Abstract: A dowel pin is mainly made of the hard plastics and is substantially composed of a head to be implanted in the tooth model (primary plaster) and a pin body, a major portion of which is supported in the denture model (secondary plaster), and the pin body is frusto-concial, bar like or plate of moderate tapering, having one or both sides which are flat by grinding, and is provided with a passage at its center vertically running overall length from the head. A modefication has an auxiliary foot for checking rotation of the tooth model. Another modefication has wings on an upper portion of the pin body for concurrently removing the adjacent and plural teeth models from the denture model at once. Distinguishing of the head and the pin body is not essential.