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Knowledge-based systems, removable partial denture design and the development of RaPiD.

Knowledge-based systems (KBS), otherwise and formerly known as 'expert systems', are computer programs that contain a representation of knowledge that can be used to solve problems normally requiring human intelligence. This article discusses the contributions such systems can make to medicine and dentistry, indicates the range of existing dental KBSs and gives reasons why removable partial denture (RPD) design has attracted so much attention in this respect. A description is also given of the 'RaPiD' system for designing RPDs at the chairside.