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Table 2 Summary of number of classes used in the OHD

From: Structuring, reuse and analysis of electronic dental data using the Oral Health and Disease Ontology

Ontology Number of Classes
Foundational Model of Anatomy 1515
Oral Health and Disease Ontology 192
Current Dental Terminology codes 174
Ontology for General Medical Science 74
Basic Formal Ontology 32
Information Artifact Ontology 14
Ontology for Biomedical Investigations 13
Common Anatomy Reference Ontology 3
Ontology of Medically Related Social Entities 3
NCBI Taxon 1
Total 1947