Abstract
An assembled type original model was devised for the fine-line-reproducibility test of impressions. It consisted of a brass base and six stainless steel blocks assembled on it. Lines of exactly desired widths could be readily made by cutting one line on each of the blocks separately by using a scratch hardness tester with varying load. Six blocks of any series of different line widths could be assembled depending on the purpose of test. With this equipment, the limit of fine line reproducibility of an impression material on stone models can be readily determined.
