Non-transitory computer-readable medium and index value calculation apparatus

An index value calculation apparatus comprising:

• at least one memory that is configured to store instructions;
• and
• at least one processor that is configured to execute the instructions to:
• acquire intraoral three-dimensional data that represents a tooth of a subject person and periodontium of the tooth;
• and
• calculate a gingival state index value of the subject person, an alveolar bone resorption index value of the subject person, or both thereof as a state index value of the subject person by using the intraoral three-dimensional data,
• wherein the gingival state index value of the subject person is an index value related to a state of a gingival of the subject person,
• wherein the alveolar bone resorption index value of the subject person is an index value related to resorption of an alveolar bone of the subject person, and
• wherein the state index value is an index value related to a state of teeth of the subject person.