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The “sand watch” mandible
, 12, 34, 5
Affiliations- Division of Anatomy, Faculty of Dental Medicine, “Carol Davila” University of Medicine and Pharmacy, Bucharest, Romania
- “Carol Davila” Central Military Emergency University Hospital, Bucharest, Romania
- Faculty of Dental Medicine, “Carol Davila” University of Medicine and Pharmacy, Bucharest, Romania
- Division of Restorative Odontotherapy, Bucharest, Romania
- Division of Implant Prosthetic Therapy, Faculty of Dental Medicine, “Carol Davila” University of Medicine and Pharmacy, Bucharest, Romania
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Abstract
The lingual surface of the mandible’s body is commonly indicated as presenting the submandibular and sublingual fossae, which are separated by the mylohyoid line. The mylohyoid line attaches to the mylohyoid muscle (MM). Less attention has been paid to the ‘mylohyoid boutonnières’, which allow the ‘sublingual buttons’ to pass through the mylohyoid muscle in the submandibular space. The cone-beam computed tomography files of patients were routinely examined for anatomical studies. Two cases were found with unexpected morphologies of the mandible’s body — the mylohyoid lines were incomplete anteriorly, and herniated sublingual tissue determined an additional fossa inferior to that line in the premolar region. That fossa was termed the ‘accessory submandibular fossa’. It determined on coronal slices a ‘sand watch’ contour of the mandible’s body. With such a peculiar morphology, the mandible is more prone to fracture. Moreover, when inserting endosseous implants, the procedure should be carefully personalised in such rare cases.
Abstract
The lingual surface of the mandible’s body is commonly indicated as presenting the submandibular and sublingual fossae, which are separated by the mylohyoid line. The mylohyoid line attaches to the mylohyoid muscle (MM). Less attention has been paid to the ‘mylohyoid boutonnières’, which allow the ‘sublingual buttons’ to pass through the mylohyoid muscle in the submandibular space. The cone-beam computed tomography files of patients were routinely examined for anatomical studies. Two cases were found with unexpected morphologies of the mandible’s body — the mylohyoid lines were incomplete anteriorly, and herniated sublingual tissue determined an additional fossa inferior to that line in the premolar region. That fossa was termed the ‘accessory submandibular fossa’. It determined on coronal slices a ‘sand watch’ contour of the mandible’s body. With such a peculiar morphology, the mandible is more prone to fracture. Moreover, when inserting endosseous implants, the procedure should be carefully personalised in such rare cases.
Keywords
mandible, cone-beam computed tomography, mental foramen, premolar teeth, sublingual fossa, endosseous implants
About this articleTitle
The “sand watch” mandible
Journal
Issue
Article type
Case report
Pages
424-428
Published online
2022-01-31
Page views
2696
Article views/downloads
1521
DOI
Pubmed
Bibliographic record
Folia Morphol 2023;82(2):424-428.
Keywords
mandible
cone-beam computed tomography
mental foramen
premolar teeth
sublingual fossa
endosseous implants
Authors
M. C. Rusu
M. D. Stoenescu
M. Butucescu
M. Săndulescu
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