[Measurement of the three dimensional shape about crown with the digital speckle correlation method]

It is the first step that the data about relative teeth's shape are catched for CAD/CAM system in dental rehabilitation.That is how to measure the teeth's shape.The digtal speckle correlation method are introduced to measure the teeth's shape in the article.For one posterior tooth,we measured the five surfaces that the occlusal surface and the four axial surfaces.According to some special marks,we changed the five group's local data into one coordinate and reconstructed the three dimensional shape of the tooth.At last we drew the graph with the computer.In this paper the author also discussed some factors about the measure system's sensitive and precise and the extent scale.etc.