This code system http://hl7.org/fhir/FDI-surface defines the following codes:

CodeDisplayDefinition
MMesialThe surface of a tooth that is closest to the midline (middle) of the face.
OOcclusalThe chewing surface of posterior teeth.
IIncisalThe biting edge of anterior teeth.
DDistalThe surface of a tooth that faces away from the midline of the face.
BBuccalThe surface of a posterior tooth facing the cheeks.
VVentralThe surface of a tooth facing the lips.
LLingualThe surface of a tooth facing the tongue.
MOMesioclusalThe Mesioclusal surfaces of a tooth.
DODistoclusalThe Distoclusal surfaces of a tooth.
DIDistoincisalThe Distoincisal surfaces of a tooth.
MODMesioclusodistalThe Mesioclusodistal surfaces of a tooth.

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