Dentoform dating from the 1920's is a cut away view and practice model for fillings and procedures. The main half consists of a full teeth set that is removable via small set screws. You can see various teeth that have gold filling procedures and others that are prepped. The other quarter model is made of metal and has prep work for fillings. Excellent pieces and both are marked by Columbia Dentoform along with the dentist name etched on the pieces.