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Related Experiment Videos

Weddellite in submandibular gland calculus.

H Yamamoto, T Sakae, M Takagi

    Journal of Dental Research
    |January 1, 1983
    PubMed
    Summary

    Scanning electron microscopy revealed tetragonal crystals on a submandibular sialolith. X-ray microdiffraction identified weddellite, but its origin within the calculus is unknown.

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    Area of Science:

    • Mineralogy
    • Biomineralization
    • Materials Science

    Background:

    • Sialoliths, or salivary stones, are calcifications that can obstruct salivary ducts.
    • Understanding the mineralogical composition of sialoliths is crucial for diagnosis and treatment.
    • Previous studies have identified various calcium phosphate and carbonate minerals in sialoliths.

    Purpose of the Study:

    • To characterize the crystal structure and mineral composition of a submandibular sialolith.
    • To investigate the crystal habits present on the surface of the sialolith.
    • To identify the specific mineral phase(s) present using advanced analytical techniques.

    Main Methods:

    • Scanning electron microscopy (SEM) was employed to examine the surface morphology and crystal habits.
    • X-ray microdiffraction (XRD) was utilized for precise mineral identification.
    • Crystals were analyzed for their crystallographic system and habit.

    Main Results:

    • SEM revealed octahedral and dipyramidal crystal habits on the sialolith's surface.
    • The observed crystal habits were consistent with a tetragonal crystal system.
    • X-ray microdiffraction definitively identified the mineral weddellite (calcium oxalate monohydrate).

    Conclusions:

    • The submandibular sialolith examined contained weddellite, a calcium oxalate hydrate.
    • The crystal morphology suggests formation within a tetragonal system.
    • The precise origin and formation pathway of weddellite within this sialolith require further investigation.

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