Odontoma

Epidemiology:

• Most common type of odontogenic tumour
• Children
• Teenagers

Common sites:

Gross features:

• miniature teeth may be present (compound odontoma)

Histologic features:

• mixture of soft and hard material
• extensive depositions of enamel and dentin
• dentin looks like bone, but has many parallel tubules running through it, quite close together.
• Enamel matrix looks fishscales
• remnants of cells that make the above
• pulp is loose connective tissue with a peripheral layer which makes the dentin next to it
• lined by odontoblasts – columnar cells
• reduced enamel epithelium
• 2 layers of columnar cells

Immunophenotype:

Marker:

Sensitivity:

Specificity:

Molecular features:

Other features:

• hamartomas probably
• usually presents as non-erupting tooth à radiograph
• usually gets in the way of an erupting tooth
• cured by local excision

References:

• Robbins 2005
• Mod Surg Path 2003