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Histories and Versions for Multimedia Complex Objects

This paper describes the design and implementation of an expert system for use by students in orthodontics in studying cases. The system is based on a relational database system from which knowledge about past diagnoses and treatments is retrieved. Because of the very long period of treatment (e.g. two to ten years), the diagnosis logic has not yet been established in orthodontics. Therefore, an instruction system based on a knowledge/data base is essential.