dexsy2 a dental expert system for diagnosis and treatment

dexsy2 is a dental expert system, which diagnoses oral diseases and offers a treatment course. the system which is designed and implemented from scratch is capable of diagnosing among thirty five oral diseases and offering a course of treatment for each. it uses a decision tree for its representation of knowledge, and each of its nodes contains a frame. the knowledge base of the system contains a tree for diagnosing the diseases, a tree for its drug treatment, and a set of signs used in the diagnosis and treatment. reasoning in the system is based on a forward chaining and depth-first search of the tree. it takes into consideration the uncertainties involved and avoids asking repetitive questions. dexsy2 also diagnoses a combination of diseases. it also provides various explanations for its decisions.