cancer Institute, Antoni van Leeuwenhoek HospitalAmsterdamThe Netherlands