Bones are a vital educational material in anatomy classes. However, it is not always easy to provide bones in sufficient quantity for a full class. In this article an easy method is presented for duplicating bones by using thermoplastic impression material and polymer cast material which can be used in anatomy laboratories with minimum cost. The method may be used to duplicate any bones, including rare anthropological bones or models made from materials like plaster or clay. Duplication of a mandible is described as an example. © 1995 Informa UK Ltd All rights reserved: reproduction in whole or part not permitted.